Vulnerability-Lookup

BDU:2024-04566 (CVE-2021-47520)

Vulnerability from fstec – Published: 2024-06-17 – Updated: 2024-06-17 – View on bdu.fstec.ru Fixed

Title

Уязвимость функции pch_can_rx_normal() драйвера Controller Area Network (CAN) ядра операционной системы Linux, позволяющая нарушителю оказать воздействие на конфиденциальность, целостность и доступность защищаемой информации

Summary

Уязвимость функции pch_can_rx_normal() в модуле drivers/net/can/pch_can.c драйвера Controller Area Network (CAN) ядра операционной системы Linux связана с повторным использованием ранее освобожденной памяти. Эксплуатация уязвимости может позволить нарушителю оказать воздействие на конфиденциальность, целостность и доступность защищаемой информации

Severity

6.8 (Medium) CVSS 2.0


                      
                        AV:L/AC:L/Au:S/C:C/I:C/A:C

7.8 (High) CVSS 3.0


                      
                        CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Class

Code vulnerability

Status

Confirmed by the vendor

Exploitation

Data structure manipulation

Incidents

Being clarified

Remediation

Software update

CWE

CWE-416 - Использование после освобождения

Aliases

CVE-2021-47520

References

18 references

URL
https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3
https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e
https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7
https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d
https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76
https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db
https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa
https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4
https://www.cve.org/CVERecord?id=CVE-2021-47520
https://lore.kernel.org/linux-cve-announce/2024052433-CVE-2021-47520-af45@gregkh/
https://git.kernel.org/linus/94cddf1e9227a171b27292509d59691819c458db
https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.295
https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.293
https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.258
https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221
https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165
https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85
https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8

Impacted products

1 product from 1 vendor

Vendors

Сообщество свободного программного обеспечения

Products

Linux

Versions

от 4.0 до 4.4.294 включительно (Linux), от 4.5 до 4.9.292 включительно (Linux), от 4.10 до 4.14.257 включительно (Linux), от 4.15 до 4.19.220 включительно (Linux), от 4.20 до 5.4.164 включительно (Linux), от 5.5 до 5.10.84 включительно (Linux), от 5.11 до 5.15.7 включительно (Linux)

Product types

Operating system

Platforms

Сообщество свободного программного обеспечения Linux от 4.0 до 4.4.294 включительно, Сообщество свободного программного обеспечения Linux от 4.5 до 4.9.292 включительно, Сообщество свободного программного обеспечения Linux от 4.10 до 4.14.257 включительно, Сообщество свободного программного обеспечения Linux от 4.15 до 4.19.220 включительно, Сообщество свободного программного обеспечения Linux от 4.20 до 5.4.164 включительно, Сообщество свободного программного обеспечения Linux от 5.5 до 5.10.84 включительно, Сообщество свободного программного обеспечения Linux от 5.11 до 5.15.7 включительно

Mitigations

Использование рекомендаций: Для Linux: https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3 https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7 https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76 https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4 https://lore.kernel.org/linux-cve-announce/2024052433-CVE-2021-47520-af45@gregkh/ https://git.kernel.org/linus/94cddf1e9227a171b27292509d59691819c458db https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.295 https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.293 https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.258 https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221 https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165 https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85 https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8

JSON

To clipboard

{
  "CVSS 2.0": "AV:L/AC:L/Au:S/C:C/I:C/A:C",
  "CVSS 3.0": "AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "\u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "\u043e\u0442 4.0 \u0434\u043e 4.4.294 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 4.5 \u0434\u043e 4.9.292 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 4.10 \u0434\u043e 4.14.257 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 4.15 \u0434\u043e 4.19.220 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 4.20 \u0434\u043e 5.4.164 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 5.5 \u0434\u043e 5.10.84 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux), \u043e\u0442 5.11 \u0434\u043e 5.15.7 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0439:\n\u0414\u043b\u044f Linux:\nhttps://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3\nhttps://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e\nhttps://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7\nhttps://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d\nhttps://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76\nhttps://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db\nhttps://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa\nhttps://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4\nhttps://lore.kernel.org/linux-cve-announce/2024052433-CVE-2021-47520-af45@gregkh/\nhttps://git.kernel.org/linus/94cddf1e9227a171b27292509d59691819c458db\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.295\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.293\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.258\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "07.12.2021",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "17.06.2024",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "17.06.2024",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2024-04566",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2021-47520",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "Linux",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": "\u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.0 \u0434\u043e 4.4.294 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.5 \u0434\u043e 4.9.292 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.10 \u0434\u043e 4.14.257 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.15 \u0434\u043e 4.19.220 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 4.20 \u0434\u043e 5.4.164 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 5.5 \u0434\u043e 5.10.84 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e , \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 5.11 \u0434\u043e 5.15.7 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e ",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 pch_can_rx_normal() \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430 Controller Area Network (CAN) \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u043e\u043a\u0430\u0437\u0430\u0442\u044c \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u043d\u0430 \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u044c \u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0441\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u043e\u0441\u043b\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0438\u044f (CWE-416)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 pch_can_rx_normal() \u0432 \u043c\u043e\u0434\u0443\u043b\u0435 drivers/net/can/pch_can.c \u0434\u0440\u0430\u0439\u0432\u0435\u0440\u0430 Controller Area Network (CAN) \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u044b\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0440\u0430\u043d\u0435\u0435 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u043e\u043a\u0430\u0437\u0430\u0442\u044c \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u043d\u0430 \u043a\u043e\u043d\u0444\u0438\u0434\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u044c \u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0441\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u041c\u0430\u043d\u0438\u043f\u0443\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3\nhttps://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e\nhttps://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7\nhttps://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d\nhttps://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76\nhttps://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db\nhttps://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa\nhttps://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4\nhttps://www.cve.org/CVERecord?id=CVE-2021-47520\nhttps://lore.kernel.org/linux-cve-announce/2024052433-CVE-2021-47520-af45@gregkh/\nhttps://git.kernel.org/linus/94cddf1e9227a171b27292509d59691819c458db\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.295\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.293\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.258\nhttps://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.221\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.165\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-416",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 6,8)\n\u0412\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 7,8)"
}

CVE-2021-47520 (GCVE-0-2021-47520)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-08-05 08:48

Title

can: pch_can: pch_can_rx_normal: fix use after free

Summary

In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-17 18:03 UTC

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/bafe343a885c70ddd…
https://git.kernel.org/stable/c/3a3c46e2eff057745…
https://git.kernel.org/stable/c/affbad02bf80380a7…
https://git.kernel.org/stable/c/3e193ef4e0a3f5bf9…
https://git.kernel.org/stable/c/abb4eff3dcd2e5830…
https://git.kernel.org/stable/c/703dde112021c93d6…
https://git.kernel.org/stable/c/6c73fc931658d8cbc…
https://git.kernel.org/stable/c/94cddf1e9227a171b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < bafe343a885c70dddf358379cf0b2a1c07355d8d (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 3a3c46e2eff0577454860a203be1a8295f4acb76 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < affbad02bf80380a7403885b9fe4a1587d1bb4f3 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < abb4eff3dcd2e583060082a18a8dbf31f02689d4 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 703dde112021c93d6e89443c070e7dbd4dea612e (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 6c73fc931658d8cbc8a1714b326cb31eb71d16a7 (git) Affected: b21d18b51b31a24d17f883b678432fbdee3d5675 , < 94cddf1e9227a171b27292509d59691819c458db (git)
Linux	Linux	Affected: 2.6.37 Unaffected: 0 , < 2.6.37 (semver) Unaffected: 4.4.295 , ≤ 4.4.* (semver) Unaffected: 4.9.293 , ≤ 4.9.* (semver) Unaffected: 4.14.258 , ≤ 4.14.* (semver) Unaffected: 4.19.221 , ≤ 4.19.* (semver) Unaffected: 5.4.165 , ≤ 5.4.* (semver) Unaffected: 5.10.85 , ≤ 5.10.* (semver) Unaffected: 5.15.8 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix)

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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: pch_can: pch_can_rx_normal: fix use after free\n\nAfter calling netif_receive_skb(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is dereferenced\njust after the call netif_receive_skb(skb).\n\nReordering the lines solves the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The UAF is in the pch_can hardware RX path (PCI interrupt \u2192 NAPI \u2192 pch_can_rx_normal), triggered by Classical CAN frames arriving on the shared CAN bus; like Bluetooth/WiFi this is limited to the same physical bus segment, not Internet-routable.\nAC:L - Any received frame reliably hits the bug: can_receive() always consume_skb()s the original skb after delivery, so cf (aliasing skb data) is always dangling when cf-\u003elen is read; the attacker fully controls frame injection on the bus.\nPR:N - Exploitation requires only the ability to inject unauthenticated CAN frames onto the bus attached to the EG20T PCH controller; no local account or capability on the victim Linux system is needed.\nUI:N - No victim action is required beyond the CAN interface already being operational and receiving, which is the normal deployed state for this controller.\nS:U - Impact is confined to the local kernel\u0027s networking/stats path; there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - This is a use-after-free of skb/can_frame memory after netif_receive_skb; UAF of freed heap objects can be leveraged for information disclosure (including via the cf-\u003elen read into observable rx_bytes stats).\nI:H - Use-after-free of the skb backing store enables heap reuse/spray primitives that can be escalated to integrity compromise and control-flow hijacking under standard kernel UAF exploitation models.\nA:H - The deterministic UAF on every RX frame can cause kernel oops/panic (e.g. under KASAN or when the reclaimed page is unmapped), fully disrupting the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:48:14.519Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76"
        },
        {
          "url": "https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db"
        }
      ],
      "title": "can: pch_can: pch_can_rx_normal: fix use after free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47520",
    "datePublished": "2024-05-24T15:09:33.796Z",
    "dateReserved": "2024-05-24T15:02:54.824Z",
    "dateUpdated": "2026-08-05T08:48:14.519Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

BDU:2024-04566 (CVE-2021-47520)

CVE-2021-47520 (GCVE-0-2021-47520)

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