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EUVD-2026-320433

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:40

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:40:32.891991+00:00",
  "id": "EUVD-2026-320433"
}

CVE-2023-52886 (GCVE-0-2023-52886)

Vulnerability from cvelistv5 – Published: 2024-07-16 09:40 – Updated: 2026-05-23 15:27

Title

USB: core: Fix race by not overwriting udev->descriptor in hub_port_init()

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix race by not overwriting udev->descriptor in hub_port_init() Syzbot reported an out-of-bounds read in sysfs.c:read_descriptors(): BUG: KASAN: slab-out-of-bounds in read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883 Read of size 8 at addr ffff88801e78b8c8 by task udevd/5011 CPU: 0 PID: 5011 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883 ... Allocated by task 758: ... __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc+0x5e/0x190 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:680 [inline] usb_get_configuration+0x1f7/0x5170 drivers/usb/core/config.c:887 usb_enumerate_device drivers/usb/core/hub.c:2407 [inline] usb_new_device+0x12b0/0x19d0 drivers/usb/core/hub.c:2545 As analyzed by Khazhy Kumykov, the cause of this bug is a race between read_descriptors() and hub_port_init(): The first routine uses a field in udev->descriptor, not expecting it to change, while the second overwrites it. Prior to commit 45bf39f8df7f ("USB: core: Don't hold device lock while reading the "descriptors" sysfs file") this race couldn't occur, because the routines were mutually exclusive thanks to the device locking. Removing that locking from read_descriptors() exposed it to the race. The best way to fix the bug is to keep hub_port_init() from changing udev->descriptor once udev has been initialized and registered. Drivers expect the descriptors stored in the kernel to be immutable; we should not undermine this expectation. In fact, this change should have been made long ago. So now hub_port_init() will take an additional argument, specifying a buffer in which to store the device descriptor it reads. (If udev has not yet been initialized, the buffer pointer will be NULL and then hub_port_init() will store the device descriptor in udev as before.) This eliminates the data race responsible for the out-of-bounds read. The changes to hub_port_init() appear more extensive than they really are, because of indentation changes resulting from an attempt to avoid writing to other parts of the usb_device structure after it has been initialized. Similar changes should be made to the code that reads the BOS descriptor, but that can be handled in a separate patch later on. This patch is sufficient to fix the bug found by syzbot.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 17:00 UTC

Assigner

Linux mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/9d241c5d9a9b7ad95…
https://git.kernel.org/stable/c/7fe9d87996062f5eb…
https://git.kernel.org/stable/c/8186596a663506b11…
https://git.kernel.org/stable/c/b4a074b1fb222164e…
https://git.kernel.org/stable/c/b9fbfb349eacc0820…
https://git.kernel.org/stable/c/ff33299ec8bb80cdc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 218925bfd5d1436e337c4f961e9c149fbe32de6d , < 9d241c5d9a9b7ad95c90c6520272fe404d5ac88f (git) Affected: 77358093331e9769855140bf94a3f00ecdcf4bb1 , < 7fe9d87996062f5eb0ca476ad0257f79bf43aaf5 (git) Affected: c87fb861ec185fdc578b4fdc6a05920b6a843840 , < 8186596a663506b1124bede9fde6f243ef9f37ee (git) Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < b4a074b1fb222164ed7d5c0b8c922dc4a0840848 (git) Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < b9fbfb349eacc0820f91c797d7f0a3ac7a4935b5 (git) Affected: 45bf39f8df7f05efb83b302c65ae3b9bc92b7065 , < ff33299ec8bb80cdcc073ad9c506bd79bb2ed20b (git) Affected: 6badaf880edf51a2da7a439699676394dfdef3e5 (git) Affected: 5f35b5d3bd6914c68f743741443dfd3a64b0e455 (git) Affected: a1e89c8b29d003a20ed2dae6bdae1598d1f23e42 (git) Affected: 1bcb238c54a9c6dc4bded06b06ba7458a5eefa87 (git) Affected: 5.10.171 , < 5.10.195 (semver) Affected: 5.15.97 , < 5.15.132 (semver) Affected: 6.1.15 , < 6.1.53 (semver) Affected: 4.14.308 , < 4.15 (semver) Affected: 4.19.275 , < 4.20 (semver) Affected: 5.4.234 , < 5.5 (semver) Affected: 6.2.2 , < 6.3 (semver)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 5.10.195 , ≤ 5.10.* (semver) Unaffected: 5.15.132 , ≤ 5.15.* (semver) Unaffected: 6.1.53 , ≤ 6.1.* (semver) Unaffected: 6.4.16 , ≤ 6.4.* (semver) Unaffected: 6.5.3 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.
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EUVD-2026-320433

CVE-2023-52886 (GCVE-0-2023-52886)

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