Vulnerability-Lookup

CNVD-2021-43550

Vulnerability from cnvd - Published: 2021-06-16

Title

Linux kernel释放后重用漏洞（CNVD-2021-43550）

Description

Linux kernel是一种计算机操作系统内核，以C语言和汇编语言写成，符合POSIX标准，按GNU通用公共许可证发行。 Linux kernel 5.10-rc1之前版本中的kernel/trace/ring_buffer.c存在释放后重用漏洞。该漏洞源于在不同cpu上并行运行的cpu缓冲区的trace_open和resize存在竞争条件。攻击者可利用该漏洞导致拒绝服务。

Severity

中

Patch Name

Linux kernel释放后重用漏洞（CNVD-2021-43550）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-27825

Impacted products

Name
Linux Linux kernel <5.10-rc1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-27825",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-27825"
    }
  },
  "description": "Linux kernel\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u4ee5C\u8bed\u8a00\u548c\u6c47\u7f16\u8bed\u8a00\u5199\u6210\uff0c\u7b26\u5408POSIX\u6807\u51c6\uff0c\u6309GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\u53d1\u884c\u3002\n\nLinux kernel 5.10-rc1\u4e4b\u524d\u7248\u672c\u4e2d\u7684kernel/trace/ring_buffer.c\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u4e0d\u540ccpu\u4e0a\u5e76\u884c\u8fd0\u884c\u7684cpu\u7f13\u51b2\u533a\u7684trace_open\u548cresize\u5b58\u5728\u7ade\u4e89\u6761\u4ef6\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bbeb97464eefc65f506084fd9f18f21653e01137",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-43550",
  "openTime": "2021-06-16",
  "patchDescription": "Linux kernel\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\uff0c\u4ee5C\u8bed\u8a00\u548c\u6c47\u7f16\u8bed\u8a00\u5199\u6210\uff0c\u7b26\u5408POSIX\u6807\u51c6\uff0c\u6309GNU\u901a\u7528\u516c\u5171\u8bb8\u53ef\u8bc1\u53d1\u884c\u3002\r\n\r\nLinux kernel 5.10-rc1\u4e4b\u524d\u7248\u672c\u4e2d\u7684kernel/trace/ring_buffer.c\u5b58\u5728\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u4e0d\u540ccpu\u4e0a\u5e76\u884c\u8fd0\u884c\u7684cpu\u7f13\u51b2\u533a\u7684trace_open\u548cresize\u5b58\u5728\u7ade\u4e89\u6761\u4ef6\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Linux kernel\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff08CNVD-2021-43550\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Linux kernel \u003c5.10-rc1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-27825",
  "serverity": "\u4e2d",
  "submitTime": "2020-12-14",
  "title": "Linux kernel\u91ca\u653e\u540e\u91cd\u7528\u6f0f\u6d1e\uff08CNVD-2021-43550\uff09"
}

CVE-2020-27825 (GCVE-0-2020-27825)

Vulnerability from cvelistv5 – Published: 2020-12-11 17:13 – Updated: 2024-08-04 16:25

Summary

A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel (before 5.10-rc1). There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (DOS). This flaw could even allow a local attacker with special user privilege to a kernel information leak threat.

Severity

No CVSS data available.

CWE

CWE-362 - >CWE-416

Assigner

redhat redhat root Scorecard

References

5 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1905155	x_refsource_MISC
https://www.debian.org/security/2021/dsa-4843	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://security.netapp.com/advisory/ntap-2021052…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	kernel	Affected: before kernel 5.10-rc1

Show details on NVD website

JSON

To clipboard

{
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T16:25:43.895Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1905155"
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            "name": "DSA-4843",
            "tags": [
              "vendor-advisory",
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              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2021/dsa-4843"
          },
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            "name": "[debian-lts-announce] 20210212 [SECURITY] [DLA 2557-1] linux-4.19 security update",
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            "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html"
          },
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            "name": "[debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update",
            "tags": [
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            "url": "https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html"
          },
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            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210521-0008/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kernel",
          "vendor": "n/a",
          "versions": [
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            }
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        }
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          "name": "DSA-4843",
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          ],
          "url": "https://www.debian.org/security/2021/dsa-4843"
        },
        {
          "name": "[debian-lts-announce] 20210212 [SECURITY] [DLA 2557-1] linux-4.19 security update",
          "tags": [
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          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html"
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          "url": "https://security.netapp.com/advisory/ntap-20210521-0008/"
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              "url": "https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html"
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    "datePublished": "2020-12-11T17:13:31.000Z",
    "dateReserved": "2020-10-27T00:00:00.000Z",
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

CNVD-2021-43550

CVE-2020-27825 (GCVE-0-2020-27825)

Tags

Sightings

Nomenclature

Related by attack behaviour