Vulnerability-Lookup

CNVD-2025-03423

Vulnerability from cnvd - Published: 2025-02-21

Title

Linux kernel afs_proc_addr_prefs_write函数拒绝服务漏洞

Description

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在拒绝服务漏洞，该漏洞源于afs_proc_addr_prefs_write函数在参数argc小于0时直接返回，而未释放已持有的inode锁，攻击者可利用该漏洞导致返回用户空间时仍持有锁，可能引发死锁。

Severity

中

Patch Name

Linux kernel afs_proc_addr_prefs_write函数拒绝服务漏洞的补丁

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/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3

Reference

https://nvd.nist.gov/vuln/detail/CVE-2025-21672

Impacted products

Name
Linux Linux kernel <6.12.11

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2025-21672",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2025-21672"
    }
  },
  "description": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\n\nLinux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eafs_proc_addr_prefs_write\u51fd\u6570\u5728\u53c2\u6570argc\u5c0f\u4e8e0\u65f6\u76f4\u63a5\u8fd4\u56de\uff0c\u800c\u672a\u91ca\u653e\u5df2\u6301\u6709\u7684inode\u9501\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u8fd4\u56de\u7528\u6237\u7a7a\u95f4\u65f6\u4ecd\u6301\u6709\u9501\uff0c\u53ef\u80fd\u5f15\u53d1\u6b7b\u9501\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/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2025-03423",
  "openTime": "2025-02-21",
  "patchDescription": "Linux kernel\u662f\u7f8e\u56fdLinux\u57fa\u91d1\u4f1a\u7684\u5f00\u6e90\u64cd\u4f5c\u7cfb\u7edfLinux\u6240\u4f7f\u7528\u7684\u5185\u6838\u3002\r\n\r\nLinux kernel\u5b58\u5728\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eafs_proc_addr_prefs_write\u51fd\u6570\u5728\u53c2\u6570argc\u5c0f\u4e8e0\u65f6\u76f4\u63a5\u8fd4\u56de\uff0c\u800c\u672a\u91ca\u653e\u5df2\u6301\u6709\u7684inode\u9501\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u8fd4\u56de\u7528\u6237\u7a7a\u95f4\u65f6\u4ecd\u6301\u6709\u9501\uff0c\u53ef\u80fd\u5f15\u53d1\u6b7b\u9501\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 afs_proc_addr_prefs_write\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Linux Linux kernel \u003c6.12.11"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2025-21672",
  "serverity": "\u4e2d",
  "submitTime": "2025-02-17",
  "title": "Linux kernel afs_proc_addr_prefs_write\u51fd\u6570\u62d2\u7edd\u670d\u52a1\u6f0f\u6d1e"
}

CVE-2025-21672 (GCVE-0-2025-21672)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-05-11 21:04

Title

afs: Fix merge preference rule failure condition

Summary

In the Linux kernel, the following vulnerability has been resolved: afs: Fix merge preference rule failure condition syzbot reported a lock held when returning to userspace[1]. This is because if argc is less than 0 and the function returns directly, the held inode lock is not released. Fix this by store the error in ret and jump to done to clean up instead of returning directly. [dh: Modified Lizhi Xu's original patch to make it honour the error code from afs_split_string()] [1] WARNING: lock held when returning to user space! 6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted ------------------------------------------------ syz-executor133/5823 is leaving the kernel with locks still held! 1 lock held by syz-executor133/5823: #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #0: ffff888071cffc00 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:52 UTC

CWE

CWE-667 - Improper Locking

Assigner

Linux mitre root Scorecard

References

2 references

URL	Tags
https://git.kernel.org/stable/c/22be1d90a6211c88d…
https://git.kernel.org/stable/c/17a4fde81d3a7478d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f94f70d39cc2d54079ebae934862198516315db2 , < 22be1d90a6211c88dd093b25d1f3aa974d0d9f9d (git) Affected: f94f70d39cc2d54079ebae934862198516315db2 , < 17a4fde81d3a7478d97d15304a6d61094a10c2e3 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.11 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21672",
                "options": [
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                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:52:11.531644Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-667",
                "description": "CWE-667 Improper Locking",
                "lang": "en",
                "type": "CWE"
              }
            ]
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:57:12.173Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "programFiles": [
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          "versions": [
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              "status": "affected",
              "version": "f94f70d39cc2d54079ebae934862198516315db2",
              "versionType": "git"
            },
            {
              "lessThan": "17a4fde81d3a7478d97d15304a6d61094a10c2e3",
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              "version": "f94f70d39cc2d54079ebae934862198516315db2",
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix merge preference rule failure condition\n\nsyzbot reported a lock held when returning to userspace[1].  This is\nbecause if argc is less than 0 and the function returns directly, the held\ninode lock is not released.\n\nFix this by store the error in ret and jump to done to clean up instead of\nreturning directly.\n\n[dh: Modified Lizhi Xu\u0027s original patch to make it honour the error code\nfrom afs_split_string()]\n\n[1]\nWARNING: lock held when returning to user space!\n6.13.0-rc3-syzkaller-00209-g499551201b5f #0 Not tainted\n------------------------------------------------\nsyz-executor133/5823 is leaving the kernel with locks still held!\n1 lock held by syz-executor133/5823:\n #0: ffff888071cffc00 (\u0026sb-\u003es_type-\u003ei_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]\n #0: ffff888071cffc00 (\u0026sb-\u003es_type-\u003ei_mutex_key#9){++++}-{4:4}, at: afs_proc_addr_prefs_write+0x2bb/0x14e0 fs/afs/addr_prefs.c:388"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:04:12.853Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/17a4fde81d3a7478d97d15304a6d61094a10c2e3"
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      ],
      "title": "afs: Fix merge preference rule failure condition",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21672",
    "datePublished": "2025-01-31T11:25:35.246Z",
    "dateReserved": "2024-12-29T08:45:45.736Z",
    "dateUpdated": "2026-05-11T21:04:12.853Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
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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.

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CNVD-2025-03423

CVE-2025-21672 (GCVE-0-2025-21672)

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Nomenclature

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