GHSA-4248-7W5J-8G9P

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

audit: fix potential use-after-free in audit_del_rule()

audit_del_rule() destroys e->rule.exe via audit_remove_mark_rule() before unlinking the rule from RCU-visible filter lists and waiting for a grace period. Concurrent readers in audit_filter() and audit_filter_rules() still dereference e->rule.exe, while the fsnotify mark can be freed on an independent lifetime path. This creates a use-after-free window during rule deletion.

Fix this by unlinking the rule from the RCU-visible lists and invoking synchronize_rcu() before calling audit_remove_mark_rule() (and other rule removal helpers). This ensures that all existing RCU readers have exited the critical section before any underlying resources are destroyed.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74512"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:56Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: fix potential use-after-free in audit_del_rule()\n\n`audit_del_rule()` destroys `e-\u003erule.exe` via `audit_remove_mark_rule()`\nbefore unlinking the rule from RCU-visible filter lists and waiting for a\ngrace period. Concurrent readers in `audit_filter()` and\n`audit_filter_rules()` still dereference `e-\u003erule.exe`, while the fsnotify\nmark can be freed on an independent lifetime path. This creates a\nuse-after-free window during rule deletion.\n\nFix this by unlinking the rule from the RCU-visible lists and invoking\n`synchronize_rcu()` before calling `audit_remove_mark_rule()` (and other\nrule removal helpers). This ensures that all existing RCU readers have\nexited the critical section before any underlying resources are destroyed.",
  "id": "GHSA-4248-7w5j-8g9p",
  "modified": "2026-08-19T18:32:29Z",
  "published": "2026-08-15T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/246df90b5f1a8a6e6abbd2f058b029558720adec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f82927b399d7a276c0c12b6ff4424b747a0c9a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45bf3df5b32e5a49953e7ceabc55f7dd85380e46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b8f46864f06d6dbacb7dcea52bc084dfd122638"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ae135a8962be9d4e8a131eb18eb06cdf02a47ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93616c567469510b7bba55b2674e0c4523fd7e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cae0dfed5d307b240bff71c3cf206652d1b6f215"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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