{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74512",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74512"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "audit: fix potential use-after-free in audit_del_rule()",
  "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->rule.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->rule.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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74512"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/93616c567469510b7bba55b2674e0c4523fd7e64"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3f82927b399d7a276c0c12b6ff4424b747a0c9a7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ae135a8962be9d4e8a131eb18eb06cdf02a47ce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45bf3df5b32e5a49953e7ceabc55f7dd85380e46"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/78bde7e9bd36eaae1b8e8cfcd47f12a34f301dbf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cae0dfed5d307b240bff71c3cf206652d1b6f215"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b8f46864f06d6dbacb7dcea52bc084dfd122638"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/246df90b5f1a8a6e6abbd2f058b029558720adec"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Reachable only via local NETLINK_AUDIT (AUDIT_DEL_RULE) or filesystem events that autoremove AUDIT_EXE rules; concurrent UAF readers run in syscall/io_uring exit audit filtering on the local host, not from remote network input.\nAC:L - The attacker controls both sides of the race by deleting an AUDIT_EXE rule (auditctl or deleting/moving the audited executable) while driving concurrent syscall/io_uring activity to keep RCU readers in audit_filter()/audit_filter_rules().\nPR:L - Besides CAP_AUDIT_CONTROL netlink deletion, unprivileged local users can trigger audit_del_rule() via fsnotify autoremove when deleting/moving an admin-configured audited executable they can write, without init-namespace root.\nUI:N - Exploitation requires no victim interaction; the attacker schedules rule deletion and concurrent audited syscalls/io_uring exits to hit the UAF window.\nS:U - Impact is kernel heap memory corruption and local privilege escalation within the host kernel security domain, not a documented cross-VM or IOMMU boundary escape.\nC:H - Use-after-free of audit_fsnotify_mark while audit_exe_compare()/audit_mark_compare() dereference mark->ino/dev enables arbitrary kernel memory reads and info disclosure primitives.\nI:H - Freed fsnotify mark objects can be reallocated and corrupted to obtain arbitrary kernel writes, control-flow hijack, and local root code execution beyond audit rule deletion.\nA:H - Concurrent dereference of a freed audit_fsnotify_mark during audit filtering can immediately oops/panic the kernel; repeated triggering yields reliable denial of service."
    }
  }
}