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GHSA-73JM-MGRC-FG99

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

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

audit: fix exe mark UAF in kill_rules()

kill_rules() removes mixed AUDIT_DIR and AUDIT_EXE rules when an audit tree is pruned. It drops entry->rule.exe before removing the rule from the RCU-visible filter lists.

After a rule has been installed with AUDIT_ADD_RULE, which requires CAP_AUDIT_CONTROL, removing the watched directory can race with another task that is still evaluating the rule. In that case, fsnotify can free the executable mark before the reader reaches audit_mark_compare(), causing a use-after-free.

KASAN reports:

BUG: KASAN: slab-use-after-free in audit_mark_compare+0x8d/0xa0

Unlink the published rules from the RCU-visible lists and retain them on tree->rules for cleanup. If any rule has an executable mark, wait for a single RCU grace period before removing the marks and scheduling the entries for freeing. Otherwise, call_rcu() already provides the required deferred freeing without a synchronous wait.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98862"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:40Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naudit: fix exe mark UAF in kill_rules()\n\nkill_rules() removes mixed AUDIT_DIR and AUDIT_EXE rules when an audit\ntree is pruned. It drops entry-\u003erule.exe before removing the rule from\nthe RCU-visible filter lists.\n\nAfter a rule has been installed with AUDIT_ADD_RULE, which requires\nCAP_AUDIT_CONTROL, removing the watched directory can race with another\ntask that is still evaluating the rule. In that case, fsnotify can free\nthe executable mark before the reader reaches audit_mark_compare(),\ncausing a use-after-free.\n\nKASAN reports:\n\n    BUG: KASAN: slab-use-after-free in audit_mark_compare+0x8d/0xa0\n\nUnlink the published rules from the RCU-visible lists and retain them\non tree-\u003erules for cleanup. If any rule has an executable mark, wait for\na single RCU grace period before removing the marks and scheduling the\nentries for freeing. Otherwise, call_rcu() already provides the required\ndeferred freeing without a synchronous wait.",
  "id": "GHSA-73jm-mgrc-fg99",
  "modified": "2026-10-18T18:32:06Z",
  "published": "2026-10-18T18:32:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/304960900991157e6883bdf0b39782b690545ee8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88633025f20ba9c32ccdb3efc86eafdf98cb825c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa650d87a498844060eecb1d336f4d46f4d1b0b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2cc5462b78559c7628a9f8ac9a9592e7783183a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98862 (GCVE-0-2026-98862)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-19 09:26

Title

audit: fix exe mark UAF in kill_rules()

Summary

In the Linux kernel, the following vulnerability has been resolved: audit: fix exe mark UAF in kill_rules() kill_rules() removes mixed AUDIT_DIR and AUDIT_EXE rules when an audit tree is pruned. It drops entry->rule.exe before removing the rule from the RCU-visible filter lists. After a rule has been installed with AUDIT_ADD_RULE, which requires CAP_AUDIT_CONTROL, removing the watched directory can race with another task that is still evaluating the rule. In that case, fsnotify can free the executable mark before the reader reaches audit_mark_compare(), causing a use-after-free. KASAN reports: BUG: KASAN: slab-use-after-free in audit_mark_compare+0x8d/0xa0 Unlink the published rules from the RCU-visible lists and retain them on tree->rules for cleanup. If any rule has an executable mark, wait for a single RCU grace period before removing the marks and scheduling the entries for freeing. Otherwise, call_rcu() already provides the required deferred freeing without a synchronous wait.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6996 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/304960900991157e6…
https://git.kernel.org/stable/c/88633025f20ba9c32…
https://git.kernel.org/stable/c/f2cc5462b78559c76…
https://git.kernel.org/stable/c/aa650d87a49884406…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 304960900991157e6883bdf0b39782b690545ee8 (git) Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < 88633025f20ba9c32ccdb3efc86eafdf98cb825c (git) Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < f2cc5462b78559c7628a9f8ac9a9592e7783183a (git) Affected: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc , < aa650d87a498844060eecb1d336f4d46f4d1b0b3 (git)
Linux	Linux	Affected: 4.3 Unaffected: 0 , < 4.3 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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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.

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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.
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