audit: fix exe mark UAF in kill_rules()
CVSS score
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EPSS probability
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Risk score
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Published
19 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
A use-after-free vulnerability exists in the kill_rules() function of the Linux kernel audit subsystem. A race condition during the removal of a watched directory can lead to the premature freeing of the executable mark by fsnotify and trigger KASAN reports.
This vulnerability can trigger a use-after-free condition leading to memory safety issues and system instability while audit rules are being processed.
What should be done?
- Review the provided kernel fixes
- Follow vendor advisories
- Apply updates that properly handle RCU grace periods
Chain of evidence and sources
kill_rules() fonksiyonu, bir audit tree budandığında karışık kuralları kaldırır ve entry->rule.exe nesnesini RCU görünür listelerinden önce bırakır.
İzlenen dizinin kaldırılması, kuralı değerlendiren başka bir görevle yarışarak audit_mark_compare() çalışmadan önce fsnotify tarafından işaretin serbest bırakılmasına neden olabilir.
Show the technical text from the sources
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.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98862 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98862 weaknesses.
Official Sources and Advisories
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