CVE-2026-89762Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's AppArmor security module. The begin_current_label_crit_section() function, used in various Linux Security Module (LSM) hooks, attempts to replace user credentials when a security label becomes stale. …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 5.2
— → 5.2
none → medium
— → 7.8
none → high
7.8 → 5.2
high → medium
5.2 → 7.8
medium → high
7.8 → 5.2
high → medium
Last analysed / modified upstream
5.2 → 5.5
A flaw was found in the Linux kernel's AppArmor security module. The begin_current_label_crit_section() function, used in various Linux Security Module (LSM) hooks, attempts to replace user credentials when a security label becomes stale. This process can lead to a Use-After-Free (UAF) vulnerability if the old credentials are still referenced or if the replacement occurs with overridden credentials. A local attacker could potentially exploit this flaw to achieve privilege escalation or cause a denial of service.
kernel: apparmor: fix cred UAF caused by begin_current_label_crit_section() — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
Not affected:
Refer to the advisory for fix availability.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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