Medium [CVE-2026-89761] AppArmor out-of-bounds write allows local denial of service or privilege escalation
This medium-severity Red Hat Linux advisory covers CVE-2026-89761.
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Summary
A flaw was found in the Linux kernel's AppArmor security module. An out-of-bounds write vulnerability exists when null terminating a label vector due to improper memory allocation.
An unprivileged local attacker can exploit this by writing to specific system files, potentially leading to a denial of service (DoS) or, in some cases, privilege escalation. This vulnerability requires an AppArmor policy to be loaded on the system.
Red Hat severity: Important — CVSS 6.5 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H). Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 56 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 56 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 56 minutes ago·verify at source
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