CVE-2026-89762 Linux Kernel AppArmor - Use After Free

Linux kernel AppArmor contains a use-after-free vulnerability caused by improper cred replacement in begin_current_label_crit_section(), letting attackers cause UAF via out-of-sync credentials during LSM hooks, exploit requires specific task cred override conditions.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the AppArmor fix for cred UAF in begin_current_label_crit_section().

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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