CVE-2026-90231 Linux Kernel - Privilege Escalation

Linux kernel contains a privilege escalation caused by improper enforcement of unconfined user namespace restrictions in AppArmor stack transitions, letting unprivileged users escape confinement, exploit requires two transitions through an unconfined profile.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the AppArmor fix applied.

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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