CVE-2026-90246 Linux Kernel AppArmor - Integer Overflow

Linux kernel AppArmor contains an integer overflow in verify_tags() bounds check caused by 32-bit addition wraparound in tagset validation, letting attackers with CAP_MAC_ADMIN in nested namespaces cause out-of-bounds read, exploit requires CAP_MAC_ADMIN privilege.

CVSS base score 7.1 /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
Integer Overflow
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for verify_tags() integer overflow.

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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