Integer overflow in Linux kernel - CVE-2026-90246
Published: September 18, 2026
Vulnerability identifier: #VU151240
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90246
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read out-of-bounds memory.
The vulnerability exists due to an integer overflow in the verify_tags() bounds check in AppArmor policy unpacking when loading a crafted policy blob. A local user can load a crafted AppArmor policy to read out-of-bounds memory.
With the default unprivileged_userns_apparmor_policy=1 setting, the policy-loading path is reachable from an unprivileged task in a matched-level nested user namespace.
Affected software
Linux kernel
How to mitigate CVE-2026-90246
Install security update from vendor's repository.