Integer overflow in Linux kernel - CVE-2026-90246

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

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/465946d3c560c0137e6a180ba054dddc4d049f5a
• https://git.kernel.org/stable/c/ef79a405f83993f0fda5efde371d98433f7d7a47

• Integer overflow in Linux kernel apparmor
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more