Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-46254
Published: June 4, 2026
Vulnerability identifier: #VU133336
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46254
CWE-ID: CWE-703
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of unaligned memory access in AppArmor dfa table unpacking in security/apparmor/match.c when parsing a crafted AppArmor dfa blob. A local user can supply a specially crafted policy blob to trigger unaligned memory access and cause a denial of service.
The issue can be triggered by dfa tables originating from userspace, and it affects architectures that fault on unaligned memory accesses.
How to mitigate CVE-2026-46254
Install security update from vendor's repository.