Improper access control in Linux kernel - CVE-2026-46104
Published: May 29, 2026
Vulnerability identifier: #VU133088
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-46104
CWE-ID: CWE-284
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 bypass SELinux socket permission checks.
The vulnerability exists due to improper access control in sock_has_perm() and nlmsg_sock_has_extended_perms() when handling socket permission checks in stacked LSM configurations. A local user can trigger access checks on a socket with an incorrectly interpreted security blob to bypass SELinux socket permission checks.
The issue occurs when another LSM allocates socket blob storage before SELinux, causing invalid SID and class values to be used in AVC checks.
How to mitigate CVE-2026-46104
Install security update from vendor's repository.