SB2026041409 - Improper access control in Linux kernel netfilter
Published: April 14, 2026
Security Bulletin ID
SB2026041409
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2026-31424)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper access control in xt_check_match/xt_check_target extension validation in x_tables when processing ARP chains through nft_compat. A local user can load a match or target with incompatible hook assumptions to cause a denial of service.
The issue can result in a NULL pointer dereference and kernel panic when extensions registered with NFPROTO_UNSPEC are used on ARP hooks with different semantics.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1cd6313c8644bfebbd813a05da9daa21b09dd68c
- https://git.kernel.org/stable/c/3d5d488f11776738deab9da336038add95d342d1
- https://git.kernel.org/stable/c/3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a
- https://git.kernel.org/stable/c/dc3e27dd7d76e21106b8f9bbdc31f5da74a89014
- https://git.kernel.org/stable/c/e7e1b6bcb389c8708003d40613a59ff2496f6b1f
- https://git.kernel.org/stable/c/f00ac65c90ea475719e08d629e2e26c8b4e6999b