SB2026052787 - Improper input validation in Linux kernel netfilter
Published: May 27, 2026
Security Bulletin ID
SB2026052787
CSH 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 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-46101)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 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
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in nft_bitwise when initializing left and right shift expressions with a zero shift operand. A local user can create a malformed rule to cause a denial of service.
The issue is triggered in the control plane before malformed rules reach the packet path.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/6f820139d16a4c9865a145d4a9cf9c92cc632c14
- https://git.kernel.org/stable/c/bffef0acec9c3b837a785248a893137fb7f26c95
- https://git.kernel.org/stable/c/ca24f1243ad1a4d12d6a23876bbbe3ed02099853
- https://git.kernel.org/stable/c/f370205974f171a5868c13ff30d7642fed46e47b
- https://git.kernel.org/stable/c/fe11e5c40817b84abaa5d83bfb6586d8412bfd07