SB20260424223 - Improper access control in Linux kernel netfilter
Published: April 24, 2026
Security Bulletin ID
SB20260424223
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-31496)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 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]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper access control in nf_conntrack_expect proc handling when reading proc entries. A local user can read expectation entries from other network namespaces to disclose sensitive information.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/168145c87444619e3e649322bbe7719ecd00d411
- https://git.kernel.org/stable/c/2028405ea6987b4448784e439413202cfe19f43f
- https://git.kernel.org/stable/c/3265ad619987cb551edaf797ed056d80ac450225
- https://git.kernel.org/stable/c/3db5647984de03d9cae0dcddb509b058351f0ee4
- https://git.kernel.org/stable/c/9ca8c7452493d915f9bbf2f39331e6c583d07a23
- https://git.kernel.org/stable/c/dcfcd95b3ae7683e8ae55c92284b3430ce614bc7