SB20260918435 - Expired pointer dereference in Linux kernel netfilter
Published: September 18, 2026
Security Bulletin ID
SB20260918435
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Expired pointer dereference (CVE-ID: CVE-2026-90237)
CWE-ID: CWE-825 - Expired pointer dereference
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to stale list entries in nft_ct custom expectation support when creating custom conntrack expectations for unconfirmed conntracks. A local user can create custom conntrack expectations to cause a denial of service.
Remediation
Install update from vendor's website.