SB2026082451 - Race condition in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-74715)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the BPF conntrack kfuncs when processing a shared map value for the opts argument during conntrack lookup or allocation. A local user can modify opts->netns_id concurrently to trigger an unmatched namespace reference release and cause a denial of service.

Exploitation requires the ability to invoke the affected BPF conntrack kfuncs with an opts argument that can reference a shared map value.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/e5e060eb63d10b41ab60fd955649479d99b38210
• https://git.kernel.org/stable/c/fdeba03fea78407a8c52faa99177c9f7f29f90eb