SB20260720152 - Race condition in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64079)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 leading to a NULL pointer dereference in netfilter x_tables table registration and teardown when registering tables concurrently with per-network namespace exit. A local user can trigger concurrent table registration and namespace cleanup to cause a denial of service.

The issue occurs because a table can become visible in the per-netns list before valid hook operations are assigned, allowing the pre_exit path to pass a NULL ops pointer to hook unregistration.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2f92c5f923979f37ab1d5445381e4b8378a196cc
• https://git.kernel.org/stable/c/b62eb8dcf2c47d4d676a434efbd57c4f776f7829