Race condition in Linux kernel - CVE-2026-64079
Published: July 20, 2026
Vulnerability identifier: #VU138560
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64079
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-64079
Install security update from vendor's repository.