Use-after-free in Linux kernel - CVE-2026-64424
Published: July 27, 2026
Vulnerability identifier: #VU139519
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-64424
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in netpoll tx_work handling when shutting down netpoll while a pending TX worker runs in parallel with the cleanup path. A local user can trigger netpoll cleanup during concurrent worker execution to cause a denial of service.
The issue occurs because the queued worker can continue running after the associated netpoll data has been freed.
Affected software
Linux kernel
How to mitigate CVE-2026-64424
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3