Use-after-free in Linux kernel - CVE-2026-98276
Published: October 7, 2026
Vulnerability identifier: #VU153744
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-98276
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 a use-after-free in sock_gettstamp() in net/core/sock.c when non-atomic socket flag updates race without holding the socket lock. A local user can race a SIOCGSTAMPNS_NEW ioctl with bind() on a UDP socket to cause a denial of service.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98276
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1
External References
- https://git.kernel.org/stable/c/17b2a1eb97fdb2a2cbaeab3b146b26797ea9311f
- https://git.kernel.org/stable/c/18899e2e4023369a8f7739c2255a59a9748d8d17
- https://git.kernel.org/stable/c/1f73253add8365d0dad0a4f421acaa8c21d20cef
- https://git.kernel.org/stable/c/3b12d3967e96f1b7b977d9fc352ae29a1b299a82
- https://git.kernel.org/stable/c/88c804847dd87dc613b771b392ccecdb94725032
- https://git.kernel.org/stable/c/899650bbf985b7bfd2a7b808357df9b16e6d6959
- https://git.kernel.org/stable/c/9ed55f3dbef4f4adfe65eb03b0c35c53229a8490
- https://git.kernel.org/stable/c/d9f96bc2d822501f84d1caa6275a2c6b316ca2c4