SB2026100789 - Use-after-free in Linux kernel core
Published: October 7, 2026
Security Bulletin ID
SB2026100789
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98276)
CWE-ID: CWE-416 - Use After Free
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 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.
Remediation
Install update from vendor's website.
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