SB20260905110 - Use-after-free in Linux kernel packet
Published: September 5, 2026
Security Bulletin ID
SB20260905110
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-2026-80841)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in AF_PACKET TX_RING handling when closing a socket or replacing a transmit ring while transmit skbs remain pending. A local user can close a socket or replace a transmit ring while transmit skbs remain pending to cause a denial of service.
The issue is limited to vmalloc-backed transmit-ring blocks.
Remediation
Install update from vendor's website.