Use-after-free in Linux kernel - CVE-2026-80841
Published: September 5, 2026
Vulnerability identifier: #VU147079
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-2026-80841
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 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.
Affected software
Linux kernel
How to mitigate CVE-2026-80841
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3