Use-after-free in Linux kernel - CVE-2026-80977
Published: September 12, 2026
Vulnerability identifier: #VU149410
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80977
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt memory.
The vulnerability exists due to improper handling of shared zerocopy state in skb_tx_error() when processing cloned socket buffers. A remote attacker can trigger processing of cloned socket buffers to corrupt memory.
The issue can be reached when Open vSwitch processes a non-last OVS_ACTION_ATTR_RECIRC action, the clone encounters a flow miss, and a later local ESP delivery decrypts data in place.
Affected software
Linux kernel
How to mitigate CVE-2026-80977
Install security update from vendor's repository.