Use-after-free in Linux kernel - CVE-2026-89669
Published: September 12, 2026
Vulnerability identifier: #VU149135
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89669
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger a use-after-free condition.
The vulnerability exists due to a use-after-free in copy-notify state initialization when racing a crafted OFFLOAD_CANCEL request against COPY_NOTIFY processing. A remote attacker can send a crafted OFFLOAD_CANCEL request to trigger a use-after-free condition.
Exploitation requires a matching client ID and a guessable state object ID.
Affected software
Linux kernel
How to mitigate CVE-2026-89669
Install security update from vendor's repository.