Use-after-free in Linux kernel - CVE-2026-90079
Published: September 19, 2026
Vulnerability identifier: #VU151400
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90079
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to use-after-free in the CN20K mailbox teardown logic when an AF-VF mailbox initialization failure occurs after AF-PF mailbox setup. A local privileged user can trigger an AF-VF mailbox initialization failure to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90079
Install security update from vendor's repository.