#VU122865 Use-after-free in Linux kernel - CVE-2026-23209
Published: February 16, 2026
Vulnerability identifier: #VU122865
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23209
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the macvlan_common_newlink() function in drivers/net/macvlan.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's repository.
External links
- https://git.kernel.org/stable/c/11ba9f0dc865136174cb98834280fb21bbc950c7
- https://git.kernel.org/stable/c/5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a
- https://git.kernel.org/stable/c/986967a162142710076782d5b93daab93a892980
- https://git.kernel.org/stable/c/c43d0e787cbba569ec9d11579ed370b50fab6c9c
- https://git.kernel.org/stable/c/cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66
- https://git.kernel.org/stable/c/da5c6b8ae47e414be47e5e04def15b25d5c962dc
- https://git.kernel.org/stable/c/f8db6475a83649689c087a8f52486fcc53e627e9