SB2026021649 - Use-after-free in Linux kernel net driver
Published: February 16, 2026
Security Bulletin ID
SB2026021649
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-23209)
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 website.
References
- 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