Use-after-free in Linux kernel - CVE-2026-43370
Published: May 9, 2026
Vulnerability identifier: #VU130805
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-43370
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free race in VM acquire when parent and child processes sharing a drm_file both try to acquire the same VM after fork(). A local user can trigger concurrent VM acquisition to cause a denial of service.
The issue occurs in scenarios involving fork() with shared drm_file state between parent and child processes.
How to mitigate CVE-2026-43370
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/2c1030f2e84885cc58bffef6af67d5b9d2e7098f
- https://git.kernel.org/stable/c/46d309996bd9251792d7dafdbaf615cf202b4447
- https://git.kernel.org/stable/c/7885eb335d8f9e9942925d57e300a85e3f82ded4
- https://git.kernel.org/stable/c/904025fa8bba1d028adade33346372b4ac1a9249
- https://git.kernel.org/stable/c/94b7782d0c8024f5b88454241c8d4777076c3786
- https://git.kernel.org/stable/c/ae87aea330c24f462fc7058ed543ba8bc6798447
- https://git.kernel.org/stable/c/c658c1c85ec235b7ecfbf8dbfee385b1332088f4
- https://git.kernel.org/stable/c/e61e355cbe49e585097eee28c15b862bfb1c0668