Use-after-free in Linux kernel - CVE-2026-46280
Published: June 10, 2026
Vulnerability identifier: #VU134252
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-2026-46280
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 use-after-free in dmirror_devmem_fault() and dmirror_fops_release() in lib/test_hmm.c when handling faults on stale device private pages after file close. A local user can trigger a subsequent fault on those pages to cause a denial of service.
This issue was observed when a test failure triggered a coredump that walked VMAs and faulted in stale device private pages.
How to mitigate CVE-2026-46280
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3
- https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0
- https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144
- https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1
- https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239