🛡️ CVE-2026-46280 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

lib: test_hmm: evict device pages on file close to avoid use-after-free

In the Linux kernel, the following vulnerability has been resolved:

lib: test_hmm: evict device pages on file close to avoid use-after-free

Patch series "Minor hmm_test fixes and cleanups".

Two bugfixes a cleanup for the HMM kernel selftests. These were mostly

reported by Zenghui Yu with special thanks to Lorenzo for analysing and

pointing out the problems.

This patch (of 3):

When dmirror_fops_release() is called it frees the dmirror struct but

doesn't migrate device private pages back to system memory first. This

leaves those pages with a dangling zone_device_data pointer to the freed

dmirror.

If a subsequent fault occurs on those pages (eg. during coredump) the

dmirror_devmem_fault() callback dereferences the stale pointer causing a

kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64,

where a test failure triggered SIGABRT and the resulting coredump walked

the VMAs faulting in the stale device private pages.

Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in

dmirror_fops_release() to migrate all device private pages back to system

memory before freeing the dmirror struct. The function is moved earlier

in the file to avoid a forward declaration.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-46280 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.4)
  • linux-kernel (from 6.19 up to 7.0.4)
  • unknown

Timeline and source

Published on 8 June 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46280 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-08
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.4
linux-kernel 6.19 7.0.4
unknown — —

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