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🛡️ CVE-2026-31689 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

EDAC/mc: Fix error path ordering in edac_mc_alloc()

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

EDAC/mc: Fix error path ordering in edac_mc_alloc()

When the mci->pvt_info allocation in edac_mc_alloc() fails, the error path

will call put_device() which will end up calling the device's release

function.

However, the init ordering is wrong such that device_initialize() happens

*after* the failed allocation and thus the device itself and the release

function pointer are not initialized yet when they're called:

MCE: In-kernel MCE decoding enabled.

------------[ cut here ]------------

kobject: '(null)': is not initialized, yet kobject_put() is being called.

WARNING: lib/kobject.c:734 at kobject_put, CPU#22: systemd-udevd

CPU: 22 UID: 0 PID: 538 Comm: systemd-udevd Not tainted 7.0.0-rc1+ #2 PREEMPT(full)

RIP: 0010:kobject_put

Call Trace:

<TASK>

edac_mc_alloc+0xbe/0xe0 [edac_core]

amd64_edac_init+0x7a4/0xff0 [amd64_edac]

? __pfx_amd64_edac_init+0x10/0x10 [amd64_edac]

do_one_initcall

...

Reorder the calling sequence so that the device is initialized and thus the

release function pointer is properly set before it can be used.

This was found by Claude while reviewing another EDAC patch.

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 none, integrity none, availability high.

Affected software

CVE-2026-31689 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.13)
  • linux-kernel

Timeline and source

Published on 27 April 2026 and last revised on 12 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-2026-31689 on other distributions

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

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-27
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.13
linux-kernel — —

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