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🛡️ CVE-2026-31749 — kernel

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

Description

comedi: ni_atmio16d: Fix invalid clean-up after failed attach

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

comedi: ni_atmio16d: Fix invalid clean-up after failed attach

If the driver's COMEDI "attach" handler function (atmio16d_attach())

returns an error, the COMEDI core will call the driver's "detach"

handler function (atmio16d_detach()) to clean up. This calls

reset_atmio16d() unconditionally, but depending on where the error

occurred in the attach handler, the device may not have been

sufficiently initialized to call reset_atmio16d(). It uses

dev->iobase as the I/O port base address and dev->private as the

pointer to the COMEDI device's private data structure. dev->iobase

may still be set to its initial value of 0, which would result in

undesired writes to low I/O port addresses. dev->private may still be

NULL, which would result in null pointer dereferences.

Fix atmio16d_detach() by checking that dev->private is valid

(non-null) before calling reset_atmio16d(). This implies that

dev->iobase was set correctly since that is set up before

dev->private.

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-2026-31749 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.12)
  • linux-kernel

Timeline and source

Published on 1 May 2026 and last revised on 15 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)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31749 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 2026-05-01
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.12
linux-kernel — —

References

Similar Threats

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