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

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Summary

CVECVE-2026-31749
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:37 UTC
Updated2026-05-07 19:18:34 UTC
DescriptionIn 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`.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a a01dd339ea6ac58b0967a50085622a6017351140 git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a 933a2d6a95f9bfb203e562c9be1dd990c735535c git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a 5d8d88c8c0eec230de8f1f60e0920a4337939a88 git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a f517646e008fe99ca1800601cd011b110f8684ae git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a 3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3 git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a 43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2 git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a d07d97ca4f7fac467cdcf4a012690853958b7e89 git Not specified
CNA Linux Linux affected 2323b276308a5da5774b778f39c7fd94b2a3022a 101ab946b79ad83b36d5cfd47de587492a80acf0 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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