Medium 5.5Published May 1, 2026

CVE-2026-31749comedi: ni_atmio16d: Fix invalid clean-up after failed attach

Updated under an hour ago (Oct 28, 2026, 6:30 AM ET)

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Exploited in the last 30 days

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`.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 2323b276308a5da5774b778f39c7fd94b2a3022a before a01dd339ea6ac58b0967a50085622a6017351140; 2323b276308a5da5774b778f39c7fd94b2a3022a builds before 933a2d6a95f9bfb203e562c9be1dd990c735535c; 2323b276308a5da5774b778f39c7fd94b2a3022a builds before 5d8d88c8c0eec230de8f1f60e0920a4337939a88; from 2323b276308a5da5774b778f39c7fd94b2a3022a before f517646e008fe99ca1800601cd011b110f8684ae; from 2323b276308a5da5774b778f39c7fd94b2a3022a before 3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3; 2323b276308a5da5774b778f39c7fd94b2a3022a builds before 43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2; from 2323b276308a5da5774b778f39c7fd94b2a3022a before d07d97ca4f7fac467cdcf4a012690853958b7e89; 2323b276308a5da5774b778f39c7fd94b2a3022a builds before 101ab946b79ad83b36d5cfd47de587492a80acf0	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.30 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140	patch
https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c	patch
https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88	patch
https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae	patch
https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3	patch
https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2	patch
https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89	patch
https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.