CVE-2026-31749 (GCVE-0-2026-31749)
Vulnerability from cvelistv5
Published
2026-05-01 14:14
Modified
2026-05-01 14:14
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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`.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a Version: 2323b276308a5da5774b778f39c7fd94b2a3022a |
||
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"versions": [
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.253",
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},
{
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"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.168",
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},
{
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"status": "unaffected",
"version": "6.6.134",
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{
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"version": "6.12.81",
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{
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"status": "unaffected",
"version": "6.18.22",
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"version": "7.0",
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}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: ni_atmio16d: Fix invalid clean-up after failed attach\n\nIf the driver\u0027s COMEDI \"attach\" handler function (`atmio16d_attach()`)\nreturns an error, the COMEDI core will call the driver\u0027s \"detach\"\nhandler function (`atmio16d_detach()`) to clean up. This calls\n`reset_atmio16d()` unconditionally, but depending on where the error\noccurred in the attach handler, the device may not have been\nsufficiently initialized to call `reset_atmio16d()`. It uses\n`dev-\u003eiobase` as the I/O port base address and `dev-\u003eprivate` as the\npointer to the COMEDI device\u0027s private data structure. `dev-\u003eiobase`\nmay still be set to its initial value of 0, which would result in\nundesired writes to low I/O port addresses. `dev-\u003eprivate` may still be\n`NULL`, which would result in null pointer dereferences.\n\nFix `atmio16d_detach()` by checking that `dev-\u003eprivate` is valid\n(non-null) before calling `reset_atmio16d()`. This implies that\n`dev-\u003eiobase` was set correctly since that is set up before\n`dev-\u003eprivate`."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-01T14:14:42.227Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a01dd339ea6ac58b0967a50085622a6017351140"
},
{
"url": "https://git.kernel.org/stable/c/933a2d6a95f9bfb203e562c9be1dd990c735535c"
},
{
"url": "https://git.kernel.org/stable/c/5d8d88c8c0eec230de8f1f60e0920a4337939a88"
},
{
"url": "https://git.kernel.org/stable/c/f517646e008fe99ca1800601cd011b110f8684ae"
},
{
"url": "https://git.kernel.org/stable/c/3848ae00b1642e2c98ff8cbfd2d3b38c6f53b5c3"
},
{
"url": "https://git.kernel.org/stable/c/43c68a2c7cc35b7c2a83c285cb4ad3d472b8caa2"
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{
"url": "https://git.kernel.org/stable/c/d07d97ca4f7fac467cdcf4a012690853958b7e89"
},
{
"url": "https://git.kernel.org/stable/c/101ab946b79ad83b36d5cfd47de587492a80acf0"
}
],
"title": "comedi: ni_atmio16d: Fix invalid clean-up after failed attach",
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31749",
"datePublished": "2026-05-01T14:14:42.227Z",
"dateReserved": "2026-03-09T15:48:24.139Z",
"dateUpdated": "2026-05-01T14:14:42.227Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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