GHSA-JX84-VRFM-C347
Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-03 18:31In the Linux kernel, the following vulnerability has been resolved:
comedi: pcl726: Prevent invalid irq number
The reproducer passed in an irq number(0x80008000) that was too large, which triggered the oob.
Added an interrupt number check to prevent users from passing in an irq number that was too large.
If it->options[1] is 31, then 1 << it->options[1] is still invalid
because it shifts a 1-bit into the sign bit (which is UB in C).
Possible solutions include reducing the upper bound on the
it->options[1] value to 30 or lower, or using 1U << it->options[1].
The old code would just not attempt to request the IRQ if the
options[1] value were invalid. And it would still configure the
device without interrupts even if the call to request_irq returned an
error. So it would be better to combine this test with the test below.
{
"affected": [],
"aliases": [
"CVE-2025-39685"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-05T18:15:45Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl726: Prevent invalid irq number\n\nThe reproducer passed in an irq number(0x80008000) that was too large,\nwhich triggered the oob.\n\nAdded an interrupt number check to prevent users from passing in an irq\nnumber that was too large.\n\nIf `it-\u003eoptions[1]` is 31, then `1 \u003c\u003c it-\u003eoptions[1]` is still invalid\nbecause it shifts a 1-bit into the sign bit (which is UB in C).\nPossible solutions include reducing the upper bound on the\n`it-\u003eoptions[1]` value to 30 or lower, or using `1U \u003c\u003c it-\u003eoptions[1]`.\n\nThe old code would just not attempt to request the IRQ if the\n`options[1]` value were invalid. And it would still configure the\ndevice without interrupts even if the call to `request_irq` returned an\nerror. So it would be better to combine this test with the test below.",
"id": "GHSA-jx84-vrfm-c347",
"modified": "2025-11-03T18:31:39Z",
"published": "2025-09-05T18:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39685"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0eb4ed2aa261dee228f1668dbfa6d87353e8162d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5a33d07c94ba91306093e823112a7aa9727549f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/96cb948408b3adb69df7e451ba7da9d21f814d00"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bab220b0bb5af652007e278e8e8357f952b0e1ea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d8992c9a01f81128f36acb7c5755530e21fcd059"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.