GHSA-M64M-JWHP-5878
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In the Linux kernel, the following vulnerability has been resolved:
i3c: master: Fix info leak and UAF in device unregister path
i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During device_unregister(), device_del() emits a KOBJ_REMOVE uevent and unbinds the driver while the device descriptor is still expected to be valid. As a result, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct i3c_device_info, leaking kernel stack contents in the generated modalias. Driver .remove() callbacks may also encounter an unexpected NULL desc during unbind.
Keep desc valid until device_unregister() has completed. Since device_unregister() drops the device reference and may free the device, take an extra reference with get_device() before unregistering. Clear desc afterwards and release the extra reference with put_device(). This preserves the release-time invariant that desc must be NULL while avoiding both the information leak and a potential use-after-free from writing desc after the device has been released.
{
"affected": [],
"aliases": [
"CVE-2026-80952"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:00Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: master: Fix info leak and UAF in device unregister path\n\ni3c_master_unregister_i3c_devs() clears i3cdev-\u003edev-\u003edesc before\ncalling device_unregister(). During device_unregister(),\ndevice_del() emits a KOBJ_REMOVE uevent and unbinds the driver while\nthe device descriptor is still expected to be valid. As a result,\ni3c_device_uevent() and a racing modalias_show() can observe a NULL\ndesc and fall back to an uninitialized stack struct i3c_device_info,\nleaking kernel stack contents in the generated modalias. Driver\n.remove() callbacks may also encounter an unexpected NULL desc during\nunbind.\n\nKeep desc valid until device_unregister() has completed. Since\ndevice_unregister() drops the device reference and may free the device,\ntake an extra reference with get_device() before unregistering. Clear\ndesc afterwards and release the extra reference with put_device().\nThis preserves the release-time invariant that desc must be NULL while\navoiding both the information leak and a potential use-after-free from\nwriting desc after the device has been released.",
"id": "GHSA-m64m-jwhp-5878",
"modified": "2026-09-14T15:32:20Z",
"published": "2026-09-11T21:31:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80952"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.