ghsa-4v94-f8pq-mj8v
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
cdx: Fix possible UAF error in driver_override_show()
Fixed a possible UAF problem in driver_override_show() in drivers/cdx/cdx.c
This function driver_override_show() is part of DEVICE_ATTR_RW, which includes both driver_override_show() and driver_override_store(). These functions can be executed concurrently in sysfs.
The driver_override_store() function uses driver_set_override() to update the driver_override value, and driver_set_override() internally locks the device (device_lock(dev)). If driver_override_show() reads cdx_dev->driver_override without locking, it could potentially access a freed pointer if driver_override_store() frees the string concurrently. This could lead to printing a kernel address, which is a security risk since DEVICE_ATTR can be read by all users.
Additionally, a similar pattern is used in drivers/amba/bus.c, as well as many other bus drivers, where device_lock() is taken in the show function, and it has been working without issues.
This potential bug was detected by our experimental static analysis tool, which analyzes locking APIs and paired functions to identify data races and atomicity violations.
{
"affected": [],
"aliases": [
"CVE-2025-21915"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-01T16:15:22Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncdx: Fix possible UAF error in driver_override_show()\n\nFixed a possible UAF problem in driver_override_show() in drivers/cdx/cdx.c\n\nThis function driver_override_show() is part of DEVICE_ATTR_RW, which\nincludes both driver_override_show() and driver_override_store().\nThese functions can be executed concurrently in sysfs.\n\nThe driver_override_store() function uses driver_set_override() to\nupdate the driver_override value, and driver_set_override() internally\nlocks the device (device_lock(dev)). If driver_override_show() reads\ncdx_dev-\u003edriver_override without locking, it could potentially access\na freed pointer if driver_override_store() frees the string\nconcurrently. This could lead to printing a kernel address, which is a\nsecurity risk since DEVICE_ATTR can be read by all users.\n\nAdditionally, a similar pattern is used in drivers/amba/bus.c, as well\nas many other bus drivers, where device_lock() is taken in the show\nfunction, and it has been working without issues.\n\nThis potential bug was detected by our experimental static analysis\ntool, which analyzes locking APIs and paired functions to identify\ndata races and atomicity violations.",
"id": "GHSA-4v94-f8pq-mj8v",
"modified": "2025-04-15T18:31:42Z",
"published": "2025-04-01T18:30:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21915"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0439d541aa8d3444ad41c39e39eb71acb57acde3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8473135f89c0949436a22adb05b8cece2fb3da91"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/91d44c1afc61a2fec37a9c7a3485368309391e0b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d7b339bbc887bcfc1a5b620bfc70c6fbb8f733bf"
}
],
"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 |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- 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.