GHSA-QQ4H-F4QP-WR7Q
Vulnerability from github – Published: 2025-05-02 18:31 – Updated: 2025-11-12 21:31In the Linux kernel, the following vulnerability has been resolved:
drm/ttm: Fix a NULL pointer dereference
The LRU mechanism may look up a resource in the process of being removed from an object. The locking rules here are a bit unclear but it looks currently like res->bo assignment is protected by the LRU lock, whereas bo->resource is protected by the object lock, while clearing of bo->resource is also protected by the LRU lock. This means that if we check that bo->resource points to the LRU resource under the LRU lock we should be safe. So perform that check before deciding to swap out a bo. That avoids dereferencing a NULL bo->resource in ttm_bo_swapout().
{
"affected": [],
"aliases": [
"CVE-2023-53095"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-02T16:15:28Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/ttm: Fix a NULL pointer dereference\n\nThe LRU mechanism may look up a resource in the process of being removed\nfrom an object. The locking rules here are a bit unclear but it looks\ncurrently like res-\u003ebo assignment is protected by the LRU lock, whereas\nbo-\u003eresource is protected by the object lock, while *clearing* of\nbo-\u003eresource is also protected by the LRU lock. This means that if\nwe check that bo-\u003eresource points to the LRU resource under the LRU\nlock we should be safe.\nSo perform that check before deciding to swap out a bo. That avoids\ndereferencing a NULL bo-\u003eresource in ttm_bo_swapout().",
"id": "GHSA-qq4h-f4qp-wr7q",
"modified": "2025-11-12T21:31:01Z",
"published": "2025-05-02T18:31:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53095"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9a9a8fe26751334b7739193a94eba741073b8a55"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d9b1f9f7a72d83ebf173534e76b246349f32374"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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