CVE-2023-53095 (GCVE-0-2023-53095)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2025-05-04 07:49
VLAI?
Title
drm/ttm: Fix a NULL pointer dereference
Summary
In 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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6a9b028994025f5033f10d1da30b29dfdc713384 , < 9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f (git)
Affected: 6a9b028994025f5033f10d1da30b29dfdc713384 , < 9d9b1f9f7a72d83ebf173534e76b246349f32374 (git)
Affected: 6a9b028994025f5033f10d1da30b29dfdc713384 , < 9a9a8fe26751334b7739193a94eba741073b8a55 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.21 , ≤ 6.1.* (semver)
Unaffected: 6.2.8 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/ttm/ttm_device.c"
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              ],
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:49:44.736Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9d9b1f9f7a72d83ebf173534e76b246349f32374"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a9a8fe26751334b7739193a94eba741073b8a55"
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      ],
      "title": "drm/ttm: Fix a NULL pointer dereference",
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    "cveId": "CVE-2023-53095",
    "datePublished": "2025-05-02T15:55:39.661Z",
    "dateReserved": "2025-05-02T15:51:43.552Z",
    "dateUpdated": "2025-05-04T07:49:44.736Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • 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.
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  • 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.



Detection rules are retrieved from Rulezet.