{"id":"CVE-2023-53095","title":"drm/ttm: Fix a NULL pointer dereference","summary":"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 uncle…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f","Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9d9b1f9f7a72d83ebf173534e76b246349f32374","Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9a9a8fe26751334b7739193a94eba741073b8a55","Linux 5.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:17:06.340946Z"},"published":"2025-05-02","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:21:00.619Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53095","references":[{"url":"https://git.kernel.org/stable/c/9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f"},{"url":"https://git.kernel.org/stable/c/9d9b1f9f7a72d83ebf173534e76b246349f32374"},{"url":"https://git.kernel.org/stable/c/9a9a8fe26751334b7739193a94eba741073b8a55"}],"tags":["cve.org"],"epss":0.00199,"epssPercentile":0.09814,"ingestedAt":"2026-11-05T22:38:31.768Z","slug":"CVE-2023-53095","body":"## Overview\n\nIn 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->bo assignment is protected by the LRU lock, whereas\nbo->resource is protected by the object lock, while *clearing* of\nbo->resource is also protected by the LRU lock. This means that if\nwe check that bo->resource 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->resource in ttm_bo_swapout().\n\n## Affected\n\n- `Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9ba1720f6c4a0f13c3f3cb5c28132ee75555d04f`\n- `Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9d9b1f9f7a72d83ebf173534e76b246349f32374`\n- `Linux >= 6a9b028994025f5033f10d1da30b29dfdc713384 < 9a9a8fe26751334b7739193a94eba741073b8a55`\n- `Linux 5.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}