{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53816", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-08T23:58:35.277Z", "datePublished": "2025-12-09T00:01:14.166Z", "dateUpdated": "2026-08-05T09:16:10.458Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:16:10.458Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix potential kgd_mem UAFs\n\nkgd_mem pointers returned by kfd_process_device_translate_handle are\nonly guaranteed to be valid while p->mutex is held. As soon as the mutex\nis unlocked, another thread can free the BO." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is reached through ioctls (AMDKFD_IOC_MAP_MEMORY_TO_GPU / UNMAP_MEMORY_FROM_GPU raced against FREE_MEMORY_OF_GPU) on the /dev/kfd character device, requiring local access to the system. There is no network or remote-peer input path into kfd_chardev.c.\nAC:L - The attacker controls both sides of the race entirely — two threads of their own process issuing concurrent ioctls — and can set the user-supplied args->n_success equal to n_devices to skip the mapping loop so the concurrent free is not rejected with -EBUSY. The window is further made near-deterministic because the victim thread blocks on mutex_lock(&mem->lock) which the freeing thread holds, so it is woken onto memory that has already been mutex_destroy()'d and kfree()'d.\nPR:L - The map/unmap/free memory ioctls are defined with flags 0 — no capability check whatsoever; the only requirement is an open fd on /dev/kfd, which distro/ROCm udev rules grant to ordinary local users (mode 0666, render/video group, or uaccess for the seat user) on any AMD GPU workstation or GPU-compute node. No root, CAP_SYS_ADMIN, or CAP_CHECKPOINT_RESTORE is needed.\nUI:N - The attacker's own process performs all steps (allocate BO, then race map/unmap against free) with no action by any other user. No victim interaction is involved.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. Standard local kernel privilege escalation stays Unchanged.\nC:H - The freed kgd_mem lives in a generic kmalloc cache and can be resprayed with attacker-controlled data, after which amdgpu_sync_clone() walks mem->sync.fences and dereferences attacker-supplied pointers, giving an arbitrary kernel-memory read primitive and, via full control-flow hijack, disclosure of all kernel memory.\nI:H - The UAF yields writes into the freed slab (mutex_lock owner field, dma_fence_get refcount increments at attacker-chosen addresses) and an indirect call through a forged dma_fence_ops->signaled/->wait pointer, which is a control-flow hijack primitive enabling arbitrary kernel code execution and privilege escalation.\nA:H - Even without successful exploitation, operating on a kfree()'d object with a mutex_destroy()'d lock and walking its stale fence hashtable reliably produces kernel oopses/panics, and the attacker can trigger it repeatedly at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c" ], "versions": [ { "version": "4a488a7ad71401169cecee75dc94bcce642e2c53", "lessThan": "5045360f3bb62ccd4f87202e33489f71f8bbc3fc", "status": "affected", "versionType": "git" }, { "version": "4a488a7ad71401169cecee75dc94bcce642e2c53", "lessThan": "5ca14fb5552ac13a2402d306c0bd2379a71610ff", "status": "affected", "versionType": "git" }, { "version": "4a488a7ad71401169cecee75dc94bcce642e2c53", "lessThan": "9da050b0d9e04439d225a2ec3044af70cdfb3933", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c" ], "versions": [ { "version": "3.19", "status": "affected" }, { "version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.23", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.10", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.2.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5045360f3bb62ccd4f87202e33489f71f8bbc3fc" }, { "url": "https://git.kernel.org/stable/c/5ca14fb5552ac13a2402d306c0bd2379a71610ff" }, { "url": "https://git.kernel.org/stable/c/9da050b0d9e04439d225a2ec3044af70cdfb3933" } ], "title": "drm/amdkfd: fix potential kgd_mem UAFs", "x_generator": { "engine": "bippy-1.2.0" } } } }