CVE-2023-53816 (GCVE-0-2023-53816)
Vulnerability from cvelistv5
Published
2025-12-09 00:01
Modified
2026-08-05 09:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix potential kgd_mem UAFs kgd_mem pointers returned by kfd_process_device_translate_handle are only guaranteed to be valid while p->mutex is held. As soon as the mutex is unlocked, another thread can free the BO.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4a488a7ad71401169cecee75dc94bcce642e2c53
Version: 4a488a7ad71401169cecee75dc94bcce642e2c53
Version: 4a488a7ad71401169cecee75dc94bcce642e2c53
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5045360f3bb62ccd4f87202e33489f71f8bbc3fc",
              "status": "affected",
              "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
              "versionType": "git"
            },
            {
              "lessThan": "5ca14fb5552ac13a2402d306c0bd2379a71610ff",
              "status": "affected",
              "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
              "versionType": "git"
            },
            {
              "lessThan": "9da050b0d9e04439d225a2ec3044af70cdfb3933",
              "status": "affected",
              "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.19"
            },
            {
              "lessThan": "3.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.23",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.10",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "3.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003emutex is held. As soon as the mutex\nis unlocked, another thread can free the BO."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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 \u2014 two threads of their own process issuing concurrent ioctls \u2014 and can set the user-supplied args-\u003en_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(\u0026mem-\u003elock) which the freeing thread holds, so it is woken onto memory that has already been mutex_destroy()\u0027d and kfree()\u0027d.\nPR:L - The map/unmap/free memory ioctls are defined with flags 0 \u2014 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\u0027s 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-\u003esync.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-\u003esignaled/-\u003ewait 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()\u0027d object with a mutex_destroy()\u0027d lock and walking its stale fence hashtable reliably produces kernel oopses/panics, and the attacker can trigger it repeatedly at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:10.458Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53816",
    "datePublished": "2025-12-09T00:01:14.166Z",
    "dateReserved": "2025-12-08T23:58:35.277Z",
    "dateUpdated": "2026-08-05T09:16:10.458Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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