CVE-2025-21842 (GCVE-0-2025-21842)
Vulnerability from cvelistv5
Published
2025-03-07 09:10
Modified
2026-08-05 11:54
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: amdkfd: properly free gang_ctx_bo when failed to init user queue The destructor of a gtt bo is declared as void amdgpu_amdkfd_free_gtt_mem(struct amdgpu_device *adev, void **mem_obj); Which takes void** as the second parameter. GCC allows passing void* to the function because void* can be implicitly casted to any other types, so it can pass compiling. However, passing this void* parameter into the function's execution process(which expects void** and dereferencing void**) will result in errors.
References
Impacted products
Vendor Product Version
Linux Linux Version: fb91065851cd5f2735348c5f3eddeeca3d7c2973
Version: fb91065851cd5f2735348c5f3eddeeca3d7c2973
Version: fb91065851cd5f2735348c5f3eddeeca3d7c2973
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae5ab1c1ae504f622cc1ff48830a9ed48428146d",
              "status": "affected",
              "version": "fb91065851cd5f2735348c5f3eddeeca3d7c2973",
              "versionType": "git"
            },
            {
              "lessThan": "091a68c58c1bbd2ab7d05d1b32c1306394ec691d",
              "status": "affected",
              "version": "fb91065851cd5f2735348c5f3eddeeca3d7c2973",
              "versionType": "git"
            },
            {
              "lessThan": "a33f7f9660705fb2ecf3467b2c48965564f392ce",
              "status": "affected",
              "version": "fb91065851cd5f2735348c5f3eddeeca3d7c2973",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.16",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\namdkfd: properly free gang_ctx_bo when failed to init user queue\n\nThe destructor of a gtt bo is declared as\nvoid amdgpu_amdkfd_free_gtt_mem(struct amdgpu_device *adev, void **mem_obj);\nWhich takes void** as the second parameter.\n\nGCC allows passing void* to the function because void* can be implicitly\ncasted to any other types, so it can pass compiling.\n\nHowever, passing this void* parameter into the function\u0027s\nexecution process(which expects void** and dereferencing void**)\nwill result in errors."
        }
      ],
      "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 the AMDKFD_IOC_CREATE_QUEUE ioctl on the local /dev/kfd character device; there is no network vector.\nAC:L - The attacker controls the trigger \u2014 supplying a wptr buffer allocated on a different GPU deterministically hits the device-mismatch error path on multi-GPU systems, or GART/pin exhaustion forces the map failure; no uncontrollable condition is required.\nPR:L - The create-queue ioctl carries flags=0 with no capability check, so any unprivileged local user with render-group access to /dev/kfd (typical on desktops/workstations) can reach it.\nUI:N - Exploitation is a direct ioctl sequence from the attacker\u0027s own process with no victim action required.\nS:U - The invalid dereference and any resulting corruption occur within the kernel\u0027s own security authority; no privilege/isolation boundary such as a VM or IOMMU domain is crossed.\nC:H - This pointer-vs-pointer-to-pointer type confusion dereferences a fixed userspace-mappable address (0x200000002); on non-SMAP/PAN or nosmap systems the attacker can back that address with a crafted fake amdgpu_bo, yielding attacker-controlled kernel reads.\nI:H - The same crafted-object primitive feeds amdgpu_bo unpin/unref, which perform refcount decrements and destructor dispatch on the attacker-controlled structure, enabling kernel memory corruption and potential control-flow hijack.\nA:H - On the common case (SMAP enabled) the wild dereference of 0x200000002 faults immediately, producing a kernel oops/panic and denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:54:51.838Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae5ab1c1ae504f622cc1ff48830a9ed48428146d"
        },
        {
          "url": "https://git.kernel.org/stable/c/091a68c58c1bbd2ab7d05d1b32c1306394ec691d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a33f7f9660705fb2ecf3467b2c48965564f392ce"
        }
      ],
      "title": "amdkfd: properly free gang_ctx_bo when failed to init user queue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21842",
    "datePublished": "2025-03-07T09:10:00.298Z",
    "dateReserved": "2024-12-29T08:45:45.777Z",
    "dateUpdated": "2026-08-05T11:54:51.838Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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