CVE-2026-63878 (GCVE-0-2026-63878)
Vulnerability from cvelistv5
Published
2026-07-19 14:54
Modified
2026-07-19 14:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO kvcalloc(args->num_entries, sizeof(*vm_entries), GFP_KERNEL) at amdgpu_gem.c:1050 uses the user-supplied num_entries directly without any upper bounds check. Since num_entries is a __u32 and sizeof(drm_amdgpu_gem_vm_entry) is 32 bytes, a large num_entries produces an allocation exceeding INT_MAX, triggering WARNING in __kvmalloc_node_noprof(), causing a kernel WARNING, TAINT_WARN, and panic on CONFIG_PANIC_ON_WARN=y systems. Add a size bounds check before we invoke the kvzalloc() to reject oversized num_entries early with -EINVAL. (cherry picked from commit 1fe7bf5457f6efd7be60b17e23163ba54341d73d)
References
Impacted products
Vendor Product Version
Linux Linux Version: 4d82724f7f2b847eb0454b1aab5450545b39abd4
Version: 4d82724f7f2b847eb0454b1aab5450545b39abd4
Version: 4d82724f7f2b847eb0454b1aab5450545b39abd4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f059b4c493df3e54fe3ffe4658009c31864275da",
              "status": "affected",
              "version": "4d82724f7f2b847eb0454b1aab5450545b39abd4",
              "versionType": "git"
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            {
              "lessThan": "967a00b8e06a7734aded23861faba9ee2462be87",
              "status": "affected",
              "version": "4d82724f7f2b847eb0454b1aab5450545b39abd4",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "4d82724f7f2b847eb0454b1aab5450545b39abd4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO\n\nkvcalloc(args-\u003enum_entries, sizeof(*vm_entries), GFP_KERNEL) at\namdgpu_gem.c:1050 uses the user-supplied num_entries directly without\nany upper bounds check. Since num_entries is a __u32 and\nsizeof(drm_amdgpu_gem_vm_entry) is 32 bytes, a large num_entries\nproduces an allocation exceeding INT_MAX, triggering\nWARNING in __kvmalloc_node_noprof(), causing a kernel WARNING,\nTAINT_WARN, and panic on CONFIG_PANIC_ON_WARN=y systems.\n\nAdd a size bounds check before we invoke the kvzalloc() to\nreject oversized num_entries early with -EINVAL.\n\n(cherry picked from commit 1fe7bf5457f6efd7be60b17e23163ba54341d73d)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:54:50.977Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f059b4c493df3e54fe3ffe4658009c31864275da"
        },
        {
          "url": "https://git.kernel.org/stable/c/967a00b8e06a7734aded23861faba9ee2462be87"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1ba4594232c87c3b8defd6f89a2e40f8b08395d"
        }
      ],
      "title": "drm/amdgpu: check num_entries in GEM_OP GET_MAPPING_INFO",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63878",
    "datePublished": "2026-07-19T14:54:50.977Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
    "dateUpdated": "2026-07-19T14:54:50.977Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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