CVE-2021-4460 (GCVE-0-2021-4460)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2026-08-11 02:05
VLAI
Title
drm/amdkfd: Fix UBSAN shift-out-of-bounds warning
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix UBSAN shift-out-of-bounds warning If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up doing a shift operation where the number of bits shifted equals number of bits in the operand. This behaviour is undefined. Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the count is >= number of bits in the operand. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:39 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6856 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 35cdc81bfa94d10373ecae279f3c48ca858ac4fd , < 0c0356ef2498c1a250fe3846f30293f828737309 (git)
Affected: 35cdc81bfa94d10373ecae279f3c48ca858ac4fd , < 1874b0ef1426b873de94c61861e38f29a8df714c (git)
Affected: 35cdc81bfa94d10373ecae279f3c48ca858ac4fd , < 3fdc5182700910a685d23df57d65166e8556a266 (git)
Affected: 35cdc81bfa94d10373ecae279f3c48ca858ac4fd , < 9069b1b542de8f3bbffef868aff41521b21485cf (git)
Affected: 35cdc81bfa94d10373ecae279f3c48ca858ac4fd , < 50e2fc36e72d4ad672032ebf646cecb48656efe0 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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                "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "0c0356ef2498c1a250fe3846f30293f828737309",
                  "status": "affected",
                  "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                  "versionType": "git"
                },
                {
                  "lessThan": "1874b0ef1426b873de94c61861e38f29a8df714c",
                  "status": "affected",
                  "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                  "versionType": "git"
                },
                {
                  "lessThan": "3fdc5182700910a685d23df57d65166e8556a266",
                  "status": "affected",
                  "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                  "versionType": "git"
                },
                {
                  "lessThan": "9069b1b542de8f3bbffef868aff41521b21485cf",
                  "status": "affected",
                  "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                  "versionType": "git"
                },
                {
                  "lessThan": "50e2fc36e72d4ad672032ebf646cecb48656efe0",
                  "status": "affected",
                  "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.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": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.118",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.36",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.11.*",
                  "status": "unaffected",
                  "version": "5.11.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.118",
                      "versionStartIncluding": "3.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.36",
                      "versionStartIncluding": "3.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.11.20",
                      "versionStartIncluding": "3.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.3",
                      "versionStartIncluding": "3.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13",
                      "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 UBSAN shift-out-of-bounds warning\n\nIf get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up\ndoing a shift operation where the number of bits shifted equals\nnumber of bits in the operand. This behaviour is undefined.\n\nSet num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the\ncount is \u003e= number of bits in the operand.\n\nBug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-20T08:50:43.244Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/0c0356ef2498c1a250fe3846f30293f828737309"
            },
            {
              "url": "https://git.kernel.org/stable/c/1874b0ef1426b873de94c61861e38f29a8df714c"
            },
            {
              "url": "https://git.kernel.org/stable/c/3fdc5182700910a685d23df57d65166e8556a266"
            },
            {
              "url": "https://git.kernel.org/stable/c/9069b1b542de8f3bbffef868aff41521b21485cf"
            },
            {
              "url": "https://git.kernel.org/stable/c/50e2fc36e72d4ad672032ebf646cecb48656efe0"
            }
          ],
          "title": "drm/amdkfd: Fix UBSAN shift-out-of-bounds warning",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-4460",
        "datePublished": "2025-10-01T11:45:19.050Z",
        "dateReserved": "2025-10-01T11:38:13.842Z",
        "dateUpdated": "2026-01-14T17:42:45.892Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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