CVE-2021-47254 (GCVE-0-2021-47254)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2026-05-23 15:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6948c6bc17d666663a84c124b3176039e64a58f4
Version: b568ed385a18c0ddbe41862b69088b636550a04f
Version: 762bb3528249604bc680a9df635e8995740176de
Version: bac8520892812dada1ac93f27d96317470d24b1f
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 7881ef3f33bb80f459ea6020d1e021fc524a6348
Version: 1e7a416fb765c9072479dc424780c0937ba99270
Version: dcbdbe13796ffa561510d2686a6318564e728bbd
Version: 4.4.181   ≤
Version: 4.9.180   ≤
Version: 4.14.123   ≤
Version: 4.19.47   ≤
Version: 5.0.20   ≤
Version: 5.1.6   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47254",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-17T17:37:55.520472Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-17T17:39:42.605Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.867Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/gfs2/glock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "38ce329534500bf4ae71f81df6a37a406cf187b4",
              "status": "affected",
              "version": "6948c6bc17d666663a84c124b3176039e64a58f4",
              "versionType": "git"
            },
            {
              "lessThan": "92869945cc5b78ee8a1ef90336fe070893e3458a",
              "status": "affected",
              "version": "b568ed385a18c0ddbe41862b69088b636550a04f",
              "versionType": "git"
            },
            {
              "lessThan": "0364742decb0f02bc183404868b82896f7992595",
              "status": "affected",
              "version": "762bb3528249604bc680a9df635e8995740176de",
              "versionType": "git"
            },
            {
              "lessThan": "094bf5670e762afa243d2c41a5c4ab71c7447bf4",
              "status": "affected",
              "version": "bac8520892812dada1ac93f27d96317470d24b1f",
              "versionType": "git"
            },
            {
              "lessThan": "86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d",
              "status": "affected",
              "version": "7881ef3f33bb80f459ea6020d1e021fc524a6348",
              "versionType": "git"
            },
            {
              "lessThan": "a61156314b66456ab6a291ed5deba1ebd002ab3c",
              "status": "affected",
              "version": "7881ef3f33bb80f459ea6020d1e021fc524a6348",
              "versionType": "git"
            },
            {
              "lessThan": "e87ef30fe73e7e10d2c85bdcc778dcec24dca553",
              "status": "affected",
              "version": "7881ef3f33bb80f459ea6020d1e021fc524a6348",
              "versionType": "git"
            },
            {
              "lessThan": "1ab19c5de4c537ec0d9b21020395a5b5a6c059b2",
              "status": "affected",
              "version": "7881ef3f33bb80f459ea6020d1e021fc524a6348",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e7a416fb765c9072479dc424780c0937ba99270",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dcbdbe13796ffa561510d2686a6318564e728bbd",
              "versionType": "git"
            },
            {
              "lessThan": "4.4.274",
              "status": "affected",
              "version": "4.4.181",
              "versionType": "semver"
            },
            {
              "lessThan": "4.9.274",
              "status": "affected",
              "version": "4.9.180",
              "versionType": "semver"
            },
            {
              "lessThan": "4.14.238",
              "status": "affected",
              "version": "4.14.123",
              "versionType": "semver"
            },
            {
              "lessThan": "4.19.196",
              "status": "affected",
              "version": "4.19.47",
              "versionType": "semver"
            },
            {
              "lessThan": "5.1",
              "status": "affected",
              "version": "5.0.20",
              "versionType": "semver"
            },
            {
              "lessThan": "5.2",
              "status": "affected",
              "version": "5.1.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/gfs2/glock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.274",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.274",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.238",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.127",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.12",
              "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": "4.4.274",
                  "versionStartIncluding": "4.4.181",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.274",
                  "versionStartIncluding": "4.9.180",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.238",
                  "versionStartIncluding": "4.14.123",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.196",
                  "versionStartIncluding": "4.19.47",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.127",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.45",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.12",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.0.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.1.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix use-after-free in gfs2_glock_shrink_scan\n\nThe GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to\nremove the glock from the lru list in __gfs2_glock_put().\n\nOn the shrink scan path, the same flag is cleared under lru_lock but because\nof cond_resched_lock(\u0026lru_lock) in gfs2_dispose_glock_lru(), progress on the\nput side can be made without deleting the glock from the lru list.\n\nKeep GLF_LRU across the race window opened by cond_resched_lock(\u0026lru_lock) to\nensure correct behavior on both sides - clear GLF_LRU after list_del under\nlru_lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:19:36.037Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a"
        },
        {
          "url": "https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595"
        },
        {
          "url": "https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4"
        },
        {
          "url": "https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2"
        }
      ],
      "title": "gfs2: Fix use-after-free in gfs2_glock_shrink_scan",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47254",
    "datePublished": "2024-05-21T14:19:49.475Z",
    "dateReserved": "2024-04-10T18:59:19.539Z",
    "dateUpdated": "2026-05-23T15:19:36.037Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.