CVE-2026-63812 (GCVE-0-2026-63812)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node() When __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does not reset the length of the largest extent to 0 and update the inode folio. Since modifications to the extent tree are disallowed afterward, the cached largest extent may become stale. This can trigger the following error in xfstests generic/388: F2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix In the f2fs_drop_inode path, __destroy_extent_node() does not need to guarantee that et->node_cnt is 0, because concurrency with writeback is expected in this path, and writeback may update the extent cache. This patch reverts commit ed78aeebef05 ("f2fs: fix node_cnt race between extent node destroy and writeback"), and remove the unnecessary zero check of et->node_cnt.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 42dd1c91f993431d0b399502479d00e6ad1bca71 , < 7e4d8f98be63f98856a5176b9188dada6e7ba9ee (git)
Affected: ab1eaf9d5c99042f5b0243bf67a06283a4c0757f , < 58a5deb220bcac4c73bf58954c0845644c997487 (git)
Affected: b0e4395870eb3441ddc959f6710b5f6ca61aff26 , < 20190e498057997532c7f186d081011f18e0a462 (git)
Affected: ed78aeebef05212ef7dca93bd931e4eff67c113f , < edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7 (git)
Affected: ed78aeebef05212ef7dca93bd931e4eff67c113f , < 1f70ddb28a3c71df124da5fa4040c808116d6bb9 (git)
Affected: 0559a0e962aacbb47519e26ee663be04b72dcb92 (git)
Affected: 6.6.140 , < 6.6.144 (semver)
Affected: 6.12.88 , < 6.12.95 (semver)
Affected: 6.18.30 , < 6.18.38 (semver)
Affected: 7.0.7 , < 7.1 (semver)
Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7e4d8f98be63f98856a5176b9188dada6e7ba9ee",
              "status": "affected",
              "version": "42dd1c91f993431d0b399502479d00e6ad1bca71",
              "versionType": "git"
            },
            {
              "lessThan": "58a5deb220bcac4c73bf58954c0845644c997487",
              "status": "affected",
              "version": "ab1eaf9d5c99042f5b0243bf67a06283a4c0757f",
              "versionType": "git"
            },
            {
              "lessThan": "20190e498057997532c7f186d081011f18e0a462",
              "status": "affected",
              "version": "b0e4395870eb3441ddc959f6710b5f6ca61aff26",
              "versionType": "git"
            },
            {
              "lessThan": "edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7",
              "status": "affected",
              "version": "ed78aeebef05212ef7dca93bd931e4eff67c113f",
              "versionType": "git"
            },
            {
              "lessThan": "1f70ddb28a3c71df124da5fa4040c808116d6bb9",
              "status": "affected",
              "version": "ed78aeebef05212ef7dca93bd931e4eff67c113f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0559a0e962aacbb47519e26ee663be04b72dcb92",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.144",
              "status": "affected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.95",
              "status": "affected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.38",
              "status": "affected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThan": "7.1",
              "status": "affected",
              "version": "7.0.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/extent_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "6.6.140",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "6.12.88",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "6.18.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "7.0.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()\n\nWhen __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does\nnot reset the length of the largest extent to 0 and update the inode\nfolio. Since modifications to the extent tree are disallowed afterward,\nthe cached largest extent may become stale. This can trigger the\nfollowing error in xfstests generic/388:\n\nF2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix\n\nIn the f2fs_drop_inode path, __destroy_extent_node() does not need to\nguarantee that et-\u003enode_cnt is 0, because concurrency with writeback\nis expected in this path, and writeback may update the extent cache.\n\nThis patch reverts commit ed78aeebef05 (\"f2fs: fix node_cnt race between\nextent node destroy and writeback\"), and remove the unnecessary zero\ncheck of et-\u003enode_cnt."
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:19.633Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7e4d8f98be63f98856a5176b9188dada6e7ba9ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/58a5deb220bcac4c73bf58954c0845644c997487"
        },
        {
          "url": "https://git.kernel.org/stable/c/20190e498057997532c7f186d081011f18e0a462"
        },
        {
          "url": "https://git.kernel.org/stable/c/edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f70ddb28a3c71df124da5fa4040c808116d6bb9"
        }
      ],
      "title": "f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63812",
    "datePublished": "2026-07-19T12:02:13.606Z",
    "dateReserved": "2026-07-19T07:54:57.013Z",
    "dateUpdated": "2026-07-20T13:40:19.633Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63812",
      "date": "2026-07-21",
      "epss": "0.0012",
      "percentile": "0.02148"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:46:07.000Z",
      "cve": "CVE-2026-63812",
      "id": "msrc_CVE-2026-63812",
      "initial_release_date": "2026-07-20T01:07:14.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63812.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63812\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:54.137\",\"lastModified\":\"2026-07-20T15:16:47.957\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()\\n\\nWhen __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does\\nnot reset the length of the largest extent to 0 and update the inode\\nfolio. Since modifications to the extent tree are disallowed afterward,\\nthe cached largest extent may become stale. This can trigger the\\nfollowing error in xfstests generic/388:\\n\\nF2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix\\n\\nIn the f2fs_drop_inode path, __destroy_extent_node() does not need to\\nguarantee that et-\u003enode_cnt is 0, because concurrency with writeback\\nis expected in this path, and writeback may update the extent cache.\\n\\nThis patch reverts commit ed78aeebef05 (\\\"f2fs: fix node_cnt race between\\nextent node destroy and writeback\\\"), and remove the unnecessary zero\\ncheck of et-\u003enode_cnt.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/f2fs/extent_cache.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"42dd1c91f993431d0b399502479d00e6ad1bca71\",\"lessThan\":\"7e4d8f98be63f98856a5176b9188dada6e7ba9ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ab1eaf9d5c99042f5b0243bf67a06283a4c0757f\",\"lessThan\":\"58a5deb220bcac4c73bf58954c0845644c997487\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b0e4395870eb3441ddc959f6710b5f6ca61aff26\",\"lessThan\":\"20190e498057997532c7f186d081011f18e0a462\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed78aeebef05212ef7dca93bd931e4eff67c113f\",\"lessThan\":\"edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed78aeebef05212ef7dca93bd931e4eff67c113f\",\"lessThan\":\"1f70ddb28a3c71df124da5fa4040c808116d6bb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0559a0e962aacbb47519e26ee663be04b72dcb92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.6.140\",\"lessThan\":\"6.6.144\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.88\",\"lessThan\":\"6.12.95\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.30\",\"lessThan\":\"6.18.38\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.0.7\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/f2fs/extent_cache.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f70ddb28a3c71df124da5fa4040c808116d6bb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20190e498057997532c7f186d081011f18e0a462\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/58a5deb220bcac4c73bf58954c0845644c997487\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e4d8f98be63f98856a5176b9188dada6e7ba9ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T09:08:08+00:00",
      "cve": "CVE-2026-63812",
      "id": "CVE-2026-63812",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63812.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.