CVE-2026-63820 (GCVE-0-2026-63820)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-08-17 04:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix missing read bio submission on large folio error f2fs_read_data_large_folio() can keep a read bio across multiple readahead folios. If a later folio hits an error before any of its blocks are added to the bio, folio_in_bio is false and the current error path returns immediately after ending that folio. This can leave the bio accumulated for earlier folios unsubmitted. Those folios then never receive read completion, and readers can wait indefinitely on the locked folios. Route errors through the common out path so any pending bio is submitted before returning. Stop consuming more readahead folios once an error is seen, and only wait on and clear the current folio when it was actually added to the bio.
References
Impacted products
Vendor Product Version
Linux Linux Version: a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd
Version: a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "48c92559e7b66fdc3cbc74f6e152e66ec0150a0a",
              "status": "affected",
              "version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd",
              "versionType": "git"
            },
            {
              "lessThan": "74c8d2ec95c59a5651ecd975c466998af1961fd4",
              "status": "affected",
              "version": "a5d8b9d94e1863f3ebb7182c238b2c713f6f4efd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix missing read bio submission on large folio error\n\nf2fs_read_data_large_folio() can keep a read bio across multiple\nreadahead folios.  If a later folio hits an error before any of its\nblocks are added to the bio, folio_in_bio is false and the current error\npath returns immediately after ending that folio.\n\nThis can leave the bio accumulated for earlier folios unsubmitted.  Those\nfolios then never receive read completion, and readers can wait\nindefinitely on the locked folios.\n\nRoute errors through the common out path so any pending bio is submitted\nbefore returning.  Stop consuming more readahead folios once an error is\nseen, and only wait on and clear the current folio when it was actually\nadded to the bio."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:27.881Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/48c92559e7b66fdc3cbc74f6e152e66ec0150a0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/74c8d2ec95c59a5651ecd975c466998af1961fd4"
        }
      ],
      "title": "f2fs: fix missing read bio submission on large folio error",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63820",
    "datePublished": "2026-07-19T12:02:18.211Z",
    "dateReserved": "2026-07-19T07:54:57.014Z",
    "dateUpdated": "2026-08-17T04:51:27.881Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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