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jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED.

Announced Source revision 1
Original source ↗

CVE-2026-72225

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72225

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "aa90f00932bf572d6ef284c977c2a60b39c13bd6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "e144ad0250f77e23e28949587b8b57e40dc3b512",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "fb9b49618ed7296ebfad62a3835da8945f727001",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "78955fdce8ff654e6d33a2fa90882a1e7eb26330",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "a58fc10adf503969fec2007b5afe8987258046c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6866d7b3f2bb4f011041ba54c98b1584497fe2fd",
        "lessThan": "289a2ca0c9b7eae74f93fc213b0b971669b8683d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/jbd2/journal.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/jbd2/journal.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72225

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32975 · Revision 1
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Publisher date
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