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f2fs: fix data loss caused by incorrect use of nat_entry flag

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix data loss caused by incorrect use of nat_entry flag Data loss can occur when fsync is performed on a newly created file (before any checkpoint has been written) concurrently with a checkpoint operation. The scenario is as follows: create & write & fsync 'file A' write checkpoint - f2fs_do_sync_file // inline inode - f2fs_write_inode // inode folio is dirty - f2fs_write_checkpoint - f2fs_flush_merged_writes - f2fs_sync_node_pages - f2fs_flush_nat_entries - f2fs_fsync_node_pages // no dirty node - f2fs_need_inode_block_update // return false SPO and lost 'file A' f2fs_flush_nat_entries() sets the IS_CHECKPOINTED and HAS_LAST_FSYNC flags for the nat_entry, but this does not mean that the checkpoint has actually completed successfully. However, f2fs_need_inode_block_update() checks these flags and incorrectly assumes that the checkpoint has finished. The root cause is that the semantics of IS_CHECKPOINTED and HAS_LAST_FSYNC are only guaranteed after the checkpoint write fully completes. This patch modifies f2fs_need_inode_block_update() to acquire the sbi->node_write lock before reading the nat_entry flags, ensuring that once IS_CHECKPOINTED and HAS_LAST_FSYNC are observed to be set, the checkpoint operation has already completed.

Announced Source revision 1
Original source ↗

CVE-2026-53017

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-2026-53017

Linux

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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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": "e05df3b115e7308afbca652769b54e4549fcc723",
        "lessThan": "0645fa4d48e9b77d93f8b7a1c1fea58a97c2f8b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e05df3b115e7308afbca652769b54e4549fcc723",
        "lessThan": "9fd3bcb54a6afea5fa8a828d010561143560b7c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e05df3b115e7308afbca652769b54e4549fcc723",
        "lessThan": "cb06a07d835ba1ea250785a796243bb483e65816",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e05df3b115e7308afbca652769b54e4549fcc723",
        "lessThan": "20cedb4d9f6b230d0ee469690b8f868f06a07c29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e05df3b115e7308afbca652769b54e4549fcc723",
        "lessThan": "238e14eb7226f883b72caccd2d37bf5707df066b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/f2fs/node.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/f2fs/node.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53017

Source reference: /cveMetadata/cveId

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Event
#46354 · Revision 1
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