f2fs: fix data loss caused by incorrect use of nat_entry flag
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.
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
- 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": "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
Publisher severity
No explicit severity was provided.
- Event
- #46354 · Revision 1
- Added to Heist Feed
- Publisher date