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…
A vulnerability in the Linux kernel's f2fs filesystem can cause data loss when fsync is performed on a newly created file concurrently with a checkpoint operation. The issue arises from incorrect use of nat_entry flags that leads to premature assumptions about checkpoint completion. This has been fixed by ensuring proper locking before checking these flags.
AI Analysis
Technical Summary
The Linux kernel's f2fs filesystem had a vulnerability where data loss could occur if fsync was called on a new file before any checkpoint was fully written, concurrently with a checkpoint operation. The root cause was that the nat_entry flags IS_CHECKPOINTED and HAS_LAST_FSYNC were set before the checkpoint actually completed, causing f2fs_need_inode_block_update() to incorrectly assume the checkpoint was done. The fix involves acquiring the sbi->node_write lock before reading these flags, ensuring the checkpoint operation has completed before proceeding.
Potential Impact
Data loss can occur in the affected Linux kernel versions when fsync is performed on a newly created file concurrently with a checkpoint operation in the f2fs filesystem. There is no impact on confidentiality or integrity, but availability is affected due to potential loss of file data.
Mitigation Recommendations
A fix is available that corrects the handling of nat_entry flags by adding proper locking to ensure checkpoint completion before proceeding. Users should update to patched Linux kernel versions that include this fix. Patch status is confirmed by the description of the resolved vulnerability.
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…
Description
A vulnerability in the Linux kernel's f2fs filesystem can cause data loss when fsync is performed on a newly created file concurrently with a checkpoint operation. The issue arises from incorrect use of nat_entry flags that leads to premature assumptions about checkpoint completion. This has been fixed by ensuring proper locking before checking these flags.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's f2fs filesystem had a vulnerability where data loss could occur if fsync was called on a new file before any checkpoint was fully written, concurrently with a checkpoint operation. The root cause was that the nat_entry flags IS_CHECKPOINTED and HAS_LAST_FSYNC were set before the checkpoint actually completed, causing f2fs_need_inode_block_update() to incorrectly assume the checkpoint was done. The fix involves acquiring the sbi->node_write lock before reading these flags, ensuring the checkpoint operation has completed before proceeding.
Potential Impact
Data loss can occur in the affected Linux kernel versions when fsync is performed on a newly created file concurrently with a checkpoint operation in the f2fs filesystem. There is no impact on confidentiality or integrity, but availability is affected due to potential loss of file data.
Mitigation Recommendations
A fix is available that corrects the handling of nat_entry flags by adding proper locking to ensure checkpoint completion before proceeding. Users should update to patched Linux kernel versions that include this fix. Patch status is confirmed by the description of the resolved vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53017
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a015291ae9bcd3f80254e
Added to database: 07/17/2026, 10:17:54 UTC
Last enriched: 07/30/2026, 20:53:01 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 1
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