CVE-2026-97534f2fs: accurately adjust free_sections during free_segment_range
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: f2fs: accurately adjust free_sections during free_segment_range In free_segment_range(), MAIN_SECS(sbi) is temporarily reduced by `secs` to restrict block allocation to the safe remaining main area while valid blocks in the truncated range are evacuated by GC. However, FREE_I(sbi)->free_sections tracks the total number of free sections across the whole filesystem. If any sections within the truncated range were already free upon entering free_segment_range(), failing to deduct them from free_sections causes the filesystem to overestimate available free sections in the active, reduced main area. This leads to inconsistent free section accounting during GC data migration and can trigger unexpected allocation failures or assertion errors when space is tight. Fix this by calculating the number of already-free sections in the truncated range, deducting them from free_sections upon entering free_segment_range(), and restoring them on exit.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b4b10061ef98c583bcf82a4200703fbaa98c18dc before faeb0a20bdd113311519b598dcc075af3b6fb366; from b4b10061ef98c583bcf82a4200703fbaa98c18dc before ca31116fad0954c61a0d38163cc51c48e4981b75; from b4b10061ef98c583bcf82a4200703fbaa98c18dc before 8a123a10770d2132d046748f20f02baa8d5539a1; from b4b10061ef98c583bcf82a4200703fbaa98c18dc before 8c963d1738fdca400082ff5f9d99e083de4f4e70 | CNA record |
References
- https://git.kernel.org/stable/c/faeb0a20bdd113311519b598dcc075af3b6fb366
- https://git.kernel.org/stable/c/ca31116fad0954c61a0d38163cc51c48e4981b75
- https://git.kernel.org/stable/c/8a123a10770d2132d046748f20f02baa8d5539a1
- https://git.kernel.org/stable/c/8c963d1738fdca400082ff5f9d99e083de4f4e70
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.