CVE-2026-97534 (GCVE-0-2026-97534)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-09-25 10:21
VLAI
Title
f2fs: accurately adjust free_sections during free_segment_range
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < ca31116fad0954c61a0d38163cc51c48e4981b75 (git)
Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 8a123a10770d2132d046748f20f02baa8d5539a1 (git)
Affected: b4b10061ef98c583bcf82a4200703fbaa98c18dc , < 8c963d1738fdca400082ff5f9d99e083de4f4e70 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: accurately adjust free_sections during free_segment_range\n\nIn free_segment_range(), MAIN_SECS(sbi) is temporarily reduced by `secs`\nto restrict block allocation to the safe remaining main area while valid\nblocks in the truncated range are evacuated by GC.\n\nHowever, FREE_I(sbi)-\u003efree_sections tracks the total number of free\nsections across the whole filesystem. If any sections within the\ntruncated range were already free upon entering free_segment_range(),\nfailing to deduct them from free_sections causes the filesystem to\noverestimate available free sections in the active, reduced main area.\nThis leads to inconsistent free section accounting during GC data\nmigration and can trigger unexpected allocation failures or assertion\nerrors when space is tight.\n\nFix this by calculating the number of already-free sections in the\ntruncated range, deducting them from free_sections upon entering\nfree_segment_range(), and restoring them on exit."
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    "dateReserved": "2026-09-24T16:01:01.153Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: accurately adjust free_sections during free_segment_range\n\nIn free_segment_range(), MAIN_SECS(sbi) is temporarily reduced by `secs`\nto restrict block allocation to the safe remaining main area while valid\nblocks in the truncated range are evacuated by GC.\n\nHowever, FREE_I(sbi)-\u003efree_sections tracks the total number of free\nsections across the whole filesystem. If any sections within the\ntruncated range were already free upon entering free_segment_range(),\nfailing to deduct them from free_sections causes the filesystem to\noverestimate available free sections in the active, reduced main area.\nThis leads to inconsistent free section accounting during GC data\nmigration and can trigger unexpected allocation failures or assertion\nerrors when space is tight.\n\nFix this by calculating the number of already-free sections in the\ntruncated range, deducting them from free_sections upon entering\nfree_segment_range(), and restoring them on exit."
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}



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