CVE-2026-98223 (GCVE-0-2026-98223)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
Title
mm: filemap: retain mapped dropbehind folios
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: filemap: retain mapped dropbehind folios Fault-around can map ready dropbehind folios without going through the normal page-cache lookup that clears dropbehind. A mapping represents a competing cached user, so retain the folio instead of forcibly unmapping it when writeback completes. For a mapped folio, folio_unmap_invalidate() can call unmap_mapping_folio(), which takes i_mmap_rwsem and may sleep. Retaining mapped folios avoids this path when folio_end_dropbehind() runs in non-preemptible task context. Tal was able to trigger a sleeping-in-atomic warning due to this [1]. Unmapped dropbehind folios continue through the existing invalidation path.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < 2897601dffe576fcd87a4259102f41f7fb0cbfc8 (git)
Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < 77c0fade37c80e8aa16ac048a9828249055e3f66 (git)
Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < 848d2ce2fce15fbdc083fbf9691bfa72911033c4 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
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      "source": "SUSE CSAF VEX",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98223.json",
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}



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