Bug 2436782 (CVE-2026-23109)

Summary: CVE-2026-23109 kernel: fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2026-02-04 17:03:07 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()

Above the while() loop in wait_sb_inodes(), we document that we must wait
for all pages under writeback for data integrity.  Consequently, if a
mapping, like fuse, traditionally does not have data integrity semantics,
there is no need to wait at all; we can simply skip these inodes.

This restores fuse back to prior behavior where syncs are no-ops.  This
fixes a user regression where if a system is running a faulty fuse server
that does not reply to issued write requests, this causes wait_sb_inodes()
to wait forever.
Comment 1 Jon Moroney 2026-02-04 23:53:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020431-CVE-2026-23109-3e57@gregkh/T