CVE-2026-64062
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential deadlock in write-through mode Fix netfs_advance_writethrough() to always unlock the supplied folio and to mark it dirty if it isn't yet written to the end. Unfortunately, it can't be marked for writeback until the folio is done with as that may cause a deadlock against mmapped reads and writes. Even though it has been marked dirty, premature writeback can't occur as the caller is holding both inode->i_rwsem (which will prevent concurrent truncation, fallocation, DIO and other writes) and ictx->wb_lock (which will cause flushing to wait and writeback to skip or wait). Note that this may be easier to deal with once the queuing of folios is split from the generation of subrequests.
Affected versions
Linux kernel versions
6.10
and later are affected. Fixed in
6.12.92,
6.18.34,
7.0.11,
7.1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-64062?
CVE-2026-64062 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.10 onward and has been patched in 6.12.92, 6.18.34, 7.0.11 and others. CVE-2026-64062 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64062?
Yes — CVE-2026-64062 has been patched. Fixed versions include 6.12.92, 6.18.34, 7.0.11 and others. If you are running Linux kernel 6.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64062 actively exploited?
No — CVE-2026-64062 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.