Local denial of service via leaked invalidate lock
Published Sep 4, 2026 · Updated Sep 4, 2026
Denial of service in the Linux kernel FUSE DAX path allows local users to stall later faults or truncates on an affected file. In fuse_open(), the fuse_dax_break_layouts() failure path jumps past filemap_invalidate_unlock(), leaving the filemap invalidate rwsem locked. Triggering requires an O_TRUNC open on a DAX-backed FUSE file and a signal that interrupts the wait for busy DAX pages to drain.
Summary
What happened
Denial of service in the Linux kernel FUSE DAX path allows local users to stall later faults or truncates on an affected file. In fuse_open(), the fuse_dax_break_layouts() failure path jumps past filemap_invalidate_unlock(), leaving the filemap invalidate rwsem locked. Triggering requires an O_TRUNC open on a DAX-backed FUSE file and a signal that interrupts the wait for busy DAX pages to drain.
The record
- CVE
- CVE-2026-80855
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1fdbbe246daf348adaa0739463384b16ceba1fc0
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <7288c279ddbd654a06c82118c1a3f5570c1807f0
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <776e85fda752f9a15e0f82dec42ecacd12a9bd94
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <a61524da59a2f5ac9c8de23ff98b30da769ab144
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <a927f1867e61b78f39f9da0bbba3c98c2ca151fe
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <dcf30a56624c2a0cfab1bada5b1ca8cc0c02f010
- Affected versionversion=2fdbb8dd01556e1501132b5ad3826e8f71e24a8b <e981474d7bf1457da12404e169ea147d2c8ecea7
- Affected versionversion=5.10.179 <5.11
- Affected versionversion=5.15.109 <5.15.220
- Affected versionversion=5.18.18 <5.19
- Affected versionversion=5.19.2 <5.20
- Affected versionversion=6.0
- Affected versionversion=81775ab858b4236c52c5da7e25cec6e49dd91b46
- Affected versionversion=b57e150ac2eac791d5d187923b73dc2dafaf67fa
- Affected versionversion=d58366aab86854217b81679d1a9dcd54a2edfc2a <1b04d80a27d317064cce2307472f5bef9975bc50
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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