CVE-2026-80855
In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on open O_TRUNC DAX failure fuse_open() takes filemap_invalidate_lock() for a DAX truncate (dax_truncate = true) and releases it before the out_inode_unlock label. But when fuse_dax_break_layouts() fails, the goto out_inode_unlock skips the unlock and leaks the rwsem, so any later fault or truncate on the file stalls on the stale lock. fuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal interrupts the wait for busy DAX pages to drain: open("file", O_RDWR | O_TRUNC) └─ fuse_open() ├─ filemap_invalidate_lock() # dax_truncate └─ fuse_dax_break_layouts() └─ dax_break_layout() └─ wait_page_idle() # TASK_INTERRUPTIBLE └─ fuse_wait_dax_page() # unlock, schedule, re-lock └─ signal → -ERESTARTSYS goto out_inode_unlock # <- lock leaked Fix this by moving filemap_invalidate_unlock() below the label so that all error paths release the lock, and rename the label to out_unlock as it now covers more than just the inode lock.
Affected versions
Linux kernel versions
5.15.109,
5.10.179,
5.18.18,
5.19.2,
6.0
and later are affected. Fixed in
5.15.220,
6.1.187,
6.6.156,
6.12.108,
6.18.49,
7.1.13,
7.2.3,
7.3
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-80855?
CVE-2026-80855 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.109 onward and has been patched in 5.15.220, 6.1.187, 6.6.156 and others. CVE-2026-80855 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-2026-80855?
Yes. CVE-2026-80855 has been patched. Fixed versions include 5.15.220, 6.1.187, 6.6.156 and others. If you are running Linux kernel 5.15.109 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80855 actively exploited?
No. CVE-2026-80855 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.