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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80856

fuse: fix invalidate lock leak on setattr writeback failure

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: fuse: fix invalidate lock leak on setattr writeback failure fuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate (fault_blocked = true) and releases it at the out:/error: labels. But when a writeback flush is also needed, a write_inode_now() failure returns directly and leaks the lock, so any later fault or truncate on the file stalls on the stale rwsem. For example, truncate(2) on a setuid file reaches fuse_do_setattr() with both ATTR_SIZE and ATTR_MODE set: truncate(2) └─ do_truncate() ├─ dentry_needs_remove_privs() # S_ISUID └─ notify_change() # KILL_SUID -> ATTR_MODE └─ fuse_setattr() # no killpriv: │ # ia_valid |= ATTR_MODE └─ fuse_do_setattr() ├─ filemap_invalidate_lock() # IS_DAX && is_truncate └─ write_inode_now() # is_wb && ATTR_MODE └─ if (err) # e.g. daemon -> -EIO return err # <- lock leaked Fix this by adding an unlock label that releases the lock before returning the error, and use it for the fuse_dax_break_layouts() failure path as well.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 92faaee1b108c6e4b07730d20896a6593a85f675affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 8f14906ce9103ab8f2f1ebda45935a0d61b9d763affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 03cfeeb135428fa83f0791d3f8f94d9298cae695affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 92588d187ba4697a322e7aefe5d9e538a87d1cd2affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < ea9fea370b8de4ffd72e0ef89550415c15637787affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 1758730d9eaa3c06cf415c3446d9f6eed9ed3eedaffected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < dd278d954c0e96a9cbd3cc491e07b8267d25f8d5affected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < e8457ebfd77a46e8d1210e8888ea914ad064558eaffected
  • 6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to < 9afeca0d569c9fc89d758fe7a9339d1e8afb1546affected

Linux Linux

Default version status: affected

  • 5.10affected
  • 0 to < 5.10unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.220 to ≤ 5.15.*unaffected
  • 6.1.187 to ≤ 6.1.*unaffected
  • 6.6.156 to ≤ 6.6.*unaffected
  • 6.12.108 to ≤ 6.12.*unaffected
  • 6.18.49 to ≤ 6.18.*unaffected
  • 7.1.13 to ≤ 7.1.*unaffected
  • 7.2.3 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References