{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80856",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80856"
  ],
  "published": "2026-09-04T15:53:40Z",
  "summary": "fuse: fix invalidate lock leak on setattr writeback failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on setattr writeback failure\n\nfuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate\n(fault_blocked = true) and releases it at the out:/error: labels.  But\nwhen a writeback flush is also needed, a write_inode_now() failure\nreturns directly and leaks the lock, so any later fault or truncate on\nthe file stalls on the stale rwsem.\n\nFor example, truncate(2) on a setuid file reaches fuse_do_setattr()\nwith both ATTR_SIZE and ATTR_MODE set:\n\n  truncate(2)\n  \u2514\u2500 do_truncate()\n     \u251c\u2500 dentry_needs_remove_privs()         # S_ISUID\n     \u2514\u2500 notify_change()                     # KILL_SUID -> ATTR_MODE\n        \u2514\u2500 fuse_setattr()                   # no killpriv:\n           \u2502                                #   ia_valid |= ATTR_MODE\n           \u2514\u2500 fuse_do_setattr()\n              \u251c\u2500 filemap_invalidate_lock()  # IS_DAX && is_truncate\n              \u2514\u2500 write_inode_now()          # is_wb && ATTR_MODE\n                 \u2514\u2500 if (err)                # e.g. daemon -> -EIO\n                    return err              # <- lock leaked\n\nFix this by adding an unlock label that releases the lock before\nreturning the error, and use it for the fuse_dax_break_layouts()\nfailure path as well.",
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-04T15:53:40Z"
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}