{"cve":"CVE-2026-80856","nvd":{"published":"2026-09-04T16:18:14.660","modified":"2026-10-19T09:17:21.273","status":"Received","description":"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  └─ do_truncate()\n     ├─ dentry_needs_remove_privs()         # S_ISUID\n     └─ notify_change()                     # KILL_SUID -> ATTR_MODE\n        └─ fuse_setattr()                   # no killpriv:\n           │                                #   ia_valid |= ATTR_MODE\n           └─ fuse_do_setattr()\n              ├─ filemap_invalidate_lock()  # IS_DAX && is_truncate\n              └─ write_inode_now()          # is_wb && ATTR_MODE\n                 └─ 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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695","https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed","https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763","https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2","https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80856","score":0.00165,"percentile":0.05619,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}