{"cve":"CVE-2026-80855","nvd":{"published":"2026-09-04T16:18:14.507","modified":"2026-10-19T09:17:21.140","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: fix invalidate lock leak on open O_TRUNC DAX failure\n\nfuse_open() takes filemap_invalidate_lock() for a DAX truncate\n(dax_truncate = true) and releases it before the out_inode_unlock\nlabel.  But when fuse_dax_break_layouts() fails, the goto\nout_inode_unlock skips the unlock and leaks the rwsem, so any later\nfault or truncate on the file stalls on the stale lock.\n\nfuse_dax_break_layouts() can fail with -ERESTARTSYS when a signal\ninterrupts the wait for busy DAX pages to drain:\n\n  open(\"file\", O_RDWR | O_TRUNC)\n  └─ fuse_open()\n     ├─ filemap_invalidate_lock()        # dax_truncate\n     └─ fuse_dax_break_layouts()\n        └─ dax_break_layout()\n           └─ wait_page_idle()           # TASK_INTERRUPTIBLE\n              └─ fuse_wait_dax_page()    # unlock, schedule, re-lock\n                 └─ signal → -ERESTARTSYS\n     goto out_inode_unlock               # <- lock leaked\n\nFix this by moving filemap_invalidate_unlock() below the label so\nthat all error paths release the lock, and rename the label to\nout_unlock as it now covers more than just the inode lock.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1b04d80a27d317064cce2307472f5bef9975bc50","https://git.kernel.org/stable/c/1d3e701cda2f41d48aa721b3ebefbe0fbf8d74da","https://git.kernel.org/stable/c/7288c279ddbd654a06c82118c1a3f5570c1807f0","https://git.kernel.org/stable/c/776e85fda752f9a15e0f82dec42ecacd12a9bd94","https://git.kernel.org/stable/c/a61524da59a2f5ac9c8de23ff98b30da769ab144"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80855","score":0.00165,"percentile":0.05617,"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."]}