{"id":"AZL-99474","summary":"CVE-2026-80855 affecting package kernel 6.6.150.1-1","details":"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               # \u003c- 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.","modified":"2026-09-05T14:16:57.891438893Z","published":"2026-09-04T16:18:14Z","upstream":["CVE-2026-80855"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80855"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-99474.json"}}],"schema_version":"1.9.0"}