{"cve":"CVE-2026-80809","nvd":{"published":"2026-09-04T16:18:08.190","modified":"2026-10-19T09:17:15.673","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix missing metadata reservation for large xattrs\n\n[BUG]\nlsetxattr() panics the kernel when setting a large xattr value on a\nfragmented filesystem where the file already has an external xattr\nblock.\n\n[CAUSE]\nocfs2_calc_xattr_set_need() never reserves metadata blocks for a new\nxattr value's extent tree when the file already has an external xattr\nblock. The not_found path leaves meta_add at zero, so meta_ac is NULL\nwhen ocfs2_xattr_extend_allocation() runs.\n\nA new value root has room for a single extent record. On a fragmented\nfilesystem, the allocator cannot satisfy the xattr value in one\ncontiguous run, so each non-contiguous run requires its own extent\nrecord. When the value root's extent list is full and meta_ac is NULL,\nocfs2_add_clusters_in_btree() returns RESTART_META, and\nocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).\n\n[FIX]\nThe case where no xattr block exists yet already calls\nocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree\nmetadata. Add the same reservation to the case where an xattr block\nalready exists, making the two cases consistent.\n\nReplace the BUG_ON with a -ENOSPC return so that if RESTART_META is\nreturned despite the reservation, the error propagates to userspace\ninstead of panicking the kernel.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d","https://git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a","https://git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f","https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5","https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80809","score":0.00195,"percentile":0.09118,"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."]}