{"id":"CVE-2026-80809","title":"ocfs2: fix missing metadata reservation for large xattrs","summary":"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…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 743ac908282ac97ef6e73ac3a92df2cc8ecb7479","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 04ba24bce61c917b5b3009f0db470cbb72e26a0d","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < b4663405ae29d36011cd712d243456f3f9ab700d","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 6a009f1e61b11d9e23d3c5aa1dacfb010945da45","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 6176313622e34fa3e2b66b9d0682d1e1c6b365c5","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < a3ccb57086dd7652d5ecb826486144198a98a8e9","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f","Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 0cdc7dde00ec63ac714271fa8b2918d630b8da1a","Linux 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0","Linux >= 2.6.34.2 < 2.6.35","Linux 2.6.35"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:44:02.755Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80809","references":[{"url":"https://git.kernel.org/stable/c/743ac908282ac97ef6e73ac3a92df2cc8ecb7479"},{"url":"https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d"},{"url":"https://git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d"},{"url":"https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45"},{"url":"https://git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec"},{"url":"https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5"},{"url":"https://git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9"},{"url":"https://git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f"},{"url":"https://git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.08588,"ingestedAt":"2026-10-19T09:16:01.523Z","slug":"CVE-2026-80809","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 743ac908282ac97ef6e73ac3a92df2cc8ecb7479`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 04ba24bce61c917b5b3009f0db470cbb72e26a0d`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < b4663405ae29d36011cd712d243456f3f9ab700d`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 6a009f1e61b11d9e23d3c5aa1dacfb010945da45`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 6176313622e34fa3e2b66b9d0682d1e1c6b365c5`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < a3ccb57086dd7652d5ecb826486144198a98a8e9`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f`\n- `Linux >= a78f9f4668949a6588b8872f162e86685c63d023 < 0cdc7dde00ec63ac714271fa8b2918d630b8da1a`\n- `Linux 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0`\n- `Linux >= 2.6.34.2 < 2.6.35`\n- `Linux 2.6.35`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}