{"id":"CVE-2026-64187","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-64187","generatedAt":"2026-10-28T10:45:58.043Z","title":"In the Linux kernel, the following vulnerability has been resolved: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)),…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fail recovery on a committed log item with no regions\n\nIf the first op of a transaction is a bare transaction header\n(len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans()\nadds an item but no region, leaving it on r_itemq with ri_cnt == 0 and\nri_buf == NULL.\n\nThe header can be split across op records, so later ops may still add\nregions; the item is only invalid if the transaction commits with none.\nThe runtime commit path never emits such a transaction, so this only\nhappens on a crafted log.  It came from an AI-assisted code audit of the\nrecovery parser.\n\nxlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads\n*(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL\nri_buf.  Reject it there, before the commit handlers that also read\nri_buf[0].\n\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836)\n  xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043)\n  xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501)\n  xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244)\n  xlog_recover (fs/xfs/xfs_log_recover.c:3493)\n  xfs_log_mount (fs/xfs/xfs_log.c:618)\n  xfs_mountfs (fs/xfs/xfs_mount.c:1034)\n  xfs_fs_fill_super (fs/xfs/xfs_super.c:1938)\n  vfs_get_tree (fs/super.c:1695)\n  path_mount (fs/namespace.c:4161)\n  __x64_sys_mount (fs/namespace.c:4367)","published":"2026-07-20T17:18:22.000Z","lastModified":"2026-08-17T05:17:22.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["linux/linux kernel"],"epss":{"score":0.00114,"percentile":0.01478,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.11%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64187","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}