CVE-2026-64187
Full vulnerability record from the local CVENow database.
Description
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)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none. The runtime commit path never emits such a transaction, so this only happens on a crafted log. It came from an AI-assisted code audit of the recovery parser. xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads *(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL ri_buf. Reject it there, before the commit handlers that also read ri_buf[0]. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836) xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043) xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501) xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244) xlog_recover (fs/xfs/xfs_log_recover.c:3493) xfs_log_mount (fs/xfs/xfs_log.c:618) xfs_mountfs (fs/xfs/xfs_mount.c:1034) xfs_fs_fill_super (fs/xfs/xfs_super.c:1938) vfs_get_tree (fs/super.c:1695) path_mount (fs/namespace.c:4161) __x64_sys_mount (fs/namespace.c:4367)
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-20 17:18:21.743000
Last modified
2026-11-06 17:18:40.190000
View original CVE JSON
{
"id": "CVE-2026-64187",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-20T17:18:21.743",
"lastModified": "2026-11-06T17:18:40.190",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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)"
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