CVE-2026-64187 (GCVE-0-2026-64187)
Vulnerability from cvelistv5
Published
2026-07-20 16:27
Modified
2026-08-17 04:51
Severity ?
Summary
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)
References
Impacted products
Vendor Product Version
Linux Linux Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
Version: 89cebc8477290b152618ffa110bbeae340d50900
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_log_recover.c"
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "7.1.4",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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-\u003eri_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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:51:48.578Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5105426424ad6981db827cc1ada835a488fab035"
        },
        {
          "url": "https://git.kernel.org/stable/c/226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0ae7ec3aa61db5140b107f0a63e017f63e56a96"
        },
        {
          "url": "https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749"
        },
        {
          "url": "https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211"
        }
      ],
      "title": "xfs: fail recovery on a committed log item with no regions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64187",
    "datePublished": "2026-07-20T16:27:46.653Z",
    "dateReserved": "2026-07-19T07:54:57.040Z",
    "dateUpdated": "2026-08-17T04:51:48.578Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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