FKIE_CVE-2026-64187

Vulnerability from fkie_nvd - Published: 2026-07-20 17:18 - Updated: 2026-07-20 17:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_log_recover.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d50b1fd066d66ceb548ba43e332cfe8a47e5e55a",
              "status": "affected",
              "version": "89cebc8477290b152618ffa110bbeae340d50900",
              "versionType": "git"
            },
            {
              "lessThan": "d98f22d2e11e0a36493aeb25b2933571ee90d9a4",
              "status": "affected",
              "version": "89cebc8477290b152618ffa110bbeae340d50900",
              "versionType": "git"
            },
            {
              "lessThan": "cccbabeb9a18fcb978d76d6047f2b59214aa7749",
              "status": "affected",
              "version": "89cebc8477290b152618ffa110bbeae340d50900",
              "versionType": "git"
            },
            {
              "lessThan": "2094dab19d45c487285617b7b68913d0cc0c1211",
              "status": "affected",
              "version": "89cebc8477290b152618ffa110bbeae340d50900",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_log_recover.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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-\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)"
    }
  ],
  "id": "CVE-2026-64187",
  "lastModified": "2026-07-20T17:18:21.743",
  "metrics": {},
  "published": "2026-07-20T17:18:21.743",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2094dab19d45c487285617b7b68913d0cc0c1211"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cccbabeb9a18fcb978d76d6047f2b59214aa7749"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d50b1fd066d66ceb548ba43e332cfe8a47e5e55a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d98f22d2e11e0a36493aeb25b2933571ee90d9a4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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