CVE-2026-64187 (GCVE-0-2026-64187)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-07-20 16:27
VLAI
Title
xfs: fail recovery on a committed log item with no regions
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)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 89cebc8477290b152618ffa110bbeae340d50900 , < d50b1fd066d66ceb548ba43e332cfe8a47e5e55a (git)
Affected: 89cebc8477290b152618ffa110bbeae340d50900 , < d98f22d2e11e0a36493aeb25b2933571ee90d9a4 (git)
Affected: 89cebc8477290b152618ffa110bbeae340d50900 , < cccbabeb9a18fcb978d76d6047f2b59214aa7749 (git)
Affected: 89cebc8477290b152618ffa110bbeae340d50900 , < 2094dab19d45c487285617b7b68913d0cc0c1211 (git)
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Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_log_recover.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "versionType": "semver"
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      "cpeApplicability": [
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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": "2026-07-20T16:27:46.653Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "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"
      }
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  "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": "2026-07-20T16:27:46.653Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "percentile": "0.05264"
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      "cve": "CVE-2026-64187",
      "id": "msrc_CVE-2026-64187",
      "initial_release_date": "2026-07-22T01:01:32.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "xfs: fail recovery on a committed log item with no regions",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64187.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T10:21:18+00:00",
      "cve": "CVE-2026-64187",
      "id": "CVE-2026-64187",
      "initial_release_date": "2026-07-20T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfs: fail recovery on a committed log item with no regions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64187.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-21T12:58:07Z",
      "cve": "CVE-2026-64187",
      "id": "CVE-2026-64187",
      "initial_release_date": "2026-07-21T12:58:07Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64187",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64187.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.