{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: close crash window in attr dabtree inactivation\n\nWhen inactivating an inode with node-format extended attributes,\nxfs_attr3_node_inactive() invalidates all child leaf/node blocks via\nxfs_trans_binval(), but intentionally does not remove the corresponding\nentries from their parent node blocks.  The implicit assumption is that\nxfs_attr_inactive() will truncate the entire attr fork to zero extents\nafterwards, so log recovery will never reach the root node and follow\nthose stale pointers.\n\nHowever, if a log shutdown occurs after the leaf/node block cancellations\ncommit but before the attr bmap truncation commits, this assumption\nbreaks.  Recovery replays the attr bmap intact (the inode still has\nattr fork extents), but suppresses replay of all cancelled leaf/node\nblocks, maybe leaving them as stale data on disk.  On the next mount,\nxlog_recover_process_iunlinks() retries inactivation and attempts to\nread the root node via the attr bmap. If the root node was not replayed,\nreading the unreplayed root block triggers a metadata verification\nfailure immediately; if it was replayed, following its child pointers\nto unreplayed child blocks triggers the same failure:\n\n XFS (pmem0): Metadata corruption detected at\n xfs_da3_node_read_verify+0x53/0x220, xfs_da3_node block 0x78\n XFS (pmem0): Unmount and run xfs_repair\n XFS (pmem0): First 128 bytes of corrupted metadata buffer:\n 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n XFS (pmem0): metadata I/O error in \"xfs_da_read_buf+0x104/0x190\" at daddr 0x78 len 8 error 117\n\nFix this in two places:\n\nIn xfs_attr3_node_inactive(), after calling xfs_trans_binval() on a\nchild block, immediately remove the entry that references it from the\nparent node in the same transaction.  This eliminates the window where\nthe parent holds a pointer to a cancelled block.  Once all children are\nremoved, the now-empty root node is converted to a leaf block within the\nsame transaction. This node-to-leaf conversion is necessary for crash\nsafety. If the system shutdown after the empty node is written to the\nlog but before the second-phase bmap truncation commits, log recovery\nwill attempt to verify the root block on disk. xfs_da3_node_verify()\ndoes not permit a node block with count == 0; such a block will fail\nverification and trigger a metadata corruption shutdown. on the other\nhand, leaf blocks are allowed to have this transient state.\n\nIn xfs_attr_inactive(), split the attr fork truncation into two explicit\nphases.  First, truncate all extents beyond the root block (the child\nextents whose parent references have already been removed above).\nSecond, invalidate the root block and truncate the attr bmap to zero in\na single transaction.  The two operations in the second phase must be\natomic: as long as the attr bmap has any non-zero length, recovery can\nfollow it to the root block, so the root block invalidation must commit\ntogether with the bmap-to-zero truncation."
    }
  ],
  "id": "CVE-2026-43053",
  "lastModified": "2026-05-01T15:24:14.893",
  "metrics": {},
  "published": "2026-05-01T15:16:51.777",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-43053"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: close crash window in attr dabtree inactivation\n\nWhen inactivating an inode with node-format extended attributes,\nxfs_attr3_node_inactive() invalidates all child leaf/node blocks via\nxfs_trans_binval(), but intentionally does not remove the corresponding\nentries from their parent node blocks.  The implicit assumption is that\nxfs_attr_inactive() will truncate the entire attr fork to zero extents\nafterwards, so log recovery will never reach the root node and follow\nthose stale pointers.\n\nHowever, if a log shutdown occurs after the leaf/node block cancellations\ncommit but before the attr bmap truncation commits, this assumption\nbreaks.  Recovery replays the attr bmap intact (the inode still has\nattr fork extents), but suppresses replay of all cancelled leaf/node\nblocks, maybe leaving them as stale data on disk.  On the next mount,\nxlog_recover_process_iunlinks() retries inactivation and attempts to\nread the root node via the attr bmap. If the root node was not replayed,\nreading the unreplayed root block triggers a metadata verification\nfailure immediately; if it was replayed, following its child pointers\nto unreplayed child blocks triggers the same failure:\n\n XFS (pmem0): Metadata corruption detected at\n xfs_da3_node_read_verify+0x53/0x220, xfs_da3_node block 0x78\n XFS (pmem0): Unmount and run xfs_repair\n XFS (pmem0): First 128 bytes of corrupted metadata buffer:\n 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n XFS (pmem0): metadata I/O error in \"xfs_da_read_buf+0x104/0x190\" at daddr 0x78 len 8 error 117\n\nFix this in two places:\n\nIn xfs_attr3_node_inactive(), after calling xfs_trans_binval() on a\nchild block, immediately remove the entry that references it from the\nparent node in the same transaction.  This eliminates the window where\nthe parent holds a pointer to a cancelled block.  Once all children are\nremoved, the now-empty root node is converted to a leaf block within the\nsame transaction. This node-to-leaf conversion is necessary for crash\nsafety. If the system shutdown after the empty node is written to the\nlog but before the second-phase bmap truncation commits, log recovery\nwill attempt to verify the root block on disk. xfs_da3_node_verify()\ndoes not permit a node block with count == 0; such a block will fail\nverification and trigger a metadata corruption shutdown. on the other\nhand, leaf blocks are allowed to have this transient state.\n\nIn xfs_attr_inactive(), split the attr fork truncation into two explicit\nphases.  First, truncate all extents beyond the root block (the child\nextents whose parent references have already been removed above).\nSecond, invalidate the root block and truncate the attr bmap to zero in\na single transaction.  The two operations in the second phase must be\natomic: as long as the attr bmap has any non-zero length, recovery can\nfollow it to the root block, so the root block invalidation must commit\ntogether with the bmap-to-zero truncation.",
  "id": "GHSA-37p6-c4xv-cq5q",
  "modified": "2026-05-01T15:30:37Z",
  "published": "2026-05-01T15:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b854e1c4eff3473b6d3a9ae74129ac5c48bc0b61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5a3e3cdd9b3015ae79456c81beebfdbb5246c0f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-43053 xfs: close crash window in attr dabtree inactivation - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43053.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "xfs: close crash window in attr dabtree inactivation",
    "tracking": {
      "current_release_date": "2026-05-04T14:38:15.000Z",
      "generator": {
        "date": "2026-05-05T07:17:34.586Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-43053",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-02T01:01:52.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-05-04T14:38:15.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.134.1-2.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.134.1-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-43053",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-43053 xfs: close crash window in attr dabtree inactivation - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-43053.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-05-02T01:01:52.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "xfs: close crash window in attr dabtree inactivation"
    }
  ]
}