CVE-2026-45960 (GCVE-0-2026-45960)
Vulnerability from cvelistv5
Published
2026-05-27 12:18
Modified
2026-05-27 12:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: hfsplus: return error when node already exists in hfs_bnode_create When hfs_bnode_create() finds that a node is already hashed (which should not happen in normal operation), it currently returns the existing node without incrementing its reference count. This causes a reference count inconsistency that leads to a kernel panic when the node is later freed in hfs_bnode_put(): kernel BUG at fs/hfsplus/bnode.c:676! BUG_ON(!atomic_read(&node->refcnt)) This scenario can occur when hfs_bmap_alloc() attempts to allocate a node that is already in use (e.g., when node 0's bitmap bit is incorrectly unset), or due to filesystem corruption. Returning an existing node from a create path is not normal operation. Fix this by returning ERR_PTR(-EEXIST) instead of the node when it's already hashed. This properly signals the error condition to callers, which already check for IS_ERR() return values.
References
Impacted products
Vendor Product Version
Linux Linux Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
Version: 634725a92938b0f282b17cec0b007dca77adebd2
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hfsplus/bnode.c"
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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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\nhfsplus: return error when node already exists in hfs_bnode_create\n\nWhen hfs_bnode_create() finds that a node is already hashed (which should\nnot happen in normal operation), it currently returns the existing node\nwithout incrementing its reference count. This causes a reference count\ninconsistency that leads to a kernel panic when the node is later freed\nin hfs_bnode_put():\n\n    kernel BUG at fs/hfsplus/bnode.c:676!\n    BUG_ON(!atomic_read(\u0026node-\u003erefcnt))\n\nThis scenario can occur when hfs_bmap_alloc() attempts to allocate a node\nthat is already in use (e.g., when node 0\u0027s bitmap bit is incorrectly\nunset), or due to filesystem corruption.\n\nReturning an existing node from a create path is not normal operation.\n\nFix this by returning ERR_PTR(-EEXIST) instead of the node when it\u0027s\nalready hashed. This properly signals the error condition to callers,\nwhich already check for IS_ERR() return values."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:18:16.851Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1ca428769cb4737a25bd32fb4d1573cc09eeaeef"
        },
        {
          "url": "https://git.kernel.org/stable/c/507a1de58c21c95ad7c44afccaf1222d1c42246b"
        },
        {
          "url": "https://git.kernel.org/stable/c/986455135b95f32c1f142068e451098fc751749e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b57ada854b32310f224abd61bcfec2d5790ff0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/51838112d9c22502333c3085ca0c0d691e7093c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e6ff6a6fc69cc17ed10c9cb6242935d52acd52d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e9185a42e0e237c74435fd092b7c34537c62156"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8a73cc46c8462a969a7516131feb3096f4c49d3"
        }
      ],
      "title": "hfsplus: return error when node already exists in hfs_bnode_create",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45960",
    "datePublished": "2026-05-27T12:18:16.851Z",
    "dateReserved": "2026-05-13T15:03:33.089Z",
    "dateUpdated": "2026-05-27T12:18:16.851Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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