{
  "cveId": "CVE-2026-43455",
  "url": "https://patchblox.com/security/cve/CVE-2026-43455",
  "summary": "CVE-2026-43455 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43455, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mctp: route: hold key-\u003Elock in mctp_flow_prepare...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mctp: route: hold key-\u003Elock in mctp_flow_prepare_output()  mctp_flow_prepare_output() checks key-\u003Edev and may call mctp_dev_set_key(), but it does not hold key-\u003Elock while doing so.  mctp_dev_set_key() and mctp_dev_release_key() are annotated with __must_hold(\u0026key-\u003Elock), so key-\u003Edev access is intended to be serialized by key-\u003Elock. The mctp_sendmsg() transmit path reaches mctp_flow_prepare_output() via mctp_local_output() -\u003E mctp_dst_output() without holding key-\u003Elock, so the check-and-set sequence is racy.  Example interleaving:    CPU0                                  CPU1   ----                                  ----   mctp_flow_prepare_output(key, devA)     if (!key-\u003Edev)  // sees NULL                                         mctp_flow_prepare_output(                                             key, devB)                                           if (!key-\u003Edev)  // still NULL                                           mctp_dev_set_key(devB, key)                                             mctp_dev_hold(devB)                                             key-\u003Edev = devB     mctp_dev_set_key(devA, key)       mctp_dev_hold(devA)       key-\u003Edev = devA   // overwrites devB  Now both devA and devB references were acquired, but only the final key-\u003Edev value is tracked for release. One reference can be lost, causing a resource leak as mctp_dev_release_key() would only decrease the reference on one dev.  Fix by taking key-\u003Elock around the key-\u003Edev check and mctp_dev_set_key() call.",
  "published": "2026-05-08T15:16:58Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00114,
  "epssPercentile": 0.01502,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:20965-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20965-1",
      "released": "2026-06-15T13:44:30Z"
    },
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      "product": "kernel-64kb",
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      "fix": "OPENSUSE-SU-2026:20965-1",
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      "released": "2026-06-15T13:44:30Z"
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      "fix": "SUSE-SU-2026:2482-1",
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      "released": "2026-06-22T11:10:39Z"
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      "fix": "SUSE-SU-2026:22127-1",
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      "released": "2026-06-15T13:06:19Z"
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      "product": "kernel-azure",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}