{
  "cveId": "CVE-2026-43042",
  "url": "https://patchblox.com/security/cve/CVE-2026-43042",
  "summary": "CVE-2026-43042 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-43042, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "mpls: add seqcount to protect the platform_label{,s} pair",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mpls: add seqcount to protect the platform_label{,s} pair  The RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have an inconsistent view of platform_labels vs platform_label in case of a concurrent resize (resize_platform_label_table, under platform_mutex). This can lead to OOB accesses.  This patch adds a seqcount, so that we get a consistent snapshot.  Note that mpls_label_ok is also susceptible to this, so the check against RTA_DST in rtm_to_route_config, done outside platform_mutex, is not sufficient. This value gets passed to mpls_label_ok once more in both mpls_route_add and mpls_route_del, so there is no issue, but that additional check must not be removed.",
  "published": "2026-05-01T15:16:50Z",
  "severity": "Important",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "cwe": "Out-of-bounds Read",
  "epss": 0.00134,
  "epssPercentile": 0.02954,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43042",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-43042",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43042",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.12-1",
      "fix": "DEBIAN-CVE-2026-43042",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43042",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}