{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-01T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: mpls: add seqcount to protect the platform_label{,s} pair",
    "id" : "2464429",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2464429"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-367",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nmpls: add seqcount to protect the platform_label{,s} pair\nThe RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have\nan inconsistent view of platform_labels vs platform_label in case of a\nconcurrent resize (resize_platform_label_table, under\nplatform_mutex). This can lead to OOB accesses.\nThis patch adds a seqcount, so that we get a consistent snapshot.\nNote that mpls_label_ok is also susceptible to this, so the check\nagainst RTA_DST in rtm_to_route_config, done outside platform_mutex,\nis not sufficient. This value gets passed to mpls_label_ok once more\nin both mpls_route_add and mpls_route_del, so there is no issue, but\nthat additional check must not be removed.", "A flaw was found in the Linux kernel's Multiprotocol Label Switching (MPLS) module. This vulnerability is caused by a race condition where concurrent operations on network label data can lead to inconsistent memory access. This can result in out-of-bounds memory reads or writes, potentially causing system instability or a denial of service." ],
  "statement" : "MPLS platform label updates lacked sequence protection; upstream adds seqcount for the label pair. Red Hat recommends patched kernels on MPLS edge routers; core MPLS may be built-in—patching remains primary.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-43042\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43042\nhttps://lore.kernel.org/linux-cve-announce/2026050104-CVE-2026-43042-8e66@gregkh/T" ],
  "name" : "CVE-2026-43042",
  "csaw" : false
}