CVE-2026-80996 (GCVE-0-2026-80996)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-21 12:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: l2tp: do not propagate multicast notification errors The tunnel create, tunnel modify, session create, and session modify netlink handlers send multicast notifications through helpers that can fail while allocating or encoding a message, or while multicasting it. For tunnel and session create/modify, a notification is sent after the live operation has completed. Returning a best-effort notification error as the command result can therefore report failure for an operation that already committed and can cause callers to retry and accumulate live objects. Keep sending notifications for listener visibility, but do not propagate their best-effort status as the command result. This also keeps the tunnel modify command consistent with the other notification-only paths.
References
Impacted products
Vendor Product Version
Linux Linux Version: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b
Version: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b
Version: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b
Version: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b
Version: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b
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{
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          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_netlink.c"
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "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\nnet: l2tp: do not propagate multicast notification errors\n\nThe tunnel create, tunnel modify, session create, and session modify\nnetlink handlers send multicast notifications through helpers that can fail\nwhile allocating or encoding a message, or while multicasting it.\n\nFor tunnel and session create/modify, a notification is sent after the live\noperation has completed. Returning a best-effort notification error as the\ncommand result can therefore report failure for an operation that already\ncommitted and can cause callers to retry and accumulate live objects.\n\nKeep sending notifications for listener visibility, but do not propagate\ntheir best-effort status as the command result. This also keeps the tunnel\nmodify command consistent with the other notification-only paths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:47:23.378Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7efe1c31e0903a5aa796feb96d3adab574b7ff41"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fe037d5eaad938aa3e9143ee071aa237750b42b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c340473f4822bb31b151c19afd17448eda5acd1"
        },
        {
          "url": "https://git.kernel.org/stable/c/50c4038f1670bf9a80c6a58ae83d1602decd8481"
        },
        {
          "url": "https://git.kernel.org/stable/c/af20e269f7459d2ce69887fdf2fad7caf986c865"
        }
      ],
      "title": "net: l2tp: do not propagate multicast notification errors",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80996",
    "datePublished": "2026-09-11T19:42:51.542Z",
    "dateReserved": "2026-08-26T14:34:25.812Z",
    "dateUpdated": "2026-10-21T12:47:23.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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