Vulnerability-Lookup

GHSA-HC5W-42JX-9CR6

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80996"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:06Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-hc5w-42jx-9cr6",
  "modified": "2026-09-11T21:31:23Z",
  "published": "2026-09-11T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80996"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fe037d5eaad938aa3e9143ee071aa237750b42b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50c4038f1670bf9a80c6a58ae83d1602decd8481"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c340473f4822bb31b151c19afd17448eda5acd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af20e269f7459d2ce69887fdf2fad7caf986c865"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80996 (GCVE-0-2026-80996)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-11 19:42

Title

net: l2tp: do not propagate multicast notification errors

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/0fe037d5eaad938aa…
https://git.kernel.org/stable/c/9c340473f4822bb31…
https://git.kernel.org/stable/c/50c4038f1670bf9a8…
https://git.kernel.org/stable/c/af20e269f7459d2ce…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b , < 0fe037d5eaad938aa3e9143ee071aa237750b42b (git) Affected: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b , < 9c340473f4822bb31b151c19afd17448eda5acd1 (git) Affected: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b , < 50c4038f1670bf9a80c6a58ae83d1602decd8481 (git) Affected: 33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b , < af20e269f7459d2ce69887fdf2fad7caf986c865 (git)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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        {
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          "programFiles": [
            "net/l2tp/l2tp_netlink.c"
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            {
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              "version": "33f72e6f0c67f673fd0c63a8182dbd9ffb8cf50b",
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          "versions": [
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              "lessThanOrEqual": "6.18.*",
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              "versionType": "semver"
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            {
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              "version": "7.2.4",
              "versionType": "semver"
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    "dateReserved": "2026-08-26T14:34:25.812Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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