Vulnerability-Lookup

GHSA-6C86-HP8G-CHH5

Vulnerability from github – Published: 2026-05-05 18:33 – Updated: 2026-05-08 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_ct: drop pending enqueued packets on removal

Packets sitting in nfqueue might hold a reference to:

templates that specify the conntrack zone, because a percpu area is used and module removal is possible.
conntrack timeout policies and helper, where object removal leave a stale reference.

Since these objects can just go away, drop enqueued packets to avoid stale reference to them.

If there is a need for finer grain removal, this logic can be revisited to make selective packet drop upon dependencies.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43060"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-05T16:16:15Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_ct: drop pending enqueued packets on removal\n\nPackets sitting in nfqueue might hold a reference to:\n\n- templates that specify the conntrack zone, because a percpu area is\n  used and module removal is possible.\n- conntrack timeout policies and helper, where object removal leave\n  a stale reference.\n\nSince these objects can just go away, drop enqueued packets to avoid\nstale reference to them.\n\nIf there is a need for finer grain removal, this logic can be revisited\nto make selective packet drop upon dependencies.",
  "id": "GHSA-6c86-hp8g-chh5",
  "modified": "2026-05-08T15:31:15Z",
  "published": "2026-05-05T18:33:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43060"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36eae0956f659e48d5366d9b083d9417f3263ddc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3da0b946835f33bf36b459ead764c61a761e689b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6802ff8beceb9c4254318e81c1395720438f2cc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77da55dee67720e2b8d2db49a53334e6c017ee7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a64e76933672b08bd85b63086f33432070fd729"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab50302190b303f847c4eba0e31a01a56dec596e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e68a8db3a0546482b34e9ca5ca886bcf73eb37bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f29a055e4f593e577805b41228b142b58f48df1b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43060 (GCVE-0-2026-43060)

Vulnerability from cvelistv5 – Published: 2026-05-05 15:17 – Updated: 2026-08-05 12:25

Title

netfilter: nft_ct: drop pending enqueued packets on removal

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: drop pending enqueued packets on removal Packets sitting in nfqueue might hold a reference to: - templates that specify the conntrack zone, because a percpu area is used and module removal is possible. - conntrack timeout policies and helper, where object removal leave a stale reference. Since these objects can just go away, drop enqueued packets to avoid stale reference to them. If there is a need for finer grain removal, this logic can be revisited to make selective packet drop upon dependencies.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8a64e76933672b08b…
https://git.kernel.org/stable/c/3da0b946835f33bf3…
https://git.kernel.org/stable/c/ab50302190b303f84…
https://git.kernel.org/stable/c/e68a8db3a0546482b…
https://git.kernel.org/stable/c/6802ff8beceb9c425…
https://git.kernel.org/stable/c/f29a055e4f593e577…
https://git.kernel.org/stable/c/77da55dee67720e2b…
https://git.kernel.org/stable/c/36eae0956f659e48d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < 8a64e76933672b08bd85b63086f33432070fd729 (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < 3da0b946835f33bf36b459ead764c61a761e689b (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < ab50302190b303f847c4eba0e31a01a56dec596e (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < e68a8db3a0546482b34e9ca5ca886bcf73eb37bb (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < 6802ff8beceb9c4254318e81c1395720438f2cc2 (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < f29a055e4f593e577805b41228b142b58f48df1b (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < 77da55dee67720e2b8d2db49a53334e6c017ee7b (git) Affected: 7e0b2b57f01d183e1c84114f1f2287737358d748 , < 36eae0956f659e48d5366d9b083d9417f3263ddc (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_ct.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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            },
            {
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              "versionType": "git"
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            {
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              "version": "7e0b2b57f01d183e1c84114f1f2287737358d748",
              "versionType": "git"
            },
            {
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            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_ct: drop pending enqueued packets on removal\n\nPackets sitting in nfqueue might hold a reference to:\n\n- templates that specify the conntrack zone, because a percpu area is\n  used and module removal is possible.\n- conntrack timeout policies and helper, where object removal leave\n  a stale reference.\n\nSince these objects can just go away, drop enqueued packets to avoid\nstale reference to them.\n\nIf there is a need for finer grain removal, this logic can be revisited\nto make selective packet drop upon dependencies."
        }
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            "baseSeverity": "HIGH",
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              "value": "AV:L - The vulnerable path is reached through local NETLINK_NETFILTER/nftables and NFQUEUE configuration plus verdict reinjection, not directly by unauthenticated network packets.\nAC:L - The attacker can deterministically create the nft ct timeout/helper/zone rule, queue packets, remove the referenced object, and reinject the queued packet; no uncontrollable race is required.\nPR:L - nfnetlink requires CAP_NET_ADMIN over the target network namespace, and nftables/netfilter administration is reachable by an unprivileged user via user and network namespaces where enabled.\nUI:N - Exploitation does not require victim interaction after the attacker has local execution; the attacker drives the netlink operations, packet queueing, object removal, and verdicts.\nS:U - The stale reference corrupts or dereferences kernel/netfilter objects within the same kernel security authority; this is a standard local kernel privilege escalation scope.\nC:H - This is a use-after-free/stale-reference condition involving freed nft ct timeout/helper/template objects retained by queued packets, which can be leveraged for kernel memory disclosure.\nI:H - Use-after-free of kernel heap objects and stale helper/function-bearing references can be shaped with heap reuse to gain write/control-flow primitives, so high integrity impact is defensible.\nA:H - At minimum, reinjecting queued packets after object removal can dereference freed kernel memory and crash or oops the kernel."
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        "dateUpdated": "2026-08-05T12:25:39.251Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/ab50302190b303f847c4eba0e31a01a56dec596e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/77da55dee67720e2b8d2db49a53334e6c017ee7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/36eae0956f659e48d5366d9b083d9417f3263ddc"
        }
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      "title": "netfilter: nft_ct: drop pending enqueued packets on removal",
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43060",
    "datePublished": "2026-05-05T15:17:26.393Z",
    "dateReserved": "2026-05-01T14:12:55.981Z",
    "dateUpdated": "2026-08-05T12:25:39.251Z",
    "state": "PUBLISHED"
  },
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.