Vulnerability-Lookup

GHSA-2XW5-2V9X-WC8M

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31

Details

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

netfilter: nfnetlink_queue: make hash table per queue

Sharing a global hash table among all queues is tempting, but it can cause crash:

BUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] [..] nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] nfnetlink_rcv_msg+0x46a/0x930 kmem_cache_alloc_node_noprof+0x11e/0x450

struct nf_queue_entry is freed via kfree, but parallel cpu can still encounter such an nf_queue_entry when walking the list.

Alternative fix is to free the nf_queue_entry via kfree_rcu() instead, but as we have to alloc/free for each skb this will cause more mem pressure.

Severity ?

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-43084"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:21Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: make hash table per queue\n\nSharing a global hash table among all queues is tempting, but\nit can cause crash:\n\nBUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n[..]\n nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n nfnetlink_rcv_msg+0x46a/0x930\n kmem_cache_alloc_node_noprof+0x11e/0x450\n\nstruct nf_queue_entry is freed via kfree, but parallel cpu can still\nencounter such an nf_queue_entry when walking the list.\n\nAlternative fix is to free the nf_queue_entry via kfree_rcu() instead,\nbut as we have to alloc/free for each skb this will cause more mem\npressure.",
  "id": "GHSA-2xw5-2v9x-wc8m",
  "modified": "2026-05-08T15:31:15Z",
  "published": "2026-05-06T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43084"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f"
    }
  ],
  "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-2026-43084 (GCVE-0-2026-43084)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17

Title

netfilter: nfnetlink_queue: make hash table per queue

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: make hash table per queue Sharing a global hash table among all queues is tempting, but it can cause crash: BUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] [..] nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue] nfnetlink_rcv_msg+0x46a/0x930 kmem_cache_alloc_node_noprof+0x11e/0x450 struct nf_queue_entry is freed via kfree, but parallel cpu can still encounter such an nf_queue_entry when walking the list. Alternative fix is to free the nf_queue_entry via kfree_rcu() instead, but as we have to alloc/free for each skb this will cause more mem pressure.

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

References

4 references

URL	Tags
https://git.kernel.org/stable/c/22730cb96093b5be0…
https://git.kernel.org/stable/c/41e3652a178cb0eec…
https://git.kernel.org/stable/c/9e5ebef91120d2764…
https://git.kernel.org/stable/c/936206e3f6ff41158…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 371de2bef6582a3f58049b3d18e190924af9c9a0 , < 22730cb96093b5be0609063bbb1923dbecd61252 (git) Affected: 870e3e63da8e88daffe9d692a025c711658018a8 , < 41e3652a178cb0eecd48e0e6e27fbb73a004046a (git) Affected: 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 , < 9e5ebef91120d2764aefe557c3a484b6288f341f (git) Affected: e19079adcd26a25d7d3e586b1837493361fdf8b6 , < 936206e3f6ff411581e615e930263d6f8b78df9d (git)
Linux	Linux	Affected: 6.12.75 , < 6.12.83 (semver) Affected: 6.18.14 , < 6.18.24 (semver) Affected: 6.19.4 , < 6.19.14 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_queue.h",
            "net/netfilter/nfnetlink_queue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "22730cb96093b5be0609063bbb1923dbecd61252",
              "status": "affected",
              "version": "371de2bef6582a3f58049b3d18e190924af9c9a0",
              "versionType": "git"
            },
            {
              "lessThan": "41e3652a178cb0eecd48e0e6e27fbb73a004046a",
              "status": "affected",
              "version": "870e3e63da8e88daffe9d692a025c711658018a8",
              "versionType": "git"
            },
            {
              "lessThan": "9e5ebef91120d2764aefe557c3a484b6288f341f",
              "status": "affected",
              "version": "70e2e3ce4f6841e12ec1c104fc76c0e707398ec4",
              "versionType": "git"
            },
            {
              "lessThan": "936206e3f6ff411581e615e930263d6f8b78df9d",
              "status": "affected",
              "version": "e19079adcd26a25d7d3e586b1837493361fdf8b6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_queue.h",
            "net/netfilter/nfnetlink_queue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.12.83",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.24",
              "status": "affected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThan": "6.19.14",
              "status": "affected",
              "version": "6.19.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "6.18.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "6.19.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: make hash table per queue\n\nSharing a global hash table among all queues is tempting, but\nit can cause crash:\n\nBUG: KASAN: slab-use-after-free in nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n[..]\n nfqnl_recv_verdict+0x11ac/0x15e0 [nfnetlink_queue]\n nfnetlink_rcv_msg+0x46a/0x930\n kmem_cache_alloc_node_noprof+0x11e/0x450\n\nstruct nf_queue_entry is freed via kfree, but parallel cpu can still\nencounter such an nf_queue_entry when walking the list.\n\nAlternative fix is to free the nf_queue_entry via kfree_rcu() instead,\nbut as we have to alloc/free for each skb this will cause more mem\npressure."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:17:24.983Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252"
        },
        {
          "url": "https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f"
        },
        {
          "url": "https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d"
        }
      ],
      "title": "netfilter: nfnetlink_queue: make hash table per queue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43084",
    "datePublished": "2026-05-06T07:40:19.253Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-11T22:17:24.983Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-2XW5-2V9X-WC8M

CVE-2026-43084 (GCVE-0-2026-43084)

Tags

Sightings

Nomenclature