Vulnerability-Lookup

FKIE_CVE-2026-43084

Vulnerability from fkie_nvd - Published: 2026-05-06 10:16 - Updated: 2026-05-20 23:06

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
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    {
      "nodes": [
        {
          "cpeMatch": [
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              "versionEndExcluding": "6.12.83",
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      "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."
    }
  ],
  "id": "CVE-2026-43084",
  "lastModified": "2026-05-20T23:06:46.363",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
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  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
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          "lang": "en",
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        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

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

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

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          "defaultStatus": "unaffected",
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          "programFiles": [
            "include/net/netfilter/nf_queue.h",
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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.

Action not permitted

FKIE_CVE-2026-43084

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

Tags

Sightings

Nomenclature