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

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-11 22:17
VLAI?
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: 371de2bef6582a3f58049b3d18e190924af9c9a0 , < 22730cb96093b5be0609063bbb1923dbecd61252 (git)
Affected: 870e3e63da8e88daffe9d692a025c711658018a8 , < 41e3652a178cb0eecd48e0e6e27fbb73a004046a (git)
Affected: 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 , < 9e5ebef91120d2764aefe557c3a484b6288f341f (git)
Affected: e19079adcd26a25d7d3e586b1837493361fdf8b6 , < 936206e3f6ff411581e615e930263d6f8b78df9d (git)
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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)
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            "include/net/netfilter/nf_queue.h",
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.