netfilter: nfnetlink_queue: make hash table per queue

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Summary

CVECVE-2026-43084
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 10:16:21 UTC
Updated2026-05-08 13:16:38 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000130000 probability, percentile 0.023990000 (date 2026-05-12)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 371de2bef6582a3f58049b3d18e190924af9c9a0 22730cb96093b5be0609063bbb1923dbecd61252 git Not specified
CNA Linux Linux affected 870e3e63da8e88daffe9d692a025c711658018a8 41e3652a178cb0eecd48e0e6e27fbb73a004046a git Not specified
CNA Linux Linux affected 70e2e3ce4f6841e12ec1c104fc76c0e707398ec4 9e5ebef91120d2764aefe557c3a484b6288f341f git Not specified
CNA Linux Linux affected e19079adcd26a25d7d3e586b1837493361fdf8b6 936206e3f6ff411581e615e930263d6f8b78df9d git Not specified
CNA Linux Linux affected 6.12.75 6.12.83 semver Not specified
CNA Linux Linux affected 6.18.14 6.18.24 semver Not specified
CNA Linux Linux affected 6.19.4 6.19.14 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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