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CVE

CVE-2026-43084

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: make hash table per que

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.

HIGH · CVSS 7.8 EPSS 0.00015
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
Look this up elsewhere - one-click external pivots
NVDCVE.orgCISAVulnersExploit-DBGitHub PoCVulnCheck KEVGreyNoise
▸ How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-43084, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
◆

ATT&CK techniques

1

Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.

T1068 · Exploitation for Privilege Escalation
▤ Build a SIEM detection for these techniques
⬡

Weakness Classification

CWE-416Use After Free
▤

Affected Products & Versions

3
linux kernel>= 6.12.75 and < 6.12.83
linux kernel>= 6.18.14 and < 6.18.24
linux kernel>= 6.19.4 and < 6.19.14
📦

Fixed versions by distribution

51
The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
oracle allkernel-uek fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-core open
oracle allkernel-uek-debug open
oracle allkernel-uek-debug-core open
oracle allkernel-uek-debug-devel open
oracle allkernel-uek-debug-modules open
oracle allkernel-uek-debug-modules-core fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-debug-modules-deprecated fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-debug-modules-desktop open
oracle allkernel-uek-debug-modules-extra fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-debug-modules-extra-netfilter open
oracle allkernel-uek-debug-modules-usb fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-debug-modules-wireless fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-devel fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-modules open
oracle allkernel-uek-modules-core open
oracle allkernel-uek-modules-deprecated open
oracle allkernel-uek-modules-desktop fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-modules-extra open
oracle allkernel-uek-modules-extra-netfilter open
oracle allkernel-uek-modules-usb fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-modules-wireless fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-tools fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek64k fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek64k-core fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek64k-devel open
oracle allkernel-uek64k-modules open
oracle allkernel-uek64k-modules-core fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek64k-modules-deprecated open
oracle allkernel-uek64k-modules-desktop open
oracle allkernel-uek64k-modules-extra open
oracle allkernel-uek64k-modules-extra-netfilter open
oracle allkernel-uek64k-modules-usb fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek64k-modules-wireless fixed in 0:6.12.0-203.76.7.1.el10uek
suse sle15cluster-md-kmp-default open
suse sle15dlm-kmp-default open
suse sle15gfs2-kmp-default open
suse sle15kernel-default open
suse sle15kernel-default-base open
suse sle15kernel-default-devel open
suse sle15kernel-default-extra open
suse sle15kernel-default-livepatch open
suse sle15kernel-default-livepatch-devel open
suse sle15kernel-default-man open
suse sle15kernel-devel open
suse sle15kernel-devel-rt open
suse sle15kernel-macros open
suse sle15kernel-source open
suse sle15kernel-source-rt open
suse sle15ocfs2-kmp-default open
suse sle15reiserfs-kmp-default open
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 May 2026 · 10:16 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252Patch
https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046aPatch
https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9dPatch
https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341fPatch
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