CVE-2026-43084 Details
Description
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.
A use-after-free vulnerability has been identified in the Linux kernel's netfilter component, specifically within the nfnetlink_queue subsystem. This issue arises from the management of a global hash table shared among all queues, which can lead to a crash. The vulnerability occurs because the nf_queue_entry structure is freed using kfree, while a parallel CPU may still access this entry when traversing the list, causing a use-after-free condition. The vulnerability affects several versions of the Linux kernel.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for upgrading the Linux kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/22730cb96093b5be0609063bbb1923dbecd61252 | kernel.org | Patch |
| https://git.kernel.org/stable/c/41e3652a178cb0eecd48e0e6e27fbb73a004046a | kernel.org | Patch |
| https://git.kernel.org/stable/c/936206e3f6ff411581e615e930263d6f8b78df9d | kernel.org | Patch |
| https://git.kernel.org/stable/c/9e5ebef91120d2764aefe557c3a484b6288f341f | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12.75, < 6.12.83 >= 6.18.14, < 6.18.24 >= 6.19.4, < 6.19.14 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 5, 2026 | Reanalysis | [email protected] |
| May 20, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | CVE Modified | kernel.org |
| May 6, 2026 | New CVE Received | kernel.org |