CVE-2026-43451

MEDIUM EPSS 2.4%

Published May 8, 20261mo ago · Modified Jun 17, 20261w ago

5.5 CVSS 3.1

Medium

Published May 8, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue entry from the queue data structures, taking ownership of the entry. For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN attributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN present but NFQA_VLAN_TCI missing), the function returns immediately without freeing the dequeued entry or its sk_buff. This leaks the nf_queue_entry, its associated sk_buff, and all held references (net_device refcounts, struct net refcount). Repeated triggering exhausts kernel memory. Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict on the error path, consistent with other error handling in this file.

CVSS Details

Base Score

5.5

Exploitability

1.8

Impact

3.6

Vector string

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

Attack Vector Local

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

2.4% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 1

CWE-401

Affected Products 10

Vendor	Product	Version	Range
linux	linux_kernel	*	≥4.7 – <5.10.253
linux	linux_kernel	*	≥5.11 – <5.15.203
linux	linux_kernel	*	≥5.16 – <6.1.167
linux	linux_kernel	*	≥6.2 – <6.6.130
linux	linux_kernel	*	≥6.7 – <6.12.78
linux	linux_kernel	*	≥6.13 – <6.18.19
linux	linux_kernel	*	≥6.19 – <6.19.9
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any

References 8

git.kernel.org https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b

Patch
git.kernel.org https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275

Patch
git.kernel.org https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982

Patch
git.kernel.org https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41

Patch
git.kernel.org https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794

Patch
git.kernel.org https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b

Patch
git.kernel.org https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f

Patch
git.kernel.org https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9

Patch

Remediation

git.kernel.org https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b

Patch
git.kernel.org https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275

Patch
git.kernel.org https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982

Patch
git.kernel.org https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41

Patch
git.kernel.org https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794

Patch
git.kernel.org https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b

Patch
git.kernel.org https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f

Patch
git.kernel.org https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9

Patch