Medium 5.5Published May 8, 2026

CVE-2026-43451netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

Updated under an hour ago (Oct 26, 2026, 2:00 PM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before a907bea273b60d3e604ec4e8e1f6c49954805794; 8d45ff22f1b43249f0cf1baafe0262ca10d1666e builds before 0b18d1b834ab5a5009be70b530f978d7989e445b; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before b38d2b4603fd3dda24eb8b3dd81c18a0930be97b; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before 47b1c5d1b0944aa88299f55a846fabaefc756982; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before cf4a4df38d1747e06fc54f9879bd7a6f4178032f; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before 9853d94b82d303fc4ac37d592a23a154096ecd41; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before 208669df703a25a601f45822b10c413f258bf275; from 8d45ff22f1b43249f0cf1baafe0262ca10d1666e before f1ba83755d81c6fc66ac7acd723d238f974091e9	CNA record
linux linux_kernel linux:linux_kernel	from 4.7 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794	patch
https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b	patch
https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b	patch
https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982	patch
https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f	patch
https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41	patch
https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275	patch
https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.