CVE-2026-43451
netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < a907bea273b60d3e604ec4e8e1f6c49954805794 (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < 0b18d1b834ab5a5009be70b530f978d7989e445b (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < b38d2b4603fd3dda24eb8b3dd81c18a0930be97b (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < 47b1c5d1b0944aa88299f55a846fabaefc756982 (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < cf4a4df38d1747e06fc54f9879bd7a6f4178032f (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < 9853d94b82d303fc4ac37d592a23a154096ecd41 (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < 208669df703a25a601f45822b10c413f258bf275 (affected, git) ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e; < f1ba83755d81c6fc66ac7acd723d238f974091e9 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.7 (affected) ≥ 0; < 4.7 (unaffected, semver) ≥ 5.10.253; ≤ 5.10.* (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.167; ≤ 6.1.* (unaffected, semver) ≥ 6.6.130; ≤ 6.6.* (unaffected, semver) ≥ 6.12.78; ≤ 6.12.* (unaffected, semver) ≥ 6.18.19; ≤ 6.18.* (unaffected, semver) ≥ 6.19.9; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794CNA: Linux
- https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445bCNA: Linux
- https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97bCNA: Linux
- https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982CNA: Linux
- https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032fCNA: Linux
- https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41CNA: Linux
- https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275CNA: Linux
- https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9CNA: Linux
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