netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
Summary
| CVE | CVE-2026-43451 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:57 UTC |
| Updated | 2026-05-08 15:16:57 UTC |
| 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.070210000 (date 2026-05-11)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e a907bea273b60d3e604ec4e8e1f6c49954805794 git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e 0b18d1b834ab5a5009be70b530f978d7989e445b git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e b38d2b4603fd3dda24eb8b3dd81c18a0930be97b git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e 47b1c5d1b0944aa88299f55a846fabaefc756982 git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e cf4a4df38d1747e06fc54f9879bd7a6f4178032f git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e 9853d94b82d303fc4ac37d592a23a154096ecd41 git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e 208669df703a25a601f45822b10c413f258bf275 git | Not specified |
| CNA | Linux | Linux | affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e f1ba83755d81c6fc66ac7acd723d238f974091e9 git | Not specified |
| CNA | Linux | Linux | affected 4.7 | Not specified |
| CNA | Linux | Linux | unaffected 4.7 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.