CVE-2026-43451
Published: May 9, 2026Last modified: May 9, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.167-r0) |
| 25 LTS | linux-lts | Fixed (6.12.80-r0) | |
| Stream | linux-lts | Fixed (6.12.80-r0) |
References
- https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b
- https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275
- https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982
- https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41
- https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794
- https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b
- https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f
- https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9