EUVD-2026-28757
GHSA-hx98-q4r6-mgcv
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Repeated memory exhaustion in the Linux kernel's netfilter nfnetlink_queue subsystem allows a local low-privileged attacker to trigger a denial of service by leaking kernel memory on every crafted PF_BRIDGE verdict. The defect in nfqnl_recv_verdict() causes the nf_queue_entry, its sk_buff, and all held net_device and struct net reference counts to never be released when nfqa_parse_bridge() returns an error due to malformed VLAN netlink attributes. …
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