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CVE-2026-52912 is a use-after-free vulnerability in Linux kernel Netfilter NFQUEUE handling of bridged LOCAL_IN traffic. During bridge receive processing, br_pass_frame_up() changes skb->dev from the ingress port to the bridge-master device before the packet is queued. NFQUEUE retained references to the state input/output devices and bridge physical devices, but not to the bridge-master device referenced by skb->dev. If that bridge-master device is freed while the packet awaits a verdict, later reinjection through br_netif_receive_skb() can dereference the stale skb->dev pointer. The upstream fix saves skb->dev in the NFQUEUE queue entry, holds a device reference throughout the queue entry lifetime, and uses the saved device when purging queued packets during NETDEV_DOWN processing.
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A Linux kernel netfilter/NFQUEUE use-after-free affecting queued bridge packets. The flaw arises because skb->dev was not reference-held for the lifetime of an NFQUEUE entry after bridge processing rewrote it to the bridge master; later packet reinjection could dereference a freed bridge-master device.
A Linux kernel netfilter nf_queue flaw involving the handling of a bridge skb device while queued, fixed through RHSA-2026:71329.
A Linux kernel Netfilter nf_queue flaw involving preservation of the bridge skb->dev reference while a packet is queued.
A Linux kernel Netfilter nf_queue flaw involving retention of a bridge packet buffer's device reference while the packet is queued.
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Cross-references every affected SKU, including bundled OEM variants.
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