CVE-2026-52912

Summary

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_queue: hold bridge skb->dev while queued

br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge master before queueing bridge LOCAL_IN packets. NFQUEUE only holds references on state.in/out and bridge physdevs, so a queued bridge packet can retain a freed bridge master in skb->dev until reinjection.

When the verdict is reinjected later, br_netif_receive_skb() re-enters the receive path with skb->dev still pointing at the freed bridge master, triggering a use-after-free.

Store skb->dev in the queue entry, hold a reference on it for the queue lifetime, and use the saved device when dropping queued packets during NETDEV_DOWN handling.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 950d809f154dca04e5fbe5d3c8b9c5e44769cd57affected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < a698ac8ab2561cf575d2d9f34095032651dd952eaffected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 19924bdd8a45ebc72a7b84c57fd63057d1dc75acaffected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 1e5e20031c5eee8d2e490a90ff4d6a2feecfc3beaffected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 3823c27099cfe2482299065814adbaa771be9644affected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 15d464265120ab9818bd673af301deee09bedab2affected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < 3fb0f5c0f64162a8c3f25616a4f1e340b921737faffected
LinuxLinuxac28634456867b23b95faccba7997a62ec430603 < e196115ec330a18de415bdb9f5071aa9f08e53ceaffected
LinuxLinux4.7affected
LinuxLinux0 < 4.7unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References