Live › vulnerability › CVE-2026-99192
Go to dashboardThe bcmgenet Broadcom Ethernet driver writes its control block into a socket buffer that may still be shared and queued, so earlier transmit slots never get credited and the queue stalls until the watchdog resets it. The sources describe a denial-of-service style stall triggered by resubmitted skbs, not code execution or data theft.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-28 11:32 UTC. All times on this page are UTC.
Systems running Linux with the bcmgenet Ethernet driver, which is used on Broadcom Raspberry Pi and set-top box class hardware. The stall needs the stack to resubmit a shared skb while earlier copies are still in the ring, which the sources show with pktgen clone_skb mode. Hosts with other NICs or without bcmgenet can skip it.
No product ranges from the sources yet.
uname -r and compare against the kernel build that carries the bcmgenet unshare fix; the sources do not give a fixed version.lsmod | grep bcmgenet or ethtool -i eth0./sys/class/net/eth0/queues/tx-0/byte_queue_limits/inflight on an idle queue; a nonzero value that does not drop is the symptom described.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
net: bcmgenet: unshare the skb before writing the control block
bcmgenet stores first_cb, last_cb and bytes_sent in the skb control block and reads them back on completion to free the skb and credit BQL. ether_setup() leaves IFF_TX_SKB_SHARING set, so the stack can resubmit a shared skb that is still in the ring. The next transmit overwrites last_cb, so the earlier slots complete without crediting their bytes and BQL stalls the queue until the watchdog resets it.
Unshare the skb before writing the control block.
Reproduce with pktgen in clone_skb mode, which hands the driver the same skb while earlier copies are still in the ring:
modprobe pktgen pg=/proc/net/pktgen echo "add_device eth0" > $pg/kpktgend_0 echo "dst_mac AA:BB:CC:DD:EE:FF" > $pg/eth0 echo "dst 192.0.2.1" > $pg/eth0 echo "clone_skb 8" > $pg/eth0 echo "count 0" > $pg/eth0 echo start > $pg/pgctrl & sleep 5 echo stop > $pg/pgctrl wait cat /sys/class/net/eth0/queues/tx-0/byte_queue_limits/inflight
inflight stays nonzero on the now idle queue. clone_skb 0 leaves it at zero.
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