Vulnerability Description
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.
References
- https://git.kernel.org/stable/c/2e5fb9dd3aca0da534793ad8123b81deff396efe
- https://git.kernel.org/stable/c/40c04abcbc34e3afe338f41dae851ecbd72852ac
- https://git.kernel.org/stable/c/7939ad3b4db9eadf45a64f0524f38337a9494672
- https://git.kernel.org/stable/c/89771ce4f8f67dcffae561b2ccac95c0f6e3aa01
- https://git.kernel.org/stable/c/c13d43c92bc89f494592a60e624a7c0c42218d36
- https://git.kernel.org/stable/c/e5aa07c62e4fda1206d314c9ea36d67cd6b95cad
FAQ
What is CVE-2026-99192?
CVE-2026-99192 is a documented vulnerability. 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 contro...
How severe is CVE-2026-99192?
CVSS scoring is not yet available for CVE-2026-99192. Check NVD for updates.
Is there a patch for CVE-2026-99192?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.