CVE-2026-99027

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

net: team: stop reusing skb after queue override

A nonzero dev queue xmit() result does not return ownership of the skb. When an override port's qdisc drops it, the queue override helper used to try another port or the mode transmit op with the freed skb.

Return the handoff decision separately from transmit success. Select only the first override port under RCU and stop after handing it the skb, regardless of the lower transmit result. Keep the existing success and drop accounting.

BUG: KASAN: slab-use-after-free in sk skb reason drop Write of size 4 by task poc/5040 sk skb reason drop (net/core/skbuff.c:1240) dev kfree skb any reason (net/core/dev.c:3470) ab transmit (drivers/net/team/team mode activebackup.c:49) team xmit (drivers/net/team/team core.c:1849) dev direct xmit (net/core/dev.c:4934) Freed by task 5040: tcf kfree skb list (net/sched/sch generic.c:43) dev queue xmit (net/core/dev.c:4831) team xmit (drivers/net/team/team core.c:1846) Kernel panic - not syncing: KASAN: panic on warn set ...