Live › vulnerability › CVE-2026-99027
Go to dashboardThe Linux kernel's team network driver kept using a packet buffer after the lower queue had already freed it, a use-after-free. The sources show a KASAN report with a kernel panic, and nothing on what an attacker can do beyond crashing the machine.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems that load the team driver (bonding-style link aggregation with team mode) and send traffic through an override port whose qdisc drops packets. Hosts that do not use team networking are unlikely to be exposed. The sources do not say whether unprivileged users can trigger it.
No product ranges from the sources yet.
uname -r and compare against the fixed kernel build listed by your distribution's advisorylsmod | grep teamEach 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: 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 ...
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