CVE-2026-99027 net: team: stop reusing skb after queue override
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99027?
CVE-2026-99027 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
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 ...
Which versions are affected by CVE-2026-99027?
How do I fix CVE-2026-99027?
Upgrade to a fixed version.
Is CVE-2026-99027 being exploited?
There is no known exploitation of CVE-2026-99027 in the wild and no public exploit code.
Sources
Also known as AZL-110885, BELL-CVE-2026-99027, DEBIAN-CVE-2026-99027, GHSA-p95p-h38v-xc33, UBUNTU-CVE-2026-99027.