# CVE-2026-99027: net: team: stop reusing skb after queue override

CVE-2026-99027 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99027, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99027
- Priority: Routine
- CVSS: 6.0 (Moderate)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99027

## 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 ...

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-99027](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99027.md) | Oct 24, 2026 |
| Linux | linux Debian 14 | 7.2.11-1 | [DEBIAN-CVE-2026-99027](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99027.md) | Oct 24, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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