CVE-2026-99027

net: team: stop reusing skb after queue override

State: Published
Severity: Not scored
Published: Oct 23, 2026
Updated: Oct 30, 2026
Reserved: Sep 25, 2026

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 ...

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 13be794844e368b4f8e8d33e97efa23c0a1ebaf8Affected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before e40846f661075c4c653988363f38e6868bd0a240Affected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before eaf49fba9cd054e84906d2416e8662194f763c9eAffected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before b21f20320fa2f3c683e3334d70de6bfd172e544aAffected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 07a48cfceb3d0555710a9acb87c949500a7b4523Affected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4eAffected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before bed63353341d2d44cbad034001dd382cfe3a3892Affected 8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before b7454f1940c5e6d92e753853c476a769e452f30aAffected
LinuxLinux	3.7Affected before 3.7Not affected 5.10.273 through 5.10.Not affected 5.15.224 through 5.15.Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.57 through 6.18.Not affected 7.2.11 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 13be794844e368b4f8e8d33e97efa23c0a1ebaf8Affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before e40846f661075c4c653988363f38e6868bd0a240Affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before eaf49fba9cd054e84906d2416e8662194f763c9eAffected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before b21f20320fa2f3c683e3334d70de6bfd172e544aAffected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 07a48cfceb3d0555710a9acb87c949500a7b4523Affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before 0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4eAffected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before bed63353341d2d44cbad034001dd382cfe3a3892Affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a to before b7454f1940c5e6d92e753853c476a769e452f30aAffected

LinuxLinux

3.7Affected
before 3.7Not affected
5.10.273 through 5.10.*Not affected
5.15.224 through 5.15.*Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.57 through 6.18.*Not affected
7.2.11 through 7.2.*Not affected
7.3 and laterNot affected

References

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