CVE-2026-99027
Received
Received - Intake
Use-After-Free in Linux Kernel Team Driver
Vulnerability report for CVE-2026-99027, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-23
Last updated on: 2026-10-23
Assigner: kernel.org
Description
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 ...
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 8ff5105a2b9dd0ba596719b165c1827d101e5f1a |
| Linux | Linux | 8ff5105a2b9dd0ba596719b165c1827d101e5f1a |
| Linux | Linux | 8ff5105a2b9dd0ba596719b165c1827d101e5f1a |
| Linux | Linux | 8ff5105a2b9dd0ba596719b165c1827d101e5f1a |
| Linux | Linux | 8ff5105a2b9dd0ba596719b165c1827d101e5f1a |
| Linux | Linux | 3.7 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
