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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net: team: 停止在队列覆盖后重复使用 skb 当 返回非零结果时，并不会收回 skb（套接字缓冲区）的所有权。此前，如果某个覆盖端口（override port）的 qdisc（队列调度器）丢弃了该 skb，队列覆盖辅助函数仍会尝试将已释放的 skb 传递给另一个端口，或交由模式传输操作（mode transmit op）处理。 修复方案如下： 将“移交决策”（handoff decision）与“传输成功”的结果分离返回； 在 RCU（读拷贝更新）保护下仅选

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1069.001 · Local Groups

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 8ff5105a2b9dd0ba596719b165c1827d101e5f1a< b21f20320fa2f3c683e3334d70de6bfd172e544a affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a< 07a48cfceb3d0555710a9acb87c949500a7b4523 affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a< 0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a< bed63353341d2d44cbad034001dd382cfe3a3892 affected
8ff5105a2b9dd0ba596719b165c1827d101e5f1a< b7454f1940c5e6d92e753853c476a769e452f30a affected
3.7 affected
< 3.7 unaffected
6.6.160≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-99027

Vulnerability Information
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Vulnerability Title
net: team: stop reusing skb after queue override
Source: CVE Program / CVE List V5
Vulnerability 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 ...
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8ff5105a2b9dd0ba596719b165c1827d101e5f1a ~ b21f20320fa2f3c683e3334d70de6bfd172e544a -
Linux Linux 3.7 -

II. Public POCs for CVE-2026-99027

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III. Intelligence Information for CVE-2026-99027

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Patches & Fixes for CVE-2026-99027 (3)

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959 9.8 CRITICAL btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079 9.8 CRITICAL net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988 8.8 HIGH namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083 8.8 HIGH ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082 8.8 HIGH KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98870 8.8 HIGH ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980 8.8 HIGH namei: don't reveal overmounted entries in refwalk
CVE-2026-98981 8.8 HIGH namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042 8.4 HIGH io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978 8.4 HIGH namespace: never expire a locked mount
CVE-2026-99064 8.1 HIGH cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968 8.1 HIGH amt: send the relay's General Query directly from the receive path
CVE-2026-98899 7.8 HIGH netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99018 7.8 HIGH riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99002 7.8 HIGH drm/vmwgfx: validate pitch coming from userspace
CVE-2026-99016 7.8 HIGH riscv: futex: untag the user pointer before the atomic access
CVE-2026-99051 7.8 HIGH fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99032 7.8 HIGH net/smc: protect clcsock lifetime in smc_getname
CVE-2026-98999 7.8 HIGH drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin

Showing top 20 of 217 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux