Linux Kernel up to 6.6.159/6.12.113/6.18.56/7.2.10 Team team_core.c team_xmit use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k1.56

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 6.6.159/6.12.113/6.18.56/7.2.10. The affected element is the function team_xmit of the file drivers/net/team/team_core.c of the component Team. The manipulation results in use after free. This vulnerability was named CVE-2026-99027. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.6.159/6.12.113/6.18.56/7.2.10. Affected is the function team_xmit of the file drivers/net/team/team_core.c of the component Team. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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 ...

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-99027 since 09/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 10/23/2026).

Upgrading to version 6.6.160, 6.12.114, 6.18.57 or 7.2.11 eliminates this vulnerability. Applying the patch b21f20320fa2f3c683e3334d70de6bfd172e544a/07a48cfceb3d0555710a9acb87c949500a7b4523/0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e/bed63353341d2d44cbad034001dd382cfe3a3892/b7454f1940c5e6d92e753853c476a769e452f30a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.160/6.12.114/6.18.57/7.2.11
Patch: b21f20320fa2f3c683e3334d70de6bfd172e544a/07a48cfceb3d0555710a9acb87c949500a7b4523/0c0568c9d35c47dc8e3ef6705d4c35a02bd88c4e/bed63353341d2d44cbad034001dd382cfe3a3892/b7454f1940c5e6d92e753853c476a769e452f30a

Timelineinfo

09/25/2026 CVE reserved
10/23/2026 +28 days Advisory disclosed
10/23/2026 +0 days VulDB entry created
10/23/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-99027 (🔒)
GCVE (CVE): GCVE-0-2026-99027
GCVE (VulDB): GCVE-100-425838

Entryinfo

Created: 10/23/2026 15:38
Changes: 10/23/2026 15:38 (60)
Complete: 🔍
Cache ID: 216::103

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