Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3 wcn36xx wcn36xx_dxe_deinit use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.25

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3. This vulnerability affects the function wcn36xx_dxe_deinit of the component wcn36xx. The manipulation leads to use after free. This vulnerability is documented as CVE-2026-98192. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.111/6.18.53/7.2.7/7.3-rc3 and classified as very critical. This issue affects the function wcn36xx_dxe_deinit of the component wcn36xx. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown wcn36xx_dxe_deinit() tears down the TX ack timer with timer_delete(), which only dequeues the timer and does not wait for a callback that is already executing; the preceding free_irq() calls synchronize the interrupt handlers only. The callback, wcn36xx_dxe_tx_timer(), can therefore be running past the teardown and use the wcn freed along with the ieee80211_hw in wcn36xx_remove(): it takes wcn->dxe_lock, reads wcn->tx_ack_skb and passes wcn->hw to ieee80211_tx_status_irqsafe(). Fix this by using timer_shutdown_sync(), which waits for a running callback and also prevents the timer from being rearmed again. The timer is set up again by wcn36xx_dxe_init() on the next start, so the start/stop cycle is unaffected. This issue was found by an in-house static analysis tool.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-98192 since 09/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/07/2026).

Upgrading to version 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 3edabc965bcce49cbb2ec1c2b91f8a555a8ec8bd/2bddc5d088cf430ecd913020472f1def32a36a3d/c0df0878e9110909cf0bec6080d72d36401a0c89/d9be5e75530772fc31637070d51e5717d6aeaa2a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3743). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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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

EPSS Score: 🔒
EPSS Percentile: 🔒

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 6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 3edabc965bcce49cbb2ec1c2b91f8a555a8ec8bd/2bddc5d088cf430ecd913020472f1def32a36a3d/c0df0878e9110909cf0bec6080d72d36401a0c89/d9be5e75530772fc31637070d51e5717d6aeaa2a

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/07/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98192 (🔒)
GCVE (CVE): GCVE-0-2026-98192
GCVE (VulDB): GCVE-100-414131
CERT Bund: WID-SEC-2026-3743 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/06/2026 13:01
Updated: 10/07/2026 08:58
Changes: 10/06/2026 13:01 (59), 10/07/2026 08:58 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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