Linux Kernel up to 7.2.5 mac80211_hwsim mac80211_hwsim_stop 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-$25k0.00-

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. This impacts the function mac80211_hwsim_stop of the component mac80211_hwsim. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2026-93149. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. It has been classified as very critical. This affects the function mac80211_hwsim_stop of the component mac80211_hwsim. 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: avoid NULL skb in stop queue drain mac80211_hwsim_stop() drops any frames left in data->pending. The loop currently checks skb_queue_empty() and then dequeues separately. That split is racy with TX status handling, which can remove a pending frame under the queue lock. If the last entry is removed after the empty check, skb_dequeue() returns NULL and the stop path passes that NULL skb to ieee80211_free_txskb(). Use skb_dequeue() as the loop condition instead. The dequeue result is the object that stop owns and frees, and a concurrent status completion that empties the queue simply makes the loop terminate.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93149 since 09/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch d131027054a8dd922dda01fe8d381abe5af4970b/c40ba47f2ba1951cb32ea048667ed014d36a5749/2817431a61557f46dc63077b7cc126bc906c242e/e7fccad2c8e6ef6bbafe509c95869d161d0f466b/1c2a4ab6efa26415dd131b8c222e7893fda03435/158438cd6ad69d6dd7d871582c38baf22169fede is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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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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💳💳💳💳💳💳
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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 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: d131027054a8dd922dda01fe8d381abe5af4970b/c40ba47f2ba1951cb32ea048667ed014d36a5749/2817431a61557f46dc63077b7cc126bc906c242e/e7fccad2c8e6ef6bbafe509c95869d161d0f466b/1c2a4ab6efa26415dd131b8c222e7893fda03435/158438cd6ad69d6dd7d871582c38baf22169fede

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93149 (🔒)
GCVE (CVE): GCVE-0-2026-93149
GCVE (VulDB): GCVE-100-407229

Entryinfo

Created: 09/17/2026 23:56
Changes: 09/17/2026 23:56 (59)
Complete: 🔍
Cache ID: 216::103

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