Linux Kernel up to 7.2-rc2 legousbtower mutex_unlock use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 7.2-rc2. Impacted is the function mutex_unlock of the component legousbtower. The manipulation leads to use after free. This vulnerability is referenced as CVE-2026-64340. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2 and classified as very critical. This issue affects the function mutex_unlock of the component legousbtower. 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: USB: legousbtower: fix use-after-free on disconnect race mutex_unlock() may access the mutex structure after releasing the lock and therefore cannot be used to manage lifetime of objects directly (unlike spinlocks and refcounts). [1][2] Use a kref to release the driver data to avoid use-after-free in mutex_unlock() when release() races with disconnect(). [1] a51749ab34d9 ("locking/mutex: Document that mutex_unlock() is non-atomic") [2] 2b9d9e0a9ba0 ("locking/mutex: Clarify that mutex_unlock(), and most other sleeping locks, can still use the lock object after it's unlocked")

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-64340 since 07/19/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/26/2026).

The vulnerability scanner Nessus provides a plugin with the ID 329955 (Linux Distros Unpatched Vulnerability : CVE-2026-64340), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc3 eliminates this vulnerability. Applying the patch 11d069f85851997b4ea0adf242ed9672dc749b8f/b4222c05066b252b451f9c8c4730b5b60824ea66/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e/ab2bfd7bec4f134b377ec42f513e90c35db94160/766738ecf2b819e54d38763c8d1c8ae6cff14b39/9ba62966461a8e3cc593b62c56ec62eb2d80436d/62fc8eb1b1481051f7bab4aa93d79809053dd09f is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (329955). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 329955
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-64340

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc3
Patch: 11d069f85851997b4ea0adf242ed9672dc749b8f/b4222c05066b252b451f9c8c4730b5b60824ea66/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e/ab2bfd7bec4f134b377ec42f513e90c35db94160/766738ecf2b819e54d38763c8d1c8ae6cff14b39/9ba62966461a8e3cc593b62c56ec62eb2d80436d/62fc8eb1b1481051f7bab4aa93d79809053dd09f

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/26/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64340 (🔒)
GCVE (CVE): GCVE-0-2026-64340
GCVE (VulDB): GCVE-100-383135

Entryinfo

Created: 07/25/2026 16:01
Updated: 07/26/2026 16:52
Changes: 07/25/2026 16:01 (59), 07/26/2026 16:52 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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