CVE-2026-64340 Details
Description
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")
A use-after-free vulnerability has been identified in the USB legousbtower driver of the Linux kernel. This issue arises during the disconnection process, where the mutex_unlock() function can inadvertently access the mutex structure after the lock has been released. This behavior creates a race condition that the current mutex management cannot handle properly, unlike spinlocks or reference counts. The vulnerability is present in the stable versions of the Linux kernel.
The vulnerability has been fixed in the Linux kernel. Users should upgrade to the latest stable version.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e | kernel.org | Patch |
| https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f | kernel.org | Patch |
| https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f | kernel.org | Patch |
| https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee | kernel.org | Patch |
| https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d | kernel.org | Patch |
| https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.25, < 5.10.261 >= 5.11, < 5.15.212 >= 5.16, < 6.1.178 >= 6.2, < 6.6.145 >= 6.7, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 7.2 rc1 7.2 rc2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |