In the Linux kernel, the following vulnerability has been resolved: USB: ldusb: 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")

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/02ca08fff74cf9b0a3c4d2cacde1c6edeeb95bb4 cve-icon
https://git.kernel.org/stable/c/19bdfc7b3c179331eafa423d87e1336f43bbfeb8 cve-icon
https://git.kernel.org/stable/c/2107a4fc8ff1cf1d52f416c1e5cc8e97413a5915 cve-icon
https://git.kernel.org/stable/c/a3e794136ab5e3ad1e7019175a4b837aec86db4b cve-icon
https://git.kernel.org/stable/c/af59829e67e11ba2511a9f8e4b9111afc7d1f550 cve-icon
https://git.kernel.org/stable/c/d8f69404e1d671326f86d378b9f5bfbd56490e9d cve-icon
https://git.kernel.org/stable/c/e5a9bdce4bfd3e2226b5f3df5fb8385d6935ee69 cve-icon
https://git.kernel.org/stable/c/fc55923a972e715f9a27187b47d4920709e23d85 cve-icon
https://lore.kernel.org/linux-cve-announce/2026072516-CVE-2026-64343-c9e5@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-64343 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-64343 cve-icon
History

Sun, 02 Aug 2026 13:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Thu, 30 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Mon, 27 Jul 2026 06:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Sat, 25 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: USB: ldusb: 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")
Title USB: ldusb: fix use-after-free on disconnect race
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-25T08:50:05.828Z

Updated: 2026-07-25T08:50:05.828Z

Reserved: 2026-07-19T15:36:31.781Z

Link: CVE-2026-64343

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-25T00:00:00Z

Links: CVE-2026-64343 - Bugzilla