CVE-2026-64343
Received Received - Intake

BaseFortify

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

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")

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-64343
EUVD
EUVD-2026-48887

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's ldusb USB driver. It occurs when the driver's disconnect function races with the release function, causing mutex_unlock() to access freed memory. The fix uses a kref to properly manage the driver's data lifetime.

Detection Guidance

This vulnerability is specific to the Linux kernel's ldusb driver and requires kernel-level detection. There are no standard network commands to detect it. Check kernel logs for ldusb-related errors or crashes after USB device disconnections using dmesg or journalctl.

Impact Analysis

If exploited, this could lead to system crashes, privilege escalation, or arbitrary code execution. Users might experience instability or security breaches if the vulnerable driver is in use.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. Avoid using affected USB devices until patched. Monitor kernel logs for ldusb-related issues after updates.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-64343. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart