7.8
HIGH
CVSS 3.1
CVE-2026-64340
USB: legousbtower: fix use-after-free on disconnect race
Overview
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")
Details
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Sept. 3, 2026, 4:01 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
Address use-after-free by implementing a kref for driver data.
- Use kref to manage driver data lifecycle.
- Avoid race condition during release and disconnect.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64340.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64340 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64340
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64340 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64340 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.212 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.178 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.96 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.25 up to (excluding) 5.10.261 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '11d069f85851997b4ea0adf242ed9672dc749b8f', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'b4222c05066b252b451f9c8c4730b5b60824ea66', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'ab2bfd7bec4f134b377ec42f513e90c35db94160', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '766738ecf2b819e54d38763c8d1c8ae6cff14b39', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '9ba62966461a8e3cc593b62c56ec62eb2d80436d', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '62fc8eb1b1481051f7bab4aa93d79809053dd09f', 'versionType': 'git'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '11d069f85851997b4ea0adf242ed9672dc749b8f', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'b4222c05066b252b451f9c8c4730b5b60824ea66', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'ab2bfd7bec4f134b377ec42f513e90c35db94160', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '766738ecf2b819e54d38763c8d1c8ae6cff14b39', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '9ba62966461a8e3cc593b62c56ec62eb2d80436d', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '62fc8eb1b1481051f7bab4aa93d79809053dd09f', 'versionType': 'git'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '11d069f85851997b4ea0adf242ed9672dc749b8f', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'b4222c05066b252b451f9c8c4730b5b60824ea66', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': 'ab2bfd7bec4f134b377ec42f513e90c35db94160', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '766738ecf2b819e54d38763c8d1c8ae6cff14b39', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '9ba62966461a8e3cc593b62c56ec62eb2d80436d', 'versionType': 'git'}, {'status': 'affected', 'version': '18bcbcfe9ca2308ebffb40068b51803da9315d97', 'lessThan': '62fc8eb1b1481051f7bab4aa93d79809053dd09f', 'versionType': 'git'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.25'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.25', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/misc/legousbtower.c'], 'defaultStatus': 'affected'}] Added 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") Added Reference https://git.kernel.org/stable/c/0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e Added Reference https://git.kernel.org/stable/c/11d069f85851997b4ea0adf242ed9672dc749b8f Added Reference https://git.kernel.org/stable/c/62fc8eb1b1481051f7bab4aa93d79809053dd09f Added Reference https://git.kernel.org/stable/c/6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee Added Reference https://git.kernel.org/stable/c/766738ecf2b819e54d38763c8d1c8ae6cff14b39 Added Reference https://git.kernel.org/stable/c/9ba62966461a8e3cc593b62c56ec62eb2d80436d Added Reference https://git.kernel.org/stable/c/ab2bfd7bec4f134b377ec42f513e90c35db94160 Added Reference https://git.kernel.org/stable/c/b4222c05066b252b451f9c8c4730b5b60824ea66
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.