Improper resource shutdown or release in Linux kernel - CVE-2026-64337
Published: July 27, 2026
Vulnerability identifier: #VU139643
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64337
CWE-ID: CWE-404
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper resource shutdown or release in the mtu3_gadget_queue() function when queuing a USB gadget request and transfer preparation fails. A local user can trigger a queue failure to cause a denial of service.
The issue occurs because a DMA mapping remains active on the failed queue path before the request is linked on the endpoint request list.
How to mitigate CVE-2026-64337
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/00c3fef4c2dc2c7cbd8281f8fda09d1913420f09
- https://git.kernel.org/stable/c/0bddda5a11665c210339de76d27ebbd1a2e0b43c
- https://git.kernel.org/stable/c/3cee30f1138281a1d247bb053a1ad4f7c5b04e98
- https://git.kernel.org/stable/c/4183874b7925f4a98b400cf857bea26ee87da236
- https://git.kernel.org/stable/c/835b0596d4c9bdef93f842d8f826978fb4956b74
- https://git.kernel.org/stable/c/8c29d9cfab1c3cf0d0b7fcdf9255597be30aa3e1
- https://git.kernel.org/stable/c/e8f739a3860d043dcc135371637e82f53132efe5
- https://git.kernel.org/stable/c/f3c4026524d3660c73ef2838b99776d37631e039