Deadlock in Linux kernel - CVE-2026-89732
Published: September 12, 2026
Vulnerability identifier: #VU149075
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89732
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a deadlock in ffs_ep0_read() in the FunctionFS USB gadget function when a userspace daemon repeatedly reads ep0 while the gadget is asynchronously torn down via configfs. A local user can repeatedly read ep0 during asynchronous gadget teardown to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-89732
Install security update from vendor's repository.