Out-of-bounds read in Linux kernel - CVE-2026-64347
Published: July 27, 2026
Vulnerability identifier: #VU139638
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64347
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the USB OTG handler in composite_setup() when handling a control transfer with an empty configuration list. A remote attacker can trigger the vulnerable code path to cause a denial of service.
The issue can occur during a teardown race on gadget unbind with a control transfer in flight, or when a driver sets is_otg before adding a configuration.
Affected software
Linux kernel
How to mitigate CVE-2026-64347
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b
- https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db
- https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf
- https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483
- https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207
- https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17
- https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395
- https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1