Use-after-free in Linux kernel - CVE-2026-64233

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Main Vulnerability Database Vulnerabilities #VU139769

Use-after-free in Linux kernel - CVE-2026-64233

Published: July 27, 2026


Vulnerability identifier: #VU139769
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64233
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local privileged user to cause a use-after-free.

The vulnerability exists due to a use-after-free in uvc_function_bind() and descriptor handling for extension unit list walks when binding the UVC gadget function while concurrently removing an extension unit configfs directory. A local privileged user can bind the function and race configfs extension removal to cause a use-after-free.

Exploitation requires the ability to mount configfs and write gadget UDC files.


Affected software

Linux kernel
Ubuntu
linux-aws (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-64233

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins