CVE-2023-52565

What it actually does

Out-of-bounds read in the UVC video driver when a user-supplied index exceeds the allocated mask size, allowing kernel memory disclosure.

Why it matters to the business

Local attackers may read sensitive kernel memory, potentially aiding further attacks on systems running affected kernels; low exploitation likelihood but widespread kernel exposure increases patch urgency for organizations using Linux video capture.

How an attack unfolds

A local attacker identifies a UVC video device, supplies an oversized index value through the driver interface, and triggers an out-of-bounds read that leaks kernel memory contents for further analysis or chaining.

How to fix it

Upgrade the Linux kernel to version 6.1.56 or later, or apply commit 09635bf4cdd4adf2160198a6041bcc7ca46c0558; for Ubuntu 14.04 LTS systems apply package version 2.0b4-15ubuntu0.14.04.1 or newer.

How to confirm the fix worked

Confirm the running kernel version meets or exceeds the fixed releases, verify the patch commit is present in the source tree, and test driver behavior with index values beyond mask size to ensure no out-of-bounds access occurs.

Typical attack path

1. Obtain local user access on a Linux system with a UVC video device
2. Locate the vulnerable uvcvideo driver entry point
3. Craft and submit an ioctl or equivalent request containing an index larger than the mask size
4. Capture the resulting kernel memory disclosure
5. Analyze leaked data to support additional attacks

How to detect it

Review kernel logs and dmesg output for uvcvideo faults or warnings around index handling; examine audit logs for unusual local process interactions with video devices.

What your security team should do

• Apply kernel updates to fixed versions immediately on all affected systems
• Restrict local access to systems with video capture hardware until patched
• Monitor kernel logs for uvcvideo-related faults during the remediation window
• Reassess EPSS trend and re-scan after patching to confirm risk reduction