CVE-2026-63961 usb: typec: altmodes/displayport: validate count before reading Status Update VDO
A malicious USB device can trigger uninitialized stack data disclosure in the Linux kernel DisplayPort altmode driver.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-63961?
CVE-2026-63961 is a vulnerability in Linux, published on 19 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: altmodes/displayport: validate count before reading Status Update VDO
A broken/malicious device can send the incorrect count for a status update VDO, which will cause the kernel to read uninitialized stack data and send it off elsewhere.
Fix this up by correctly verifying the count for the update object.
Which versions are affected by CVE-2026-63961?
How do I fix CVE-2026-63961?
Apply the vendor's patch.
Is CVE-2026-63961 being exploited?
There is no known exploitation of CVE-2026-63961 in the wild and no public exploit code.
Sources
Also known as AZL-92783, BELL-CVE-2026-63961, DEBIAN-CVE-2026-63961, GHSA-m857-r6wp-m3gv, ROOT-OS-UBUNTU-2204-CVE-2026-63961, UBUNTU-CVE-2026-63961.