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

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

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

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