CVE-2026-90025
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the usb: typec: ucsi: displayport driver has an out-of-bounds (OOB) altmode array index. The driver indexes the connector's port altmode array with the GET_CURRENT_CAM response after checking it is not 0xff. The array is UCSI_MAX_ALTMODES elements long, so if the PPM returns an invalid response above UCSI_MAX_ALTMODES and not equal to 0xff, the kernel may crash with an OOB index error.
Risk Assessment
Can lead to a kernel crash (panic) or potential kernel-context code execution. Requires a UCSI controller returning invalid responses.
Recommendation
Update the Linux kernel to a version containing the fix that verifies current cam is less than UCSI_MAX_ALTMODES before accessing the altmode array. Until patched, avoid using affected UCSI DisplayPort controllers.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

