What’s Vulnerable › Vulnerabilities

CVE-2023-54299: usb: typec: bus: verify partner exists in typec_altmode_attention

• Severity: unknown
• 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: 2025-12-30 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: bus: verify partner exists in typec_altmode_attention Some usb hubs will negotiate DisplayPort Alt mode with the device but will then negotiate a data role swap after entering the alt mode. The data role swap causes the device to unregister all alt modes, however the usb hub will still send Attention messages even after failing to reregister the Alt Mode. type_altmode_attention currently does not verify whether or not a device's altmode partner exists, which results in a NULL pointer error when dereferencing the typec_altmode and typec_altmode_ops belonging to the altmode partner. Verify the presence of a device's altmode partner before sending the Attention message to the Alt Mode driver.

Affected products

• Linux kernel: 4.19 — fixed in 6.6

How to fix

Upgrade to a fixed version: Linux kernel 6.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ad6bad31da692f8d7acacab07eabe7586239ae0
• https://git.kernel.org/stable/c/0d3b5fe47938e9c451466845304a2bd74e967a80
• https://git.kernel.org/stable/c/1101867a1711c27d8bbe0e83136bec47f8c1ca2a
• https://git.kernel.org/stable/c/38e1f2ee82bacbbfded8f1c06794a443d038d054
• https://git.kernel.org/stable/c/5f71716772b88cbe0e1788f6a38d7871aff2120b
• https://git.kernel.org/stable/c/d49547950bf7f3480d6ca05fe055978e5f0d9e5b
• https://git.kernel.org/stable/c/f23643306430f86e2f413ee2b986e0773e79da31

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