What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 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: 2026-07-19 · updated 2026-10-30

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.

Affected products

• Linux kernel: from 4.12 before 6.1.191; from 6.2 before 6.6.160; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5 — fixed in 6.1.191, 6.6.160, 6.12.93, 6.18.35, 7.0.12
• Linux: 4.12 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 6.1.191, 6.6.160, 6.12.93, 6.18.35; Linux 7.1. Check the vendor advisory for mitigations.

References

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

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