Riskcovery

CVE-2025-71108

usb: typec: ucsi: Handle incorrect num_connectors capability

State
Published
Severity
Not scored
Published
Jan 14, 2026
Updated
Oct 19, 2026
Reserved
Jan 13, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: ucsi: Handle incorrect num_connectors capability

The UCSI spec states that the num_connectors field is 7 bits, and the 8th bit is reserved and should be set to zero. Some buggy FW has been known to set this bit, and it can lead to a system not booting. Flag that the FW is not behaving correctly, and auto-fix the value so that the system boots correctly.

Found on Lenovo P1 G8 during Linux enablement program. The FW will be fixed, but seemed worth addressing in case it hit platforms that aren't officially Linux supported.

Scores

The record has no CVSS score.

Weaknesses

  • CWE-20 Improper Input Validation

Affected Products

ProductVersions
LinuxLinux
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 07c8d2a109d847775b3b4e2c3294c8e1eea75432Affected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 58941bbb0050e365a98c64f1fc4a9a0ac127dba6Affected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before f72f97d0aee4a993a35f2496bca5efd24827235dAffected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 914605b0de8128434eafc9582445306830748b93Affected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 3042a57a8e8bce4a3100c3f6f03dc372aab24943Affected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 132fe187e0d940f388f839fe2cde9b84106ad20dAffected
  • c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f to before 30cd2cb1abf4c4acdb1ddb468c946f68939819fbAffected
LinuxLinux
  • 4.13Affected
  • before 4.13Not affected
  • 5.10.248 through 5.10.*Not affected
  • 5.15.198 through 5.15.*Not affected
  • 6.1.160 through 6.1.*Not affected
  • 6.6.120 through 6.6.*Not affected
  • 6.12.64 through 6.12.*Not affected
  • 6.18.3 through 6.18.*Not affected
  • 6.19 and laterNot affected

References

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