5.5

CVE-2025-71108: usb: typec: ucsi: Handle incorrect num_connectors capability

Modified
AliasesUBUNTU-CVE-2025-71108DEBIAN-CVE-2025-71108
Published 14-01-2026Last modified 19-10-2026

Vulnerability summary

CVE-2025-71108 is a medium (CVSS 5.5) Improper Input Validation vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 47 · Related 43
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1MGASA-2026-0017MGASA-2026-0018

Timeline

  1. 14-01-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.14% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-110.110 | < 6.17.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1052.55 | < 6.17.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 07c8d2a109d847775b3b4e2c3294c8e1eea75432 | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 58941bbb0050e365a98c64f1fc4a9a0ac127dba6 | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < f72f97d0aee4a993a35f2496bca5efd24827235d | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 914605b0de8128434eafc9582445306830748b93 | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 3042a57a8e8bce4a3100c3f6f03dc372aab24943 | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 132fe187e0d940f388f839fe2cde9b84106ad20d | ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 30cd2cb1abf4c4acdb1ddb468c946f68939819fb | 4.13
  • linux_kernel≥ 4.13.1, < 5.10.248 | ≥ 5.11, < 5.15.198 | ≥ 5.16, < 6.1.160 | ≥ 6.2, < 6.6.120 | ≥ 6.7, < 6.12.64 | ≥ 6.13, < 6.18.3 | 4.13 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6 | 6.19:rc7 | 6.19:rc8
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.3-1

3 vendors · 160 products

References

40 links
Show all 40 references