VulnerabilityPublished 14 Jan 2026Updated 19 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f72f97d0aee4a993a35f2496bca5efd24827235d : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS

0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-06-10.

Patch

Available – fixed in f72f97d0aee4a993a35f2496bca5efd24827235d, 914605b0de8128434eafc9582445306830748b93, 58941bbb0050e365a98c64f1fc4a9a0ac127dba6 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < f72f97d0aee4a993a35f2496bca5efd24827235d	Fixed in f72f97d0aee4a993a35f2496bca5efd24827235d
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 914605b0de8128434eafc9582445306830748b93	Fixed in 914605b0de8128434eafc9582445306830748b93
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 58941bbb0050e365a98c64f1fc4a9a0ac127dba6	Fixed in 58941bbb0050e365a98c64f1fc4a9a0ac127dba6
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 3042a57a8e8bce4a3100c3f6f03dc372aab24943	Fixed in 3042a57a8e8bce4a3100c3f6f03dc372aab24943
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 132fe187e0d940f388f839fe2cde9b84106ad20d	Fixed in 132fe187e0d940f388f839fe2cde9b84106ad20d
LinuxLinux	Affected ≥ c1b0bc2dabfa884dea49c02adaf3cd6b52b33d2f, < 30cd2cb1abf4c4acdb1ddb468c946f68939819fb	Fixed in 30cd2cb1abf4c4acdb1ddb468c946f68939819fb

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.

CWE-20Improper Input Validation (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #18OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design · Attack Surface Reduction
Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build "recognizers" for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of…
Architecture and Design · Libraries or Frameworks
Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
Injection Prevention (opens in a new tab)
SQL Injection Prevention (opens in a new tab)
Injection Prevention in Java (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Server Side Include (SSI) Injection (opens in a new tab)
Cross Zone Scripting (opens in a new tab)
Command Line Execution through SQL Injection (opens in a new tab)
Object Relational Mapping Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

WeaknessesCWE-20

Technical details

References

Community reviews

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