Für das X250 gibt's ein Bios-Update. Changelog:

CHANGES IN THIS RELEASE
  Version 1.40

[Important updates]
- Address CVE-2020-0543.
  (https://cve.mitre.org//cgi-bin//cvename.cgi?name=CVE-2020-0543)
- Update includes a security fix.
- Addresses CVE-2019-6173 and CVE-2019-6196.
  (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6173)
  (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6196)
  Refer to Lenovo's Security Advisory page for additional information about
  LEN-27431 "DLL Search Path and Symbolic Link Vulnerabilities".
  (https://support.lenovo.com/us/en/product_security/LEN-27431)

[New functions or enhancements]
 Nothing.

[Problem fixes]
 Nothing.

Aktualisieren geht mit USB Stick wie sonst auch.