The issue concerns a driver that provides raw read and write access to port I/O and MSRs via unprivileged IOCTL calls, allowing local users to gain privileges. This has been exploited in real-world incidents, including attacks by the Lazarus group, which targeted security researchers and media companies in the US and Europe. The attackers used phishing schemes, including sending malicious documents, to deploy backdoors and gain control over targeted systems. The estimated number of potentially affected devices is not specified.