CVE-2024-42240

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the x86/bhi mitigation in the Linux kernel. When BHI mitigation is enabled and SYSENTER is invoked with the TF flag set, the entry SYSENTER compat() function uses CLEAR BRANCH HISTORY and calls clear bhb loop() before the TF flag is cleared. This causes the #DB handler (exc debug kernel()) to issue a warning because single-step is used outside the entry SYSENTER compat() function. The problem can be reproduced with a specific sequence of assembly code instructions. The kernel log shows a warning and a call trace indicating the issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.