Linux · Linux Kernel · CVE-2021-46939
**Name of the Vulnerable Software and Affected Versions**
Linux kernel (affected versions not specified)
**Description**
A vulnerability in the Linux kernel has been resolved, related to the tracing feature. The issue occurred when a fix to the ring buffer recursion detection caused a hung machine during suspend/resume testing. The problem arose from the `trace clock global()` function taking a spin lock and then trying to take it again, resulting in a dead lock. To address this, the `trace clock global()` code was restructured to never block, using a trylock to grab the lock for updating the `prev time` and retrying if it fails.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.