Linux · Linux Kernel · CVE-2021-47599
**Name of the Vulnerable Software and Affected Versions**
Linux kernel (affected versions not specified)
**Description**
The issue is related to the btrfs component of the Linux kernel and involves a problem with the `btrfs show devname()` function. The function searches for devices but finds none, leading to a warning. This occurs because `btrfs prepare sprout()` moves devices into a seed list, and `btrfs show devname()` cannot find them. The fix involves updating `latest dev` according to changes in the device list, ensuring the pointer to the device name in `/proc/self/mounts` remains valid. The RCU protection is sufficient as the device structure is freed after synchronization.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.