In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and unmounting can lead to a use-after-free in btrfs_queue_work in fs/btrfs/async-thread.c.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19377 | third party advisory exploit |
| https://security.netapp.com/advisory/ntap-20200103-0001/ | vdb entry third party advisory |
| https://usn.ubuntu.com/4367-1/ | third party advisory vendor advisory |
| https://usn.ubuntu.com/4369-1/ | third party advisory vendor advisory |
| https://usn.ubuntu.com/4414-1/ | third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html | third party advisory mailing list |