In the Linux kernel 5.0.21, mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c, related to dump_orphan_list in fs/ext4/super.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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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-2019-19447 | third party advisory exploit |
| https://security.netapp.com/advisory/ntap-20200103-0001/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html | third party advisory mailing list |
| http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html | third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html | third party advisory mailing list |
| https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html | third party advisory mailing list |