A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://bugzilla.redhat.com/show_bug.cgi?id=1888726 | issue tracking patch exploit third party advisory |
| https://lkml.org/lkml/2020/10/29/528 | mailing list third party advisory patch |
| https://lkml.org/lkml/2020/10/16/84 | mailing list exploit third party advisory |
| https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html | third party advisory mailing list |
| https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html | third party advisory mailing list |
| https://www.starwindsoftware.com/security/sw-20210325-0006/ | third party advisory |