A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 |
|---|---|
| http://www.openwall.com/lists/oss-security/2020/11/05/2 | mailing list exploit third party advisory |
| http://www.openwall.com/lists/oss-security/2020/11/20/5 | 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.openwall.com/lists/oss-security/2020/11/05/2%2C | |
| https://www.openwall.com/lists/oss-security/2020/11/20/5%2C | |
| https://github.com/torvalds/linux/commit/77e70d351db7de07a46ac49b87a6c3c7a60fca7e | third party advisory patch |
| https://security.netapp.com/advisory/ntap-20210702-0006/ | third party advisory |