A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error mptsas_free_request() that does not dequeue the request object 'req' from a pending requests queue. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. Versions between 2.10.0 and 5.2.0 are potentially affected.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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=1924042 | issue tracking third party advisory patch |
| https://bugs.launchpad.net/qemu/+bug/1914236 | third party advisory exploit |
| https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20210507-0001/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html | third party advisory mailing list |