CVE-2022-0216

A use-after-free vulnerability was found in the LSI53C895A SCSI Host Bus Adapter emulation of QEMU. The flaw occurs while processing repeated messages to cancel the current SCSI request via the lsi_do_msgout function. This flaw allows a malicious privileged user within the guest to crash the QEMU process on the host, resulting in a denial of service.

Weakness

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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://access.redhat.com/security/cve/CVE-2022-0216
• https://bugzilla.redhat.com/show_bug.cgi?id=2036953
• https://gitlab.com/qemu-project/qemu/-/commit/4367a20cc4
• https://gitlab.com/qemu-project/qemu/-/issues/972
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTY7TVHX62OJWF6IOBCIGLR2N5K4QN3E/
• https://starlabs.sg/advisories/22/22-0216/
• https://access.redhat.com/security/cve/CVE-2022-0216
• https://bugzilla.redhat.com/show_bug.cgi?id=2036953
• https://gitlab.com/qemu-project/qemu/-/commit/4367a20cc4
• https://gitlab.com/qemu-project/qemu/-/issues/972
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTY7TVHX62OJWF6IOBCIGLR2N5K4QN3E/
• https://starlabs.sg/advisories/22/22-0216/