NULL Pointer Dereference
CVE-2021-4145
Summary
A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions 6.1.0-rc0 through 6.1.1. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.
- LOW
- LOCAL
- NONE
- CHANGED
- NONE
- LOW
- NONE
- HIGH
CWE-476 - NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
Advisory Timeline
- Published