hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check before an ide_cancel_dma_sync call.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25743
Reference (s):
- http://www.openwall.com/lists/oss-security/2020/09/29/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1881409
- https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05967.html
- https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b