NULL pointer dereference in Qemu
CVE-2020-35503
A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Qemu
- Fedoraproject Fedora — versions 33
- Qemu — versions All QEMU versions before and including 6.0
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20210720-0008/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-35503?
- CVE-2020-35503 is a medium-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 6.0/10. Published 2021-06-02.
- How severe is CVE-2020-35503?
- Medium severity. CVSS v3 base score is 6.0 out of 10.