PT-2020-6719 · Qemu+6 · Qemu+6

CVE-2020-35505 · Published 2020-12-17 · Updated 2026-06-09

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions QEMU versions prior to 6.0.0

Description A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU. This issue occurs while handling the 'Information Transfer' command. The 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.

Recommendations For versions prior to 6.0.0, update to version 6.0.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the am53c974 SCSI host bus adapter emulation to minimize the risk of exploitation.

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2021-1767

BDU:2022-05768

CVE-2020-35505

DLA-3099-1

OESA-2021-1241

OPENSUSE-SU-2021:1202-1

OPENSUSE-SU-2021:2789-1

OPENSUSE-SU-2021:2858-1

OPENSUSE-SU-2021:3614-1

OPENSUSE-SU-2021_1202-1

OPENSUSE-SU-2021_2789-1

OPENSUSE-SU-2021_2858-1

OPENSUSE-SU-2021_3614-1

SUSE-SU-2021:2789-1

SUSE-SU-2021:2813-1

SUSE-SU-2021:2858-1

SUSE-SU-2021:3575-1

SUSE-SU-2021:3613-1

SUSE-SU-2021:3614-1

SUSE-SU-2021:3635-1

USN-5010-1

USN-8412-1

Affected Products

Alt Linux

Astra Linux

Debian

Linuxmint

Qemu

Suse

Ubuntu

References · 140

• https://ubuntu.com/security/CVE-2021-4206 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3592 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1909769 · Patch
• https://ubuntu.com/security/CVE-2020-15863 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-15469 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:3614-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3607 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8412-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-05768 · Security Note
• https://ubuntu.com/security/notices/USN-5010-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3593 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-35505 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-35505 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-12067 · Security Note
• https://ubuntu.com/security/CVE-2021-20221 · Vendor Advisory