Vulnerability · Published May 28, 2021 · Assigned by redhat

CVE-2020-35505

Medium 4.4

In plain English

A medium-severity null pointer dereference in QEMU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.4Medium

Exploit odds (30 days)0.3%top 75.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.20	qemu	6.0.0-r2	ALPINE-CVE-2020-35505
Alpine:v3.21	qemu	6.0.0-r2	ALPINE-CVE-2020-35505
Alpine:v3.22	qemu	6.0.0-r2	ALPINE-CVE-2020-35505
Alpine:v3.23	qemu	6.0.0-r2	ALPINE-CVE-2020-35505
Alpine:v3.24	qemu	6.0.0-r2	ALPINE-CVE-2020-35505
Debian:12	qemu	1:6.0+dfsg-3	DEBIAN-CVE-2020-35505
Debian:13	qemu	1:6.0+dfsg-3	DEBIAN-CVE-2020-35505
Debian:14	qemu	1:6.0+dfsg-3	DEBIAN-CVE-2020-35505

Affected products (as reported)

Vendor	Product	Versions
n/a	QEMU	qemu 6.0.0

Weakness: CWE-476

References

[oss-security] 20210416 QEMU: ESP security fixes mailing-list, x_refsource_MLIST
https://www.openwall.com/lists/oss-security/2021/04/16/3 x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=1909769 x_refsource_MISC
https://security.netapp.com/advisory/ntap-20210713-0006/ x_refsource_CONFIRM
GLSA-202208-27 vendor-advisory, x_refsource_GENTOO
[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update mailing-list, x_refsource_MLIST