Vulnerability · Published May 28, 2021 · Assigned by redhat
CVE-2020-35506
Medium 6.7
In plain English
A medium-severity use-after-free in QEMU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.7Medium
Exploit odds (30 days)0.4%top 69.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | qemu | 6.0.0-r2 | ALPINE-CVE-2020-35506 |
| Alpine:v3.21 | qemu | 6.0.0-r2 | ALPINE-CVE-2020-35506 |
| Alpine:v3.22 | qemu | 6.0.0-r2 | ALPINE-CVE-2020-35506 |
| Alpine:v3.23 | qemu | 6.0.0-r2 | ALPINE-CVE-2020-35506 |
| Alpine:v3.24 | qemu | 6.0.0-r2 | ALPINE-CVE-2020-35506 |
| Debian:12 | qemu | 1:6.0+dfsg-3 | DEBIAN-CVE-2020-35506 |
| Debian:13 | qemu | 1:6.0+dfsg-3 | DEBIAN-CVE-2020-35506 |
| Debian:14 | qemu | 1:6.0+dfsg-3 | DEBIAN-CVE-2020-35506 |
Affected products (as reported)
Weakness: CWE-416
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=1909996 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210713-0006/ x_refsource_CONFIRM
- GLSA-202208-27 vendor-advisory, x_refsource_GENTOO