Time-of-check Time-of-use (TOCTOU) The advisory has been revoked - it doesn't affect any version of package qemu-img (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL8-QEMUIMG-1880429
- published1 Nov 2021
- disclosed14 Jan 2021
Introduced: 14 Jan 2021
CVE-2021-20181 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream qemu-img package and not the qemu-img package as distributed by RHEL.
A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
References
- https://security.netapp.com/advisory/ntap-20210720-0009/
- https://access.redhat.com/security/cve/CVE-2021-20181
- https://bugzilla.redhat.com/show_bug.cgi?id=1927007
- https://www.zerodayinitiative.com/advisories/ZDI-21-159/
- https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html