High severity7.5NVD Advisory· Published May 13, 2021· Updated Jun 17, 2026
CVE-2021-20181
CVE-2021-20181
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
39- osv-coords34 versionspkg:rpm/opensuse/qemu&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/qemu&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/qemu-linux-user&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/qemu-testsuite&distro=openSUSE%20Leap%2015.2pkg:rpm/suse/kvm&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/kvm&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/qemu&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/qemu&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/qemu&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/qemu&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/suse/qemu&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/qemu&distro=SUSE%20Manager%20Server%204.0pkg:rpm/suse/qemu&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/qemu&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/qemu&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/qemu&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 4.2.1-lp152.9.9.2+ 33 more
- (no CPE)range: < 4.2.1-lp152.9.9.2
- (no CPE)range: < 6.1.0-32.1
- (no CPE)range: < 4.2.1-lp152.9.9.3
- (no CPE)range: < 4.2.1-lp152.9.9.5
- (no CPE)range: < 1.4.2-53.38.1
- (no CPE)range: < 1.4.2-60.34.1
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 2.11.2-9.43.1
- (no CPE)range: < 2.11.2-9.43.1
- (no CPE)range: < 4.2.1-11.13.1
- (no CPE)range: < 4.2.1-11.13.1
- (no CPE)range: < 2.6.2-41.62.1
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 2.11.2-5.29.1
- (no CPE)range: < 3.1.1.1-48.2
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 2.11.2-9.43.1
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 2.11.2-5.29.1
- (no CPE)range: < 3.1.1.1-48.2
- (no CPE)range: < 2.11.2-9.43.1
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 3.1.1.1-9.24.3
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 2.11.2-5.29.1
- (no CPE)range: < 2.9.1-6.47.1
- (no CPE)range: < 2.11.2-5.29.1
Patches
Vulnerability mechanics
References
5- bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/02/msg00024.htmlnvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlnvdMailing ListThird Party Advisory
- security.netapp.com/advisory/ntap-20210720-0009/nvdThird Party Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-159/nvdThird Party AdvisoryVDB Entry
News mentions
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