Unrated severityNVD Advisory· Published Sep 23, 2020· Updated Aug 4, 2024
CVE-2020-25601
CVE-2020-25601
Description
An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
30- Xen/Xendescription
- osv-coords28 versionspkg:rpm/opensuse/xen&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/xen&distro=openSUSE%20Tumbleweedpkg:rpm/suse/xen&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/xen&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP1pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/xen&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/xen&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209
< 4.13.1_08-lp152.2.9.1+ 27 more
- (no CPE)range: < 4.13.1_08-lp152.2.9.1
- (no CPE)range: < 4.15.1_01-1.2
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.10.4_16-3.41.1
- (no CPE)range: < 4.10.4_16-3.41.1
- (no CPE)range: < 4.12.3_08-3.28.1
- (no CPE)range: < 4.13.1_08-3.10.1
- (no CPE)range: < 4.12.3_08-3.28.1
- (no CPE)range: < 4.13.1_08-3.10.1
- (no CPE)range: < 4.4.4_44-61.55.1
- (no CPE)range: < 4.7.6_10-43.67.1
- (no CPE)range: < 4.7.6_10-43.67.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.11.4_08-2.36.1
- (no CPE)range: < 4.12.3_08-3.24.1
- (no CPE)range: < 4.7.6_10-43.67.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.11.4_08-2.36.1
- (no CPE)range: < 4.12.3_08-3.24.1
- (no CPE)range: < 4.10.4_16-3.41.1
- (no CPE)range: < 4.12.3_08-3.24.1
- (no CPE)range: < 4.7.6_10-43.67.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.11.4_08-2.36.1
- (no CPE)range: < 4.9.4_12-3.74.1
- (no CPE)range: < 4.11.4_08-2.36.1
Patches
Vulnerability mechanics
References
7- lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.htmlmitrevendor-advisoryx_refsource_SUSE
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/mitrevendor-advisoryx_refsource_FEDORA
- security.gentoo.org/glsa/202011-06mitrevendor-advisoryx_refsource_GENTOO
- www.debian.org/security/2020/dsa-4769mitrevendor-advisoryx_refsource_DEBIAN
- xenbits.xen.org/xsa/advisory-344.htmlmitrex_refsource_MISC
News mentions
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