Bug 1891096 (CVE-2020-27672)
| Summary: | CVE-2020-27672 xen: x86: race condition in Xen mapping code (XSA-345) | ||
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| Product: | [Other] Security Response | Reporter: | Guilherme de Almeida Suckevicz <gsuckevi> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED NOTABUG | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | acaringi, ailan, bhu, bmasney, brdeoliv, dhoward, drjones, dvlasenk, fhrbata, hkrzesin, imammedo, jforbes, jshortt, jstancek, knoel, m.a.young, mrezanin, nmurray, pbonzini, ptalbert, robinlee.sysu, rvrbovsk, vkuznets, walters, xen-maint |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
A race condition flaw was found in the Xen code responsible for handling the updating of the hypervisor's own page tables. This flaw allows a malicious guest to cause a denial of service, host data corruption, or potential privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-11-02 20:21:30 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1891097 | ||
| Bug Blocks: | 1891100 | ||
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Description
Guilherme de Almeida Suckevicz
2020-10-23 19:00:15 UTC
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1891097] Acknowledgments: Name: the Xen project External References: https://xenbits.xen.org/xsa/advisory-345.html Upstream fix: https://xenbits.xen.org/xsa/xsa345/0001-x86-mm-Refactor-map_pages_to_xen-to-have-only-a-sing.patch https://xenbits.xen.org/xsa/xsa345/0002-x86-mm-Refactor-modify_xen_mappings-to-have-one-exit.patch https://xenbits.xen.org/xsa/xsa345/0003-x86-mm-Prevent-some-races-in-hypervisor-mapping-upda.patch This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-27672 Statement: All Xen versions from 3.2 onwards are vulnerable. Red Hat Enterprise Linux 5 is not affected by this flaw, as it shipped with an older version of Xen. Mitigation: Running all guests in HVM or PVH mode, in each case with HAP enabled, will prevent those guests from exploiting the vulnerability. |