Bug 1877382 (CVE-2020-25604)
| Summary: | CVE-2020-25604 xen: race when migrating timers between x86 HVM vCPU-s (XSA-336) | ||
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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 WONTFIX | 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, security-response-team, vkuznets, 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 Xen. When migrating timers of x86 HVM guests between its vCPUs, the locking model that is used allows for a second vCPU of the same guest that is also operating on the timers, to release a lock that was not acquired. The issue leads to the hypervisor hanging or crashing, resulting in a denial of service (DoS). The highest threat from this vulnerability is to system availability.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-09-22 20:41:18 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: | 1881618 | ||
| Bug Blocks: | 1877386 | ||
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Description
Guilherme de Almeida Suckevicz
2020-09-09 13:54:04 UTC
Acknowledgments: Name: the Xen project Statement: Only x86 HVM guests with more than one vCPU can exploit this vulnerability. ARM systems as well as x86 PV and PVH guests are not affected by this flaw. This flaw has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Extended Life Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/. Mitigation: There is no known mitigation for this flaw apart from applying the patch. Created xen tracking bugs for this issue: Affects: fedora-all [bug 1881618] 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-2020-25604 External References: https://xenbits.xen.org/xsa/advisory-336.html |