Bug 1877383 (CVE-2020-25598)
| Summary: | CVE-2020-25598 xen: missing unlock in XENMEM_acquire_resource error path (XSA-334) | ||
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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, 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 security flaw was found in Xen. This flaw allows a buggy or malicious HVM subdomain to cause an RCU reference to be leaked. This issue causes subsequent administration operations on the host to livelock, 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 20:41:22 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: | 1881616 | ||
| Bug Blocks: | 1877386 | ||
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Description
Guilherme de Almeida Suckevicz
2020-09-09 14:01:03 UTC
Acknowledgments: Name: the Xen project Statement: This issue can generally only be exploited by x86 HVM guests, as these are the only type of VM which have a QEMU stubdomain. x86 PV and PVH domains, as well as ARM guests typically don't use a stubdomain. Additionally, VMs using PV stubdomains or with emulators running in dom0 cannot exploit the vulnerability. Xen 4.14 and later versions are vulnerable to this flaw. Red Hat Enterprise Linux 5 is not affected, as it shipped an older version of Xen which did not include the buggy code path. Mitigation: Reconfiguring x86 HVM guests to use a PV or no stubdomain will mitigate the vulnerability. Created xen tracking bugs for this issue: Affects: fedora-all [bug 1881616] 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-2020-25598 External References: https://xenbits.xen.org/xsa/advisory-334.html |