Bug 1891089 (CVE-2020-27674)
| Summary: | CVE-2020-27674 xen: x86 PV guest INVLPG-like flushes may leave stale TLB entries (XSA-286) | ||
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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: | low | Docs Contact: | |
| Priority: | low | ||
| 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 flaw was found in the Xen hypercalls with INVLPG-like behavior used by x86 PV guests to invalidate TLB entries. This flaw allows a malicious unprivileged guest user to escalate their privileges to the kernel level within the guest.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-11-02 20:21:20 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: | 1891092 | ||
| Bug Blocks: | 1891100 | ||
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Description
Guilherme de Almeida Suckevicz
2020-10-23 18:48:13 UTC
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1891092] Acknowledgments: Name: the Xen project External References: https://xenbits.xen.org/xsa/advisory-286.html Upstream fix: https://xenbits.xen.org/xsa/xsa286-unstable/0001-x86-pv-Drop-FLUSH_TLB_GLOBAL-in-do_mmu_update-for-XP.patch https://xenbits.xen.org/xsa/xsa286-unstable/0002-x86-pv-Flush-TLB-in-response-to-paging-structure-cha.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-2020-27674 Mitigation: There is no known mitigation for this flaw apart from applying the patch. Statement: This flaw has been rated as having a security impact of Low, 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 the 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/. |