Bug 1970530 (CVE-2021-0086, CVE-2021-0089, CVE-2021-26313, CVE-2021-26314) - CVE-2021-0089 CVE-2021-26313 CVE-2021-0086 CVE-2021-26314 xen: speculative code store bypass (XSA-375)
Summary: CVE-2021-0089 CVE-2021-26313 CVE-2021-0086 CVE-2021-26314 xen: speculative co...
Alias: CVE-2021-0086, CVE-2021-0089, CVE-2021-26313, CVE-2021-26314
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1970531
TreeView+ depends on / blocked
Reported: 2021-06-10 16:22 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-06-10 21:04 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2021-06-10 21:04:01 UTC

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Description Guilherme de Almeida Suckevicz 2021-06-10 16:22:27 UTC
Modern superscalar processors may employ sophisticated decoding and caching of the instruction stream to improve performance.  However, a consequence is that self-modifying code updates may not take effect instantly. Whatever the architectural guarantees, some CPUs have microarchitectural behaviour whereby the stale instruction stream may be speculatively decoded and executed. Speculation of this form can suffer from type confusion in registers, and potentially leak data.


Comment 1 Guilherme de Almeida Suckevicz 2021-06-10 16:22:45 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1970531]

Comment 2 Product Security DevOps Team 2021-06-10 21:04:01 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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