Bug 1929546 (CVE-2021-26933) - CVE-2021-26933 xen: arm: The cache may not be cleaned for newly allocated scrubbed pages
Summary: CVE-2021-26933 xen: arm: The cache may not be cleaned for newly allocated scr...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-26933
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1929547
Blocks: 1924847
TreeView+ depends on / blocked
 
Reported: 2021-02-17 06:16 UTC by msiddiqu
Modified: 2021-02-17 07:02 UTC (History)
3 users (show)

Fixed In Version:
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Last Closed: 2021-02-17 07:02:20 UTC
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Description msiddiqu 2021-02-17 06:16:54 UTC 
On Arm, a guest is allowed to control whether memory access bypass the
cache.  This means that Xen needs to ensure that all writes (such as
the ones during scrubbing) have reached memory before handing over the
page to a guest.

External References:

https://xenbits.xen.org/xsa/advisory-364.html
Comment 1 msiddiqu 2021-02-17 06:17:12 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1929547]
Comment 2 Product Security DevOps Team 2021-02-17 07:02:20 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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