Bug 1929550 (CVE-2021-26931) - CVE-2021-26931 xen: Linux: backends treating grant mapping errors as bugs
Summary: CVE-2021-26931 xen: Linux: backends treating grant mapping errors as bugs
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-26931
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: 1929551
Blocks: 1924847
TreeView+ depends on / blocked
 
Reported: 2021-02-17 06:17 UTC by msiddiqu
Modified: 2021-02-17 07:02 UTC (History)
3 users (show)

Fixed In Version:
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Clone Of:
Environment:
Last Closed: 2021-02-17 07:02:26 UTC


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Description msiddiqu 2021-02-17 06:17:43 UTC
Block, net, and SCSI backends consider certain errors a plain bug,
deliberately causing a kernel crash.  For errors potentially being at
least under the influence of guests, like out of memory conditions, it
isn't correct to assume so.  Memory allocations potentially causing
such crashes occur only when Linux is running in PV mode, though.

External References:

https://xenbits.xen.org/xsa/advisory-362.html

Comment 1 msiddiqu 2021-02-17 06:18:02 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1929551]

Comment 2 Product Security DevOps Team 2021-02-17 07:02:26 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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