Bug 1929550 (CVE-2021-26931)

Summary: CVE-2021-26931 xen: Linux: backends treating grant mapping errors as bugs
Product: [Other] Security Response Reporter: msiddiqu
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jforbes, m.a.young, robinlee.sysu
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-02-17 07:02:26 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1929551    
Bug Blocks: 1924847    

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:


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.