Bug 1929544 (CVE-2021-26930)

Summary: CVE-2021-26930 xen: Linux: error handling issues in blkback's grant mapping
Product: [Other] Security Response Reporter: msiddiqu
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Severity: high Docs Contact:
Priority: high    
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
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Clone Of: Environment:
Last Closed: 2021-02-17 07:02:17 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: 1929545    
Bug Blocks: 1924847    

Description msiddiqu 2021-02-17 06:16:27 UTC
To service requests, the driver maps grant references provided by the
frontend.  In this process, errors may be encountered.  In one case an
error encountered earlier might be discarded by later processing,
resulting in the caller assuming successful mapping, and hence
subsequent operations trying to access space that wasn't mapped.  In
another case internal state would be insufficiently updated, preventing
safe recovery from the error.

External References: 


Comment 1 msiddiqu 2021-02-17 06:16:47 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1929545]

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