Bug 1929544 (CVE-2021-26930) - CVE-2021-26930 xen: Linux: error handling issues in blkback's grant mapping
Summary: CVE-2021-26930 xen: Linux: error handling issues in blkback's grant mapping
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-26930
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1929545
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 07:02:17 UTC
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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: 

https://xenbits.xen.org/xsa/advisory-365.html
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.
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