Bug 1925588 (CVE-2021-26708) - CVE-2021-26708 kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c
Summary: CVE-2021-26708 kernel: race conditions caused by wrong locking in net/vmw_vso...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-26708
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: 1925948 1925595 1925599 1925600 1925601 1925602 1925603 1925949
Blocks: 1925523
TreeView+ depends on / blocked
 
Reported: 2021-02-05 15:55 UTC by Dhananjay Arunesh
Modified: 2022-04-17 21:08 UTC (History)
52 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. Wrong locking in the AF_VSOCK socket can cause a local privilege escalation, bypassing SMEP and SMAP. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-04-06 17:35:33 UTC
Embargoed:

Attachments (Terms of Use)

Description Dhananjay Arunesh 2021-02-05 15:55:38 UTC 
A vulnerability was found in Linux Kernel, where race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
Comment 1 Petr Matousek 2021-02-05 16:14:17 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1925595]
Comment 2 Petr Matousek 2021-02-05 16:14:59 UTC 
External References:

https://www.openwall.com/lists/oss-security/2021/02/04/5
Comment 5 Petr Matousek 2021-02-05 16:25:19 UTC 
Acknowledgments:

Name: Alexander Popov
Comment 7 Justin M. Forbes 2021-02-08 17:30:03 UTC 
This is fixed for Fedora with the 5.10.13 stable kernel update.
Comment 8 Eric Christensen 2021-02-09 20:23:45 UTC 
Statement:

This issue does affect the Red Hat Enterprise Linux 8 kernel versions kernel-4.18.0-240 onwards, starting with Red Hat Enterprise Linux 8.3 GA, which introduced VSOCK multi-transport support. Prior Red Hat Enterprise Linux kernel versions are not affected by this issue.
Comment 9 errata-xmlrpc 2021-04-06 13:58:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1081 https://access.redhat.com/errata/RHSA-2021:1081
Comment 10 errata-xmlrpc 2021-04-06 14:17:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1093 https://access.redhat.com/errata/RHSA-2021:1093
Comment 11 Product Security DevOps Team 2021-04-06 17:35:33 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-26708
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