Bug 1933737 (CVE-2020-27067) - CVE-2020-27067 kernel: use after free due to a race condition may lead to local escalation of privilege
Summary: CVE-2020-27067 kernel: use after free due to a race condition may lead to loc...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-27067
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: 1933738 1940645 1940647 1940648
Blocks: 1933739
TreeView+ depends on / blocked
 
Reported: 2021-03-01 15:24 UTC by Marian Rehak
Modified: 2021-11-09 15:39 UTC (History)
43 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-11-09 15:39:23 UTC
Embargoed:

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Description Marian Rehak 2021-03-01 15:24:35 UTC 
In the l2tp subsystem, there is a possible use after free due to a race condition, which could lead to local escalation of privilege with System execution privileges needed.

Reference:

https://source.android.com/security/bulletin/pixel/2020-12-01
Comment 1 Marian Rehak 2021-03-01 15:25:38 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1933738]
Comment 2 Justin M. Forbes 2021-03-02 14:09:10 UTC 
This was fixed for Fedora with the 4.13.6 stable kernel updates.
Comment 5 Alex 2021-03-18 19:07:56 UTC 
Mitigation:

To mitigate this issue, prevent the module l2tp_core from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.
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