Bug 2009704 (CVE-2021-3847) - CVE-2021-3847 kernel: low-privileged user privileges escalation
Summary: CVE-2021-3847 kernel: low-privileged user privileges escalation
Keywords:
Status: NEW
Alias: CVE-2021-3847
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: 2011439 2011440 2011441 2014278
Blocks: 2009706 2009708
TreeView+ depends on / blocked
 
Reported: 2021-10-01 11:48 UTC by Marian Rehak
Modified: 2022-06-04 08:04 UTC (History)
47 users (show)

Fixed In Version:
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Doc Text:
An unauthorized access to the execution of the setuid file with capabilities flaw in the Linux kernel OverlayFS subsystem was found in the way user copying a capable file from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.
Clone Of:
Environment:
Last Closed:


Attachments (Terms of Use)

Description Marian Rehak 2021-10-01 11:48:36 UTC
An attacker with a low-privileged user on a Linux machine with an overlay mount which has a file capability in one of its layers may escalate his privileges up to root when copying a capable file from a nosuid mount into another mount.

Comment 7 Guilherme de Almeida Suckevicz 2021-10-14 19:32:25 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2014278]


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