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: Nobody
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: 2023-09-19 14:13 UTC (History)
42 users (show)

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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 file with capabilities from a nosuid mount into another mount. A local user could use this flaw to escalate their privileges on the system.
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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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