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Bug 1439087 - (CVE-2014-9922) CVE-2014-9922 kernel: Privilege escalation in eCryptfs subsystem via a large filesystem stack
CVE-2014-9922 kernel: Privilege escalation in eCryptfs subsystem via a large ...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20141024,repor...
: Security
Depends On: 1446439 1446440 1446441 1446442 1446443
Blocks: 1439088
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Reported: 2017-04-05 04:15 EDT by Andrej Nemec
Modified: 2018-08-28 18:15 EDT (History)
37 users (show)

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A flaw was discovered in the way the kernel allows stackable filesystems to overlay. A local attacker who is able to mount filesystems can abuse this flaw to escalate privileges.
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Description Andrej Nemec 2017-04-05 04:15:35 EDT 
The eCryptfs subsystem in the Linux kernel allows local users to gain privileges via layering a large filesystem stack that includes an overlayfs layer, related to fs/ecryptfs/main.c and fs/overlayfs/super.c.

Upstream patch:

https://github.com/torvalds/linux/commit/69c433ed2ecd2d3264efd7afec4439524b319121

References:

http://source.android.com/security/bulletin/2017-04-01.html
Comment 1 Wade Mealing 2017-04-27 22:03:26 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6. 

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7, MRG-2. This has been rated as having Moderate security impact and is  planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
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