Bug 1796939 (CVE-2020-8428) - CVE-2020-8428 kernel: use-after-free in fs/namei.c
Summary: CVE-2020-8428 kernel: use-after-free in fs/namei.c
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-8428
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: 1796940
Blocks: 1796943
TreeView+ depends on / blocked
 
Reported: 2020-01-31 15:00 UTC by Dhananjay Arunesh
Modified: 2020-09-24 14:41 UTC (History)
47 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel. The may_create_in_sticky in fs/namei.c function has a possible use-after-free which can allow a local user to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2020-09-24 14:41:06 UTC


Attachments (Terms of Use)

Description Dhananjay Arunesh 2020-01-31 15:00:10 UTC
A vulnerability was found in may_create_in_sticky in fs/namei.c of Linux kernel which has a possible use-after-free. This can allow a local user to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory. One attack vector may be an open system call for a UNIX domain socket if the socket file is being moved to a new parent directory and its old parent directory is being removed.

At this time no Red Hat products are affected by this flaw.

Reference:
http://www.openwall.com/lists/oss-security/2020/01/28/4
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0cb50185ae942b03c4327be322055d622dc79f6
https://github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6
https://www.openwall.com/lists/oss-security/2020/01/28/2

Comment 1 Dhananjay Arunesh 2020-01-31 15:00:40 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1796940]

Comment 2 Justin M. Forbes 2020-02-03 22:35:24 UTC
This was fixed for Fedora with the 5.4.16 stable kernel updates.

Comment 5 Wade Mealing 2020-02-04 02:40:30 UTC
I have requested a backport of the security feature here: https://bugzilla.redhat.com/show_bug.cgi?id=1797843 for Red Hat Enterprise Linux 8.

Comment 6 Wade Mealing 2020-02-07 03:28:41 UTC
Just to be clear, Red Hat Enterprise 8 is -not- affected by this flaw, the security feature has the flaw.

Comment 8 Product Security DevOps Team 2020-09-24 14:41:06 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-2020-8428


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