Bug 1796939 (CVE-2020-8428)

Summary: CVE-2020-8428 kernel: use-after-free in fs/namei.c
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, esandeen, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rt-maint, rvrbovsk, steved, williams, wmealing, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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.
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-09-24 14:41:06 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1796940    
Bug Blocks: 1796943    

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.


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):