Bug 1549621 (CVE-2017-18202) - CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function in mm/oom_kill.c
Summary: CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-18202
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1549622 1554355 1554356
Blocks: 1549624
TreeView+ depends on / blocked
 
Reported: 2018-02-27 14:02 UTC by Pedro Sampaio
Modified: 2021-06-10 14:54 UTC (History)
44 users (show)

Fixed In Version: Linux 4.14.4
Doc Type: If docs needed, set a value
Doc Text:
The __oom_reap_task_mm function in mm/oom_kill.c in the Linux kernel, before 4.14.4, mishandles gather operations. This allows attackers to cause a denial of service (TLB entry leak or use-after-free) or possibly have unspecified other impact by triggering a copy_to_user call within a certain time window.
Clone Of:
Environment:
Last Closed: 2019-06-08 03:41:35 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2772 0 None None None 2018-09-25 17:54:54 UTC

Description Pedro Sampaio 2018-02-27 14:02:22 UTC 
The __oom_reap_task_mm function in mm/oom_kill.c in the Linux kernel before 4.14.4 mishandles gather operations, which allows attackers to cause a denial of service (TLB entry leak or use-after-free) or possibly have unspecified other impact by triggering a copy_to_user call within a certain time window.

References:

https://marc.info/?t=151004877700005&r=1&w=2

An upsteam patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=687cb0884a714ff484d038e9190edc874edcf146
Comment 1 Pedro Sampaio 2018-02-27 14:02:51 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1549622]
Comment 2 Justin M. Forbes 2018-02-27 15:27:13 UTC 
This was fixed for fedora with the 4.14.4 stable updates.
Comment 7 errata-xmlrpc 2018-09-25 17:54:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2772 https://access.redhat.com/errata/RHSA-2018:2772
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