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Bug 1549621 - (CVE-2017-18202) CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function in mm/oom_kill.c
CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180227,repo...
: Security
Depends On: 1549622 1554355 1554356
Blocks: 1549624
  Show dependency tree / graph
 
Reported: 2018-02-27 09:02 EST by Pedro Sampaio
Modified: 2018-09-25 13:54 EDT (History)
45 users (show)

See Also:
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.
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Last Closed:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2772 None None None 2018-09-25 13:54 EDT

  None (edit)
Description Pedro Sampaio 2018-02-27 09:02:22 EST 
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 09:02:51 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1549622]
Comment 2 Justin M. Forbes 2018-02-27 10:27:13 EST 
This was fixed for fedora with the 4.14.4 stable updates.
Comment 7 errata-xmlrpc 2018-09-25 13:54:32 EDT 
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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