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Bug 1631045 - (CVE-2018-9517) CVE-2018-9517 kernel: l2tp: Race condition between pppol2tp_session_create() and l2tp_eth_create()
CVE-2018-9517 kernel: l2tp: Race condition between pppol2tp_session_create() ...
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=20180914,repor...
: Security
Depends On: 1637904 1637905 1637906 1631046 1631048 1631049
Blocks: 1631047
  Show dependency tree / graph
 
Reported: 2018-09-19 15:51 EDT by Pedro Sampaio
Modified: 2018-10-24 14:58 EDT (History)
48 users (show)

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Doc Text:
A race condition between pppol2tp_session_create() and l2tp_eth_create() in net/l2tp/l2tp_netlink.c was found in the Linux kernel. Calling l2tp_tunnel_find() may result in a new tunnel being created with tunnel id of a previously removed tunnel which wouldn't be protected by the reference counter.
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RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2018-09-19 15:51:40 EDT 
A race condition between pppol2tp_session_create() and l2tp_eth_create() in net/l2tp/l2tp_netlink.c in the Linux kernel. Calling l2tp_tunnel_find() may result in a new tunnel being created with tunnel id of a previous removed tunnel which wouldn't be protected by the reference counter.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f026bc29a8e093edfbb2a77700454b285c97e8ad
Comment 1 Pedro Sampaio 2018-09-19 15:52:50 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1631046]
Comment 3 Justin M. Forbes 2018-09-20 08:59:26 EDT 
This was fixed for Fedora with the 4.14 rebases.
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