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Bug 1505905 - (CVE-2017-15102) CVE-2017-15102 kernel: NULL pointer dereference due to race condition in probe function of legousbtower driver
CVE-2017-15102 kernel: NULL pointer dereference due to race condition in prob...
Status: CLOSED CURRENTRELEASE
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160919,reported=2...
: Security
Depends On:
Blocks: 1505912
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Reported: 2017-10-24 10:24 EDT by Adam Mariš
Modified: 2017-11-07 15:34 EST (History)
46 users (show)

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Fixed In Version: kernel 4.9
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Last Closed: 2017-11-07 15:34:07 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2017-10-24 10:24:24 EDT 
Race condition in legousbtower driver exposes a null pointer dereference caused by not removing the device file interface on an error when the probe function is called. This can cause a write-what-where condition by remapping dev->interrupt_out_buffer in tower_write, leading to privilege escalation.

Upstream patch:

https://github.com/torvalds/linux/commit/2fae9e5a7babada041e2e161699ade2447a01989
Comment 2 Adam Mariš 2017-10-24 10:26:30 EDT 
Acknowledgments:

Name: James Patrick Evans
Comment 3 Vladis Dronov 2017-11-07 15:27:58 EST 
Statement:

This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2, as this flaw was fixed in 7.4 release.
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