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Bug 1481146 - (CVE-2017-10662) CVE-2017-10662 kernel: Missing sanity check for segment count in f2fs
CVE-2017-10662 kernel: Missing sanity check for segment count in f2fs
Status: CLOSED NOTABUG
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=20170502,reported=2...
: Security
Depends On:
Blocks: 1481154
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Reported: 2017-08-14 04:35 EDT by Adam Mariš
Modified: 2017-08-31 11:58 EDT (History)
37 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the sanity_check_raw_super() function in 'fs/f2fs/super.c' file in the Linux kernel before version 4.12-rc1 does not validate the f2fs filesystem segment count. This allows an unprivileged local user to cause a system panic and DoS. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
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Environment:
Last Closed: 2017-08-27 09:34:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2017-08-14 04:35:00 EDT 
In was found that the sanity_check_raw_super() function in 'fs/f2fs/super.c' file in the Linux kernel before 4.12-rc1 does not validate the f2fs filesystem segment count, which allows an unprivileged local user to cause a system panic and DoS. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

References:

https://source.android.com/security/bulletin/2017-08-01#kernel-components

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b9dd46188edc2f0d1f37328637860bb65a771124
Comment 3 Vladis Dronov 2017-08-27 09:34:35 EDT 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2 as the code with the flaw is not built and shipped with the products listed.
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