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Bug 1549586 - (CVE-2017-18200) CVE-2017-18200 kernel: mishandling reference counts associated with f2fs_wait_discard_bios calls allowing local attacker to cause denial of service
CVE-2017-18200 kernel: mishandling reference counts associated with f2fs_wait...
Status: CLOSED NOTABUG
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=20171001,repor...
: Security
Depends On: 1550580
Blocks: 1549588
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Reported: 2018-02-27 08:19 EST by Adam Mariš
Modified: 2018-03-13 09:36 EDT (History)
45 users (show)

See Also:
Fixed In Version: kernel 4.14
Doc Type: If docs needed, set a value
Doc Text:
The f2fs implementation in the Linux kernel, before 4.14, mishandles reference counts associated with f2fs_wait_discard_bios calls. This allows local users to cause a denial of service (BUG), as demonstrated by fstrim.
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Environment:
Last Closed: 2018-03-01 09:22:45 EST
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CRM:
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RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2018-02-27 08:19:12 EST 
The f2fs implementation in the Linux kernel before 4.14 mishandles reference counts associated with f2fs_wait_discard_bios calls, which allows local users to cause a denial of service (BUG), as demonstrated by fstrim.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=638164a2718f337ea224b747cf5977ef143166a4
Comment 2 Vladis Dronov 2018-03-01 09:16:45 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1550580]
Comment 4 Vladis Dronov 2018-03-01 09:22:45 EST 
Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as the code with the flaw is not built and shipped in the products listed.
Comment 5 Justin M. Forbes 2018-03-01 11:06:30 EST 
This was fixed in 4.14 rebases for all Fedora releases.
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