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Bug 1560968 - (CVE-2017-18249) CVE-2017-18249 kernel: Race condition in fs/f2fs/node.c:add_free_nid() function allows local users to cause denial of service
CVE-2017-18249 kernel: Race condition in fs/f2fs/node.c:add_free_nid() functi...
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=20170322,repor...
: Security
Depends On: 1563517
Blocks: 1560970
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Reported: 2018-03-27 07:30 EDT by Adam Mariš
Modified: 2018-04-05 10:20 EDT (History)
45 users (show)

See Also:
Fixed In Version: kernel 4.12
Doc Type: If docs needed, set a value
Doc Text:
The add_free_nid function in fs/f2fs/node.c in the Linux kernel, before 4.12, does not properly track an allocated nid. This allows local users to cause a denial of service (race condition) or possibly have unspecified other impacts via concurrent threads.
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Clone Of:
Environment:
Last Closed: 2018-04-05 08:22:30 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Adam Mariš 2018-03-27 07:30:07 EDT 
The add_free_nid function in fs/f2fs/node.c in the Linux kernel before 4.12 does not properly track an allocated nid, which allows local users to cause a denial of service (race condition) or possibly have unspecified other impact via concurrent threads.

Upstream patch:

https://github.com/torvalds/linux/commit/30a61ddf8117c26ac5b295e1233eaa9629a94ca3
Comment 1 Wade Mealing 2018-04-04 00:48:02 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1563517]
Comment 4 Justin M. Forbes 2018-04-04 08:51:07 EDT 
This was fixed for Fedora with the 4.12 kernel
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