Bug 1420276 (CVE-2017-5986)

Summary:	CVE-2017-5986 kernel: Reachable BUG_ON from userspace in sctp_wait_for_sndbuf
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, dhoward, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lxin, madhu.chinakonda, matt, mchehab, mcressma, mleitner, nmurray, pholasek, plougher, rt-maint, rvrbovsk, security-response-team, slawomir, vdronov, williams
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	It was reported that with Linux kernel, earlier than version v4.10-rc8, an application may trigger a BUG_ON in sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is waiting on it to queue more data, and meanwhile another thread peels off the association being used by the first thread.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:07:19 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1421740, 1421741, 1429493, 1429494, 1429496, 1429497, 1459305
Bug Blocks:	1420295

Description Adam Mariš 2017-02-08 10:38:40 UTC

It was reported that with Linux kernel, earlier than version v4.10-rc8, an application may trigger a BUG_ON in sctp_wait_for_sndbuf if the socket tx buffer is full, a thread is waiting on it to queue more data, and meanwhile another thread peels off the association being used by the first thread.

References:

https://lkml.org/lkml/2017/1/30/238

http://seclists.org/oss-sec/2017/q1/432

Upstream patch:

https://github.com/torvalds/linux/commit/2dcab598484185dea7ec22219c76dcdd59e3cb90

Comment 2 Adam Mariš 2017-02-09 14:19:55 UTC

Upstream patch:

https://github.com/torvalds/linux/commit/2dcab598484185dea7ec22219c76dcdd59e3cb90

Comment 6 Vladis Dronov 2017-02-13 15:02:00 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1421741]

Comment 7 Fedora Update System 2017-02-13 22:48:29 UTC

kernel-4.9.9-100.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Vladis Dronov 2017-02-14 11:48:23 UTC

Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and MRG-2. This has been rated as having Moderate 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 affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7. This flaw may affect multiple containers running on this system. Future Linux kernel updates for the respective releases might address this issue.

Comment 9 Marcelo Ricardo Leitner 2017-02-20 19:27:11 UTC

Please reconsider this at least for RHEL7. With containers, this can be pretty serious. One malicious container may bring thousands others down. Thanks

Comment 10 Marcelo Ricardo Leitner 2017-02-23 21:25:53 UTC

Btw the fix needs a follow-up
http://patchwork.ozlabs.org/patch/731526/

Comment 16 errata-xmlrpc 2017-05-25 15:39:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1308 https://access.redhat.com/errata/RHSA-2017:1308