Bug 1441093 (CVE-2017-7618)

Summary:	CVE-2017-7618 kernel: Infinite recursion in ahash.c by triggering EBUSY on a full queue
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A vulnerability was found in crypto/ahash.c in the Linux kernel which allows attackers to cause a denial of service (API operation calling its own callback, and infinite recursion) by triggering EBUSY on a full queue.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-04-24 12:04:22 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:	1441095, 1443983
Bug Blocks:	1441099

Description Andrej Nemec 2017-04-11 08:23:28 UTC

crypto/ahash.c in the Linux kernel allows attackers to cause a denial of service (API operation calling its own callback, and infinite recursion) by triggering EBUSY on a full queue.

Initial discussion:

https://www.spinics.net/lists/linux-crypto/msg25101.html

http://marc.info/?t=149181406700001&r=1&w=2

http://marc.info/?t=149181666400002&r=1&w=2

Proposed patch:

http://marc.info/?l=linux-crypto-vger&m=149181655623850&w=2

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef0579b64e93188710d48667cb5e014926af9f1b

Comment 1 Andrej Nemec 2017-04-11 08:26:31 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1441095]

Comment 4 Vladis Dronov 2017-04-24 12:04:22 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2 as the code where the flaw was found is not present in these products.