Bug 1533909 (CVE-2018-5344)

Summary:	CVE-2018-5344 kernel: drivers/block/loop.c mishandles lo_release serialization allowing denial-of-service
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:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, slawomir, steved, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the Linux kernel's handling of loopback devices. An attacker, who has permissions to setup loopback disks, may create a denial of service or other unspecified actions.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:36:58 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:	1533910, 1533911, 1541228, 1541229, 1541230, 1541231, 1541232, 1740295, 1740296, 1740297
Bug Blocks:	1533912

Description Adam Mariš 2018-01-12 14:03:33 UTC

A flaw was found in the Linux kernels handling of loopback devices where it mishandles the release (lo_release function) where an attacker who has permissions to setup loopback disks.

This may allow an attacker to cause a denial of service (__lock_acquire use-after-free) or possibly have unspecified other impact.

Upstream patch:

https://github.com/torvalds/linux/commit/ae6650163c66a7eff1acd6eb8b0f752dcfa8eba5

Comment 1 Adam Mariš 2018-01-12 14:05:42 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1533911]

Comment 8 Eric Christensen 2018-02-02 16:17:30 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2.

Future Linux kernel updates for the respective releases may address this issue.

Comment 9 errata-xmlrpc 2018-10-30 07:30:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3083 https://access.redhat.com/errata/RHSA-2018:3083

Comment 10 errata-xmlrpc 2018-10-30 07:37:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3096 https://access.redhat.com/errata/RHSA-2018:3096

Comment 11 errata-xmlrpc 2018-10-30 08:57:03 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948