Bug 1636349 (CVE-2018-17972)

Summary:	CVE-2018-17972 kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, acaringi, airlied, bhu, blc, brdeoliv, bskeggs, dbaker, dhoward, dvlasenk, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, matt, mchehab, mcressma, mjg59, mlangsdo, mvanderw, nmurray, plougher, rt-maint, rvrbovsk, slawomir, steved, sthangav, trankin, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel. An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root to inspect the kernel stack of an arbitrary task.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:39:16 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:	1642774, 1636352, 1636354, 1636355, 1638193, 1638194, 1638195, 1638196, 1638197, 1642400, 1642401, 1687728
Bug Blocks:	1636382

Description Andrej Nemec 2018-10-05 08:16:09 UTC

An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel .  An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root may inspect the kernel stack of an arbitrary task.

Upstream patch:

https://marc.info/?l=linux-fsdevel&m=153806242024956&w=2

Comment 1 Andrej Nemec 2018-10-05 08:18:16 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1636352]

Comment 6 Fedora Update System 2018-10-16 12:09:11 UTC

kernel-4.18.13-100.fc27, kernel-headers-4.18.13-100.fc27, kernel-tools-4.18.13-100.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

Comment 11 errata-xmlrpc 2019-03-13 18:46:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0514 https://access.redhat.com/errata/RHSA-2019:0514

Comment 12 errata-xmlrpc 2019-03-13 22:58:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0512 https://access.redhat.com/errata/RHSA-2019:0512

Comment 13 errata-xmlrpc 2019-04-23 14:30:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0831 https://access.redhat.com/errata/RHSA-2019:0831

Comment 14 errata-xmlrpc 2019-08-13 14:59:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2019:2473 https://access.redhat.com/errata/RHSA-2019:2473