Bug 1777825 (CVE-2019-18660) - CVE-2019-18660 kernel: (powerpc) incomplete Spectre-RSB mitigation leads to information exposure
Summary: CVE-2019-18660 kernel: (powerpc) incomplete Spectre-RSB mitigation leads to i...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-18660
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1777686 1777710 1793856 1777826 1778342
Blocks: 1777827
TreeView+ depends on / blocked
 
Reported: 2019-11-28 12:06 UTC by msiddiqu
Modified: 2020-01-27 08:21 UTC (History)
51 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way the Linux kernel implemented a software flush of the Count Cache (indirect branch cache) and Link (Return Address) Stack on the PowerPC platform. The flushing of these structures helps to prevent SpectreRSB like attacks which may leak information from one user process to another. An unprivileged user could use this flaw to cross the syscall or process boundary and read privileged memory by conducting targeted cache side-channel attacks.
Clone Of:
Environment:
Last Closed: 2020-01-21 20:10:02 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:0174 None None None 2020-01-21 15:50:19 UTC

Description msiddiqu 2019-11-28 12:06:13 UTC
An issue was found in the way Linux kernel implemented software flush of the Count Cache (indirect branch cache) and Link (Return Address) Stack on PowerPC platform. The flushing of these structures helps to prevent SpectreRSB like attacks which may leak information from one user process to another.

An unprivileged user could use this flaw to cross the syscall or process boundary and read privileged memory by conducting targeted cache side-channel attacks.

Upstream commit: 
----------------
  -> https://git.kernel.org/linus/39e72bf96f5847ba87cc5bd7a3ce0fed813dc9ad
  -> https://git.kernel.org/linus/af2e8c68b9c5403f77096969c516f742f5bb29e0

References:
-----------
  -> https://www.openwall.com/lists/oss-security/2019/11/27/1

Comment 1 msiddiqu 2019-11-28 12:06:45 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1777826]

Comment 5 errata-xmlrpc 2020-01-21 15:50:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:0174 https://access.redhat.com/errata/RHSA-2020:0174

Comment 6 Product Security DevOps Team 2020-01-21 20:10:02 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-18660

Comment 8 Prasad J Pandit 2020-01-22 07:06:49 UTC
Statement:

This issue affects versions of the kernel package as shipped with Red Hat Enterprise Linux 6, 7 and 8. Future kernel updates for Red Hat Enterprise Linux 6, 7 and 8 may address this issue.

This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise MRG 2.


Note You need to log in before you can comment on or make changes to this bug.