Synopsis

Moderate: microcode_ctl security, bug fix and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

Updated microcode_ctl packages that fix several security bugs and add various enhancements are now available.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Security Fix(es):

• hw: Special Register Buffer Data Sampling (SRBDS) (CVE-2020-0543)
• hw: L1D Cache Eviction Sampling (CVE-2020-0549)
• hw: Vector Register Data Sampling (CVE-2020-0548)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• Update Intel CPU microcode to microcode-20200602 release, addresses:
• Update of 06-2d-06/0x6d (SNB-E/EN/EP C1/M0) microcode from revision 0x61f

up to 0x621;

• Update of 06-2d-07/0x6d (SNB-E/EN/EP C2/M1) microcode from revision 0x718

up to 0x71a;

• Update of 06-3c-03/0x32 (HSW C0) microcode from revision 0x27 up to 0x28;
• Update of 06-3d-04/0xc0 (BDW-U/Y E0/F0) microcode from revision 0x2e

up to 0x2f;

• Update of 06-45-01/0x72 (HSW-U C0/D0) microcode from revision 0x25

up to 0x26;

• Update of 06-46-01/0x32 (HSW-H C0) microcode from revision 0x1b up to 0x1c;
• Update of 06-47-01/0x22 (BDW-H/Xeon E3 E0/G0) microcode from revision 0x21

up to 0x22;

• Update of 06-4e-03/0xc0 (SKL-U/Y D0) microcode from revision 0xd6

up to 0xdc;

• Update of 06-55-03/0x97 (SKX-SP B1) microcode from revision 0x1000151

up to 0x1000157;

• Update of 06-55-04/0xb7 (SKX-SP H0/M0/U0, SKX-D M1) microcode

(in intel-06-55-04/intel-ucode/06-55-04) from revision 0x2000065
up to 0x2006906;

• Update of 06-55-06/0xbf (CLX-SP B0) microcode from revision 0x400002c

up to 0x4002f01;

• Update of 06-55-07/0xbf (CLX-SP B1) microcode from revision 0x500002c

up to 0x5002f01;

• Update of 06-5e-03/0x36 (SKL-H/S R0/N0) microcode from revision 0xd6

up to 0xdc;

• Update of 06-7e-05/0x80 (ICL-U/Y D1) microcode from revision 0x46

up to 0x78;

• Update of 06-8e-09/0x10 (AML-Y22 H0) microcode from revision 0xca

up to 0xd6;

• Update of 06-8e-09/0xc0 (KBL-U/Y H0) microcode from revision 0xca

up to 0xd6;

• Update of 06-8e-0a/0xc0 (CFL-U43e D0) microcode from revision 0xca

up to 0xd6;

• Update of 06-8e-0b/0xd0 (WHL-U W0) microcode from revision 0xca

up to 0xd6;

• Update of 06-8e-0c/0x94 (AML-Y42 V0, CML-Y42 V0, WHL-U V0) microcode

from revision 0xca up to 0xd6;

• Update of 06-9e-09/0x2a (KBL-G/H/S/X/Xeon E3 B0) microcode from revision

0xca up to 0xd6;

• Update of 06-9e-0a/0x22 (CFL-H/S/Xeon E3 U0) microcode from revision 0xca

up to 0xd6;

• Update of 06-9e-0b/0x02 (CFL-S B0) microcode from revision 0xca up to 0xd6;
• Update of 06-9e-0c/0x22 (CFL-H/S P0) microcode from revision 0xca

up to 0xd6;

• Update of 06-9e-0d/0x22 (CFL-H R0) microcode from revision 0xca up to 0xd6.
• Change the URL in the intel-microcode2ucode.8 to point to the GitHub

repository since the microcode download section at Intel Download Center
does not exist anymore.

• Narrow down SKL-SP/W/X blacklist to exclude Server/FPGA/Fabric segment

models.

• Re-generate initramfs not only for the currently running kernel,

but for several recently installed kernels as well.

• Avoid find being SIGPIPE'd on early "grep -q" exit in the dracut script.
• Update stale posttrans dependency, add triggers for proper handling

of the debug kernel flavour along with kernel-rt.

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64

Fixes

• BZ - 1788786 - CVE-2020-0548 hw: Vector Register Data Sampling
• BZ - 1788788 - CVE-2020-0549 hw: L1D Cache Eviction Sampling
• BZ - 1827165 - CVE-2020-0543 hw: Special Register Buffer Data Sampling (SRBDS)

CVEs

• CVE-2020-0543
• CVE-2020-0548
• CVE-2020-0549

References