RHSA-2020:2707 - Security Advisory

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-20200609 release:
• 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.
• Do not update 06-4e-03 (SKL-U/Y) and 06-5e-03 (SKL-H/S/Xeon E3 v5) to revision

0xdc, use 0xd6 by default.

• Enable 06-2d-07 (SNB-E/EN/EP) caveat by default.
• Enable 06-55-04 (SKL-SP/X/W) caveat by default.
• Avoid find being SIGPIPE'd on early "grep -q" exit in the dracut script.
• Re-generate initramfs not only for the currently running kernel,

but for several recently installed kernels as well.

• 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.

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 - AUS 6.5 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)
• BZ - 1840536 - [rhel-6.5.z] Package microcode-20200520 release
• BZ - 1848989 - [rhel-6.5.z] skylake (06-4e-03) microcode update hangs
• BZ - 1848998 - [rhel-6.5.z] Enable SNB-EP caveat by default

CVEs

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

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/solutions/5142691
• https://access.redhat.com/solutions/l1d-cache-eviction-and-vector-register-sampling