RHSA-2020:2677 - Security Advisory

Topic

An update for microcode_ctl is now available for Red Hat enterprise Linux 8.1 Extended Update Support.

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 to point to the GitHub repository since the microcode download.

section at Intel Download Center does not exist anymore.

• Avoid temporary file creation, used for here-documents in check_caveats.

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 for x86_64 - Extended Update Support 8.1 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.1 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 - 1848439 - [rhel-8.1.0] skylake (06-4e-03) microcode update hangs
• BZ - 1848502 - [rhel-8.1.0] Package microcode-20200609 release

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