RHSA-2022:8978 - Security Advisory

Topic

An update for grub2 is now available for Red Hat Enterprise Linux 9.0 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

The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.

Security Fix(es):

• grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass (CVE-2022-2601)
• grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775)

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):

• Kernel Panic on Milan when enable SEV/SEV-ES with CPU: 1 PID: 1 Comm: swapper/0 Not tainted (BZ#2130104)
• [RHEL9.0][SecureBoot][Denali/P10] boot process stops at grub prompt after copying the signed grub to prep partition (BZ#2134358)
• RHEL9.0 [MAXconfig]: Denali LPAR crashs while booting MAX config 240c / 64TB - 192 decimal is the biggest partition min value Linux can handle? (BZ#2134434)
• ISST-LTE:[P10]:RPT:After FW update,while activating the lpar dexlp87 went to ERROR state with LED B2008105 - 7E sub return code (BZ#2135288)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

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

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.0 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.0 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 aarch64

Fixes

• BZ - 2112975 - CVE-2022-2601 grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass
• BZ - 2138880 - CVE-2022-3775 grub2: Heap based out-of-bounds write when redering certain unicode sequences

CVEs

• CVE-2022-2601
• CVE-2022-3775

References

• https://access.redhat.com/security/updates/classification/#moderate