RHSA-2022:5096: Important: grub2, mokutil, shim, and shim-unsigned-x64 security update

Published Jun 16, 2022
·
Updated

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.The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.Security Fix(es): grub2: Integer underflow in grubnetrecvip4packets (CVE-2022-28733) grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695) grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696) grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697) grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734) grub2: shimlock verifier allows non-kernel files to be loaded (CVE-2022-28735) grub2: use-after-free in grubcmdchainloader() (CVE-2022-28736) shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737) 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.

Affected Software

54 affected componentsFixes available
redhat/grub2<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/mokutil<0.3.0-11.el8_4.1
0.3.0-11.el8_4.1
redhat/shim<15.6-1.el8
15.6-1.el8
redhat/grub2-common<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-debugsource<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-aa64-modules<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-ia32<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-ia32-cdboot<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-ia32-modules<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-x64<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-x64-cdboot<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-efi-x64-modules<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-pc<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-pc-modules<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-ppc64le-modules<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-efi<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-efi-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-extra<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-extra-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-minimal<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-minimal-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/mokutil<0.3.0-11.el8_4.1
0.3.0-11.el8_4.1
redhat/mokutil-debuginfo<0.3.0-11.el8_4.1
0.3.0-11.el8_4.1
redhat/mokutil-debugsource<0.3.0-11.el8_4.1
0.3.0-11.el8_4.1
redhat/shim-ia32<15.6-1.el8
15.6-1.el8
redhat/shim-x64<15.6-1.el8
15.6-1.el8
redhat/grub2-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-debugsource<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-ppc64le<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-extra<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-extra-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-minimal<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-tools-minimal-debuginfo<2.02-99.el8_4.9
2.02-99.el8_4.9
redhat/grub2-debuginfo<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-debugsource<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-efi-aa64<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-efi-aa64-cdboot<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools-debuginfo<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools-extra<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools-extra-debuginfo<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools-minimal<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/grub2-tools-minimal-debuginfo<2.02-99.el8_4.9.aa
2.02-99.el8_4.9.aa
redhat/mokutil<0.3.0-11.el8_4.1.aa
0.3.0-11.el8_4.1.aa
redhat/mokutil-debuginfo<0.3.0-11.el8_4.1.aa
0.3.0-11.el8_4.1.aa
redhat/mokutil-debugsource<0.3.0-11.el8_4.1.aa
0.3.0-11.el8_4.1.aa
redhat/shim-aa64<15.6-1.el8.aa
15.6-1.el8.aa
redhat/shim-unsigned-x64<15.6-1.el8
15.6-1.el8
redhat/shim-unsigned-x64<15.6-1.el8
15.6-1.el8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/grub2 to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  2. Upgrade

    Upgrade redhat/mokutil to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1
  3. Upgrade

    Upgrade redhat/shim to a version that resolves this vulnerability.

    Fixed in 15.6-1.el8
  4. Upgrade

    Upgrade redhat/grub2-common to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  5. Upgrade

    Upgrade redhat/grub2-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  6. Upgrade

    Upgrade redhat/grub2-debugsource to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  7. Upgrade

    Upgrade redhat/grub2-efi-aa64-modules to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  8. Upgrade

    Upgrade redhat/grub2-efi-ia32 to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  9. Upgrade

    Upgrade redhat/grub2-efi-ia32-cdboot to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  10. Upgrade

    Upgrade redhat/grub2-efi-ia32-modules to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  11. Upgrade

    Upgrade redhat/grub2-efi-x64 to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  12. Upgrade

    Upgrade redhat/grub2-efi-x64-cdboot to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  13. Upgrade

    Upgrade redhat/grub2-efi-x64-modules to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  14. Upgrade

    Upgrade redhat/grub2-pc to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  15. Upgrade

    Upgrade redhat/grub2-pc-modules to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  16. Upgrade

    Upgrade redhat/grub2-ppc64le-modules to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  17. Upgrade

    Upgrade redhat/grub2-tools to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  18. Upgrade

    Upgrade redhat/grub2-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  19. Upgrade

    Upgrade redhat/grub2-tools-efi to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  20. Upgrade

    Upgrade redhat/grub2-tools-efi-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  21. Upgrade

    Upgrade redhat/grub2-tools-extra to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  22. Upgrade

    Upgrade redhat/grub2-tools-extra-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  23. Upgrade

    Upgrade redhat/grub2-tools-minimal to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  24. Upgrade

    Upgrade redhat/grub2-tools-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  25. Upgrade

    Upgrade redhat/mokutil-debuginfo to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1
  26. Upgrade

    Upgrade redhat/mokutil-debugsource to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1
  27. Upgrade

    Upgrade redhat/shim-ia32 to a version that resolves this vulnerability.

    Fixed in 15.6-1.el8
  28. Upgrade

    Upgrade redhat/shim-x64 to a version that resolves this vulnerability.

    Fixed in 15.6-1.el8
  29. Upgrade

    Upgrade redhat/grub2-ppc64le to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9
  30. Upgrade

    Upgrade redhat/grub2-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  31. Upgrade

    Upgrade redhat/grub2-debugsource to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  32. Upgrade

    Upgrade redhat/grub2-efi-aa64 to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  33. Upgrade

    Upgrade redhat/grub2-efi-aa64-cdboot to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  34. Upgrade

    Upgrade redhat/grub2-tools to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  35. Upgrade

    Upgrade redhat/grub2-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  36. Upgrade

    Upgrade redhat/grub2-tools-extra to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  37. Upgrade

    Upgrade redhat/grub2-tools-extra-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  38. Upgrade

    Upgrade redhat/grub2-tools-minimal to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  39. Upgrade

    Upgrade redhat/grub2-tools-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 2.02-99.el8_4.9.aa
  40. Upgrade

    Upgrade redhat/mokutil to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1.aa
  41. Upgrade

    Upgrade redhat/mokutil-debuginfo to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1.aa
  42. Upgrade

    Upgrade redhat/mokutil-debugsource to a version that resolves this vulnerability.

    Fixed in 0.3.0-11.el8_4.1.aa
  43. Upgrade

    Upgrade redhat/shim-aa64 to a version that resolves this vulnerability.

    Fixed in 15.6-1.el8.aa
  44. Upgrade

    Upgrade redhat/shim-unsigned-x64 to a version that resolves this vulnerability.

    Fixed in 15.6-1.el8

Event History

Jun 1, 2026
Advisory Published
via Red Hat·10:50 AM
Data Sourced
via Red Hat·10:50 AM
RemedyDescriptionAffected Software

Frequently Asked Questions

1

What is the severity of RHSA-2022:5096?

The severity of RHSA-2022:5096 is categorized as important.

2

How do I fix RHSA-2022:5096?

To fix RHSA-2022:5096, update the affected grub2, shim, and mokutil packages to the specified versions in the advisory.

3

What systems are affected by RHSA-2022:5096?

RHSA-2022:5096 affects systems running specific versions of the grub2, shim, and mokutil packages on Red Hat Enterprise Linux 8.

4

When was RHSA-2022:5096 announced?

RHSA-2022:5096 was announced on December 13, 2022.

5

What are the implications of not addressing RHSA-2022:5096?

Not addressing RHSA-2022:5096 may leave systems vulnerable to security risks exploitable through the affected packages.

Company

Resources

Contact

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