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TI-2022-11371 Aliases CVE-2022-28737GHSA-hmxr-46w2-jjwh

Out-of-bounds write in Red Hat Bootloader Team shim

Priority LOW 36CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 9 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not discarded in such scenario.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00328 26th percentileScored 2026-11-07
Fix Partial shim (Red Hat Bootloader Team): 15.6Red Hat: 5 advisoriesRed Hat: 9 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red Hat Bootloader Teamshimbefore 15.615.6Patch availableCNA
  • shim VendorRed Hat Bootloader Team Affected before 15.6 Fixed in 15.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:redhat:shim:*:*:*:*:*:*:*:*before 15.6VulnerableRed Hat
  • cpe:2.3:a:redhat:shim:*:*:*:*:*:*:*:* Versions before 15.6 Vulnerable ·Red Hat

Remediation

  • Fix · CNA shim (Red Hat Bootloader Team) Fixed in 15.6

Red Hat 5 advisories

  • RHSA-2022:5100 Released 2022-06-16 · Red Hat rating Important
    grub2, mokutil, shim, and shim-unsigned-x64 security update
    • Red Hat CodeReady Linux Builder EUS (v. 8.2) shim-unsigned-x64-15.6-1.el8
    • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) grub2-1:2.02-87.el8_2.10, grub2-common-1:2.02-87.el8_2.10, grub2-efi-aa64-1:2.02-87.el8_2.10 +20
  • RHSA-2022:5095 Released 2022-06-16 · Red Hat rating Important
    grub2, mokutil, shim, and shim-unsigned-x64 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) grub2-1:2.02-123.el8_6.8, grub2-common-1:2.02-123.el8_6.8, grub2-efi-aa64-1:2.02-123.el8_6.8 +20
    • Red Hat Enterprise Linux CRB (v. 8) shim-unsigned-x64-15.6-1.el8
  • RHSA-2022:5099 Released 2022-06-16 · Red Hat rating Important
    grub2, mokutil, shim, and shim-unsigned-x64 security update
    • Red Hat CodeReady Linux Builder (v. 9) shim-unsigned-x64-15.6-1.el9
    • Red Hat Enterprise Linux BaseOS (v. 9) grub2-1:2.06-27.el9_0.7, grub2-common-1:2.06-27.el9_0.7, grub2-efi-aa64-1:2.06-27.el9_0.7 +16
Show 2 more Red Hat advisories
  • RHSA-2022:5096 Released 2022-06-16 · Red Hat rating Important
    grub2, mokutil, shim, and shim-unsigned-x64 security update
    • Red Hat Enterprise Linux BaseOS EUS (v.8.4) grub2-1:2.02-99.el8_4.9, grub2-common-1:2.02-99.el8_4.9, grub2-efi-aa64-1:2.02-99.el8_4.9 +20
    • Red Hat Enterprise Linux CRB EUS (v.8.4) shim-unsigned-x64-15.6-1.el8
  • RHSA-2022:5098 Released 2022-06-16 · Red Hat rating Important
    grub2, mokutil, and shim security update
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) grub2-1:2.02-87.el8_1.10, grub2-common-1:2.02-87.el8_1.10, grub2-efi-aa64-modules-1:2.02-87.el8_1.10 +17

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat CodeReady Linux Builder (v. 9)Fixed RHSA-2022:5099
Red Hat CodeReady Linux Builder EUS (v. 8.2)Fixed RHSA-2022:5100
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2022:5095
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2022:5099
Red Hat Enterprise Linux BaseOS E4S (v. 8.1)Fixed RHSA-2022:5098
Red Hat Enterprise Linux BaseOS EUS (v. 8.2)Fixed RHSA-2022:5100
Red Hat Enterprise Linux BaseOS EUS (v.8.4)Fixed RHSA-2022:5096
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2022:5095
Red Hat Enterprise Linux CRB EUS (v.8.4)Fixed RHSA-2022:5096
Not affected: 5 products
  • Red Hat Enterprise Linux BaseOS (v. 8)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2)
  • Red Hat Enterprise Linux BaseOS EUS (v.8.4)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-28737
  2. 2026-10-03 Alias added: GHSA-hmxr-46w2-jjwh

References

Advisory 2

  • TI-2023-21352 Shim: rce in http boot support may lead to secure boot bypass CVSS 3.1HIGH 8.3
  • TI-2014-02993 Heap-based buffer overflow in Shim allows remote attackers to execute arbitrary code via… CVSS 2.0HIGH 7.5
  • TI-2014-02994 Unspecified vulnerability in Shim might allow attackers to execute arbitrary code via a… CVSS 2.0HIGH 7.5
  • TI-2023-21353 Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems CVSS 3.1HIGH 7.4
  • TI-2023-21354 Shim: out-of-bounds read in verify_buffer_authenticode() malformed pe file CVSS 3.1MEDIUM 6.2
  • TI-2023-21351 Shim: out-of-bounds read printing error messages CVSS 3.1MEDIUM 6.2
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences