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TI-2022-11367 Aliases CVE-2022-28733GHSA-2rxj-vwp2-v63v

Integer underflow in GNU GRUB

Priority MEDIUM 40CWE-191Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-191 and the CVSS impact.

Summary

Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01273 70th percentileScored 2026-11-07
Fix Fixed GNU GRUB (GNU Project): 2.06-3Red Hat: 7 advisories

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
GNUGNU GRUBbefore 2.06-32.06-3Patch availableCNA
  • GNU GRUB VendorGNU Affected before 2.06-3 Fixed in 2.06-3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*2.00 to before 2.06-3VulnerableGNU
  • cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* Versions 2.00 to before 2.06-3 Vulnerable ·GNU

Remediation

  • Fix · CNA GNU GRUB (GNU Project) Fixed in 2.06-3

Red Hat 7 advisories

  • RHSA-2022:8900 Released 2022-12-08 · Red Hat rating Important
    grub2 security update
    • Red Hat Enterprise Linux Client (v. 7) grub2-1:2.02-0.87.el7_9.11, grub2-common-1:2.02-0.87.el7_9.11, grub2-efi-ia32-1:2.02-0.87.el7_9.11 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) grub2-efi-aa64-modules-1:2.02-0.87.el7_9.11, grub2-efi-ia32-cdboot-1:2.02-0.87.el7_9.11, grub2-efi-x64-cdboot-1:2.02-0.87.el7_9.11 +3
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) grub2-efi-aa64-modules-1:2.02-0.87.el7_9.11, grub2-efi-ia32-cdboot-1:2.02-0.87.el7_9.11, grub2-efi-x64-cdboot-1:2.02-0.87.el7_9.11 +3
    • Red Hat Enterprise Linux Server (v. 7) grub2-1:2.02-0.87.el7_9.11, grub2-common-1:2.02-0.87.el7_9.11, grub2-efi-ia32-1:2.02-0.87.el7_9.11 +12
    • Red Hat Enterprise Linux Server Optional (v. 7) grub2-efi-aa64-modules-1:2.02-0.87.el7_9.11, grub2-efi-ia32-cdboot-1:2.02-0.87.el7_9.11, grub2-efi-ia32-modules-1:2.02-0.87.el7_9.11 +6
    • Red Hat Enterprise Linux Workstation (v. 7) grub2-1:2.02-0.87.el7_9.11, grub2-common-1:2.02-0.87.el7_9.11, grub2-efi-ia32-1:2.02-0.87.el7_9.11 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) grub2-efi-aa64-modules-1:2.02-0.87.el7_9.11, grub2-efi-ia32-cdboot-1:2.02-0.87.el7_9.11, grub2-efi-x64-cdboot-1:2.02-0.87.el7_9.11 +3
  • RHSA-2022:5678 Released 2022-07-21 · Red Hat rating Important
    Red Hat Virtualization security, bug fix, and enhancement update [ovirt-4.5.1]
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.5.1-202207170705_8.6, redhat-virtualization-host-image-update-4.5.1-202207170705_8.6
  • 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
Show 4 more Red Hat advisories
  • 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
  • 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

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    GNU GRUB 2.06-3

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2022-11368 Out-of-bounds write in GNU GRUBPriority LOW 37
    • TI-2022-11370 Use after free in GNU GRUBPriority LOW 36
    • TI-2022-11369 The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered…Priority LOW 36
    Show all 4 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
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 Client (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:8900
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:8900
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2022:5678
Not affected: 10 products
  • RHEL 8-based RHEV-H for RHEV 4 (build requirements)
  • Red Hat CodeReady Linux Builder (v. 9)
  • Red Hat CodeReady Linux Builder EUS (v. 8.2)
  • 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)
  • Red Hat Enterprise Linux CRB (v. 8)
  • Red Hat Enterprise Linux CRB EUS (v.8.4)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-28733
  2. 2026-10-03 Alias added: GHSA-2rxj-vwp2-v63v

References

Advisory 2

Other 1

  • TI-2023-04324 Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution CVSS 3.1HIGH 7.8
  • TI-2015-06891 Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate… CVSS 3.1HIGH 7.4
  • TI-2024-37620 Heap-based buffer overflow in GNU GRUB2 CVSS 3.1HIGH 8.8
  • TI-2022-02403 Heap-based buffer overflow in grub2 CVSS 3.1HIGH 8.6
  • TI-2020-08612 Buffer overflow in Grub CVSS 3.1HIGH 8.2
  • TI-2020-15650 Use after free in grub2 CVSS 3.1HIGH 8.2
See all 47 →

Sources

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