CVE-2024-26843

Incorrect EFI region sizing via integer truncation

Published Apr 17, 2024 · Updated May 11, 2026

Integer overflow in Linux kernel 5.5 through 6.8-rc3 allows attackers to truncate an EFI soft-reserved region's recorded size. In arm_enable_runtime_services() and riscv_enable_runtime_services(), md_size was an int, so converting the 64-bit page count to bytes narrowed the value before res->end was calculated. The condition requires ARM64 or RISC-V EFI startup with soft reservation enabled and a descriptor containing at least 4GB worth of pages; public sources identify no practical attacker-controlled input path.

CVSS severity6.0
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux kernel 5.5 through 6.8-rc3 allows attackers to truncate an EFI soft-reserved region's recorded size. In arm_enable_runtime_services() and riscv_enable_runtime_services(), md_size was an int, so converting the 64-bit page count to bytes narrowed the value before res->end was calculated. The condition requires ARM64 or RISC-V EFI startup with soft reservation enabled and a descriptor containing at least 4GB worth of pages; public sources identify no practical attacker-controlled input path.

The record

CVE
CVE-2024-26843
Published
Apr 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <156cb12ffdcf33883304f0db645e1eadae712fe0
  2. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <4aa36b62c3eaa869860bf78b1146e9f2b5f782a9
  3. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <4fff3d735baea104017f2e3c245e27cdc79f2426
  4. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <700c3f642c32721f246e09d3a9511acf40ae42be
  5. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <cf3d6813601fe496de7f023435e31bfffa74ae70
  6. Affected versionversion=16993c0f0a43213e23666ea40e9163887f593ac7 <de1034b38a346ef6be25fe8792f5d1e0684d5ff4
  7. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=16993c0f0a43213e23666ea40e9163887f593ac7 <156cb12ffdcf33883304f0db645e1eadae712fe0; version=16993c0f0a43213e23666ea40e9163887f593ac7 <4aa36b62c3eaa869860bf78b1146e9f2b5f782a9; version=16993c0f0a43213e23666ea40e9163887f593ac7 <4fff3d735baea104017f2e3c245e27cdc79f2426; version=16993c0f0a43213e23666ea40e9163887f593ac7 <700c3f642c32721f246e09d3a9511acf40ae42be; version=16993c0f0a43213e23666ea40e9163887f593ac7 <cf3d6813601fe496de7f023435e31bfffa74ae70; version=16993c0f0a43213e23666ea40e9163887f593ac7 <de1034b38a346ef6be25fe8792f5d1e0684d5ff4; version=5.5

Published CVSS scores

6.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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