CVE-2024-45780

Secure Boot bypass via tar size overflow

Published Mar 3, 2025 · Updated Jun 29, 2026

Out-of-bounds write in GNU GRUB 2.12 and earlier allows local users to bypass Secure Boot via a crafted tar archive. In grub-core/fs/tar.c, grub_cpio_find_file adds one to 12-digit octal tar header name and link sizes without checking whether grub_size_t wraps before allocating and writing the buffers. High local privileges and control of a tar archive read by GRUB are required; successful exploitation can undermine the boot trust boundary.

CVSS severity6.7
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in GNU GRUB 2.12 and earlier allows local users to bypass Secure Boot via a crafted tar archive. In grub-core/fs/tar.c, grub_cpio_find_file adds one to 12-digit octal tar header name and link sizes without checking whether grub_size_t wraps before allocating and writing the buffers. High local privileges and control of a tar archive read by GRUB are required; successful exploitation can undermine the boot trust boundary.

The record

CVE
CVE-2024-45780
Published
Mar 3, 2025
Updated
Jun 29, 2026
Vendor
The GnuPG Project
Product
GNU GRUB
Classifications
CWE-787, T1542.003
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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=0 <=2.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The GnuPG Project · GNU GRUBversion=0 <=2.12

Published CVSS scores

6.7Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
T1542.003Bootkit

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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