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CVE-2025-61661— Grub2: grub2: out-of-bounds write via malicious usb device

Quick assessment

Affected
GNU grub2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU GRUB是GNU社区的一款Linux系统引导程序。 GNU GRUB存在安全漏洞，该漏洞源于USB设备字符串转换处理不当，可能导致拒绝服务或数据损坏。

CVSS 4.8 · Medium EPSS 0.19% · P8

Affected Version Matrix 7

VendorProduct Version RangeStatus
GNU grub2 ≤ 2.14 affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2025-61661

Vulnerability Information
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Vulnerability Title
Grub2: grub2: out-of-bounds write via malicious usb device
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
GNU GRUB 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU GRUB是GNU社区的一款Linux系统引导程序。 GNU GRUB存在安全漏洞，该漏洞源于USB设备字符串转换处理不当，可能导致拒绝服务或数据损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU grub2 0 ~ 2.14 -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2025-61661

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III. Intelligence Information for CVE-2025-61661

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Vendor Advisories for CVE-2025-61661 (1)

Same Patch Batch · GNU · 2025-11-18 · 6 CVEs total

CVE-2025-61662 7.8 HIGH Grub2: missing unregister call for gettext command may lead to use-after-free
CVE-2025-61663 4.9 MEDIUM Grub2: missing unregister call for normal commands may lead to use-after-free
CVE-2025-61664 4.9 MEDIUM Grub2: missing unregister call for normal_exit command may lead to use-after-free
CVE-2025-54770 4.9 MEDIUM Grub2: use-after-free in net_set_vlan
CVE-2025-54771 4.9 MEDIUM Grub2: use-after-free in grub_file_close()

IV. Related Vulnerabilities

Same product: grub2
Same vendor: GNU
Same weakness: CWE-131

V. Comments for CVE-2025-61661

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