CVE-2025-61661
Grub2: grub2: out-of-bounds write via malicious usb device
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.
Fixes and workarounds
Workaround
As a mitigation Red Hat doesn't recommend to connect untrusted or unknown USB devices to the machine.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| grub2 GNU grub2
https://git.savannah.gnu.org/git/grub.git |
≥ 0; ≤ 2.14 (affected, semver)
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat grub2
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat grub2
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat grub2
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat grub2
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift/ose-rhel-coreos-9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 4.8 medium |
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H | CNA: redhat |
| 3.1 / 4.8 medium |
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/security/cve/CVE-2025-61661CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2413827CNA: redhat · issue-tracking, x_refsource_REDHAT
- http://www.openwall.com/lists/oss-security/2025/11/18/8ADP: CVE
- https://access.redhat.com/security/cve/CVE-2025-61661[email protected]
- https://bugzilla.redhat.com/show_bug.cgi?id=2413827[email protected]
- http://www.openwall.com/lists/oss-security/2025/11/18/8af854a3a-2127-422b-91ae-364da2661108
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