Medium [CVE-2025-0690] Grub2: read: integer overflow may lead to out-of-bounds write
This medium-severity Red Hat Linux advisory covers CVE-2025-0690 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character.
During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.
Red Hat Product Security has rated this vulnerability with Moderate severity as it requires physical access and high privileges to exploit it. Weakness: CWE-787.
Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 10 as not affected.
Will not fix / out of support: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Red Hat fixing advisory: RHSA-2025:6990.
Affected products named by the advisory: Red Hat package: grub2.
Is CVE-2025-0690 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-0690 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-0690?
Upgrade to a fixed release named by Red Hat:
- grub2-1:2.06-104.el9_6
- RHSA-2025:6990
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
- grub2-1:2.06-104.el9_6
- RHSA-2025:6990
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 20 days ago·verify at source
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