CVE-2025-6990: 
WordPress vulnerability analysis and mitigation

CVE-2025-6990 is a security advisory released on May 13, 2025, affecting the grub2 packages in Red Hat Enterprise Linux 9. The advisory includes multiple vulnerabilities in GRUB2 (Grand Unified Boot Loader), a highly configurable boot loader with modular architecture. Red Hat Product Security has rated this update as having a security impact of Moderate (Red Hat Advisory).

The vulnerability encompasses multiple issues in grub2, including integer overflows leading to heap-based out-of-bounds writes and reads, use-after-free vulnerabilities, and missing allocation checks. Two notable components affected are the read command, which can experience an integer overflow leading to out-of-bounds write (CVE-2025-0690), and the UFS module's symlink handling, which can result in heap corruption due to buffer overflow (CVE-2025-0677). The CVSS base scores range from 6.1 to 6.4, indicating moderate severity (NVD CVE-2025-0690, NVD CVE-2025-0677).

The vulnerabilities could potentially lead to heap corruption, arbitrary code execution, and possible secure boot bypass. The most severe impact comes from the UFS symlink handling flaw, which could allow an attacker to corrupt data stored in the heap and potentially execute arbitrary code to bypass secure boot mechanisms (NVD CVE-2025-0677).

Red Hat has released security updates to address these vulnerabilities. The fix is available in grub2 version 2.06-104.el9_6 for affected Red Hat Enterprise Linux 9 systems. Users are advised to apply the security update following Red Hat's detailed instructions (Red Hat Advisory).