CVE-2025-0690: Grub2: read: integer overflow may lead to out-of-bounds write
Description
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.
Classification
CVE ID: CVE-2025-0690
Problem Types
Out-of-bounds WriteAffected Products
Vendor: Red Hat, Red Hat, Red Hat, Red Hat
Product: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.07% (probability of being exploited)
EPSS Percentile: 17.32% (scored less or equal to compared to others)
EPSS Date: 2025-03-25 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-0690https://access.redhat.com/security/cve/CVE-2025-0690
https://bugzilla.redhat.com/show_bug.cgi?id=2346123