CVE-2025-0690
MEDIUM 1 PoC
MEDIUM
Priority: 0.05
BB Relevance:
32/100
Published: 2025-02-24
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Physical
AC:
Low
PR:
High
UI:
Required
S:
Unchanged
C:
High
I:
High
A:
High
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.
Weakness Classification (1)
References & Advisories (4)
vendor-advisory
x_refsource_REDHAT
vdb-entry
x_refsource_REDHAT
issue-tracking
x_refsource_REDHAT