CVE-2023-4693

Grub2: out-of-bounds read at fs/ntfs.c

MEDIUM
4.6
CVSS Score
Published: October 25, 2023 at 10:27 AM UTC
Updated: July 21, 2026 at 06:29 AM UTC
2 products affected across 2 vendorsEnterprise LinuxGRUB2

Using Red Hat Enterprise Linux 8 by Red Hat?

Get instant alerts when new vulnerabilities affect Red Hat Enterprise Linux 8 - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM4.6
Exploit prediction
EPSS 0.5%

Description

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.12
Affected range stops below 2.12, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 1:2.02-156.el8 (unaffected)
Vendor states this is fixed in 1:2.06-77.el9 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card