Description
An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.
Affected products
gnu: grub2; redhat: enterprise linux
References10
- dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-… ExploitThird Party Advisory
- dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-… ExploitThird Party Advisory
- access.redhat.com/errata/RHSA-2024:2456
- access.redhat.com/errata/RHSA-2024:3184
- access.redhat.com/security/cve/CVE-2023-4692 Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2236613 Issue TrackingThird Party Advisory
- lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html Mailing List
- seclists.org/oss-sec/2023/q4/37 Mailing ListThird Party Advisory
- access.redhat.com/errata/RHSA-2024:2456
- access.redhat.com/errata/RHSA-2024:3184
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 46 · as of 5 November 2026
- CWE
- CWE-122CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.