Buffer overflow in GNU Grub2
CVE-2022-2601
A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- GNU Grub2
- Fedoraproject Fedora — versions 37
- Red Hat Enterprise Linux Eus — versions 9.0
- Red Hat Enterprise Linux For Power Little Endian Eus — versions 9.0
- Red Hat Enterprise Linux Server Aus — versions 8.2
- Red Hat Enterprise Linux Server For Power Little Endian Update Services SAP Solutions — versions 8.1, 8.2, 9.0
- Red Hat Enterprise Linux Server Tus — versions 8.2
- Red Hat Enterprise Linux Server Update Services For SAP Solutions — versions 8.1, 8.2, 9.0
- Grub2 — versions grub2 2.06 and lower
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- security.netapp.com/advisory/ntap-20230203-0004/
- security.gentoo.org/glsa/202311-14 (vendor-advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2022-2601?
- CVE-2022-2601 is a high-severity vulnerability in GNU Grub2, classified under Heap-based Buffer Overflow. CVSS score: 8.6/10. Published 2022-12-14.
- How severe is CVE-2022-2601?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2022-2601 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.