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CVE-2022-2601· NVD / CVE Program· CNA redhat

A buffer overflow was found in grub_font_construct_glyph().

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.51% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: grub2-common (AlmaLinux:8) 1:2.02-142.el8_7.1.alma; grub2-efi-aa64 (AlmaLinux:8) 1:2.02-142.el8_7.1.alma; grub2-efi-aa64-cdboot (AlmaLinux:8) 1:2.02-142.el8_7.1.alma.

Low priority for now. Upgrade to grub2-common (AlmaLinux:8) 1:2.02-142.el8_7.1.alma; grub2-efi-aa64 (AlmaLinux:8) 1:2.02-142.el8_7.1.alma; grub2-efi-aa64-cdboot (AlmaLinux:8) 1:2.02-142.el8_7.1.alma or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.6 · v3.1—No exploit Fix available
Published
Dec 14, 2022
Updated
Jun 17, 2026
EPSS
0.5% · 42th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gnugrub2
fedoraprojectfedora
redhatenterprise linux eus
redhatenterprise linux for power little endian eus
redhatenterprise linux server aus
redhatenterprise linux server for power little endian update services for sap solutions
redhatenterprise linux server tus
redhatenterprise linux server update services for sap solutions

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora37
  • gnu grub2up to 2.06 inclusive
  • redhat enterprise linux eus9.0
  • redhat enterprise linux for power little endian eus9.0
  • redhat enterprise linux server aus8.2
  • redhat enterprise linux server for power little endian update services for sap solutions8.1
  • redhat enterprise linux server for power little endian update services for sap solutions8.2
  • redhat enterprise linux server for power little endian update services for sap solutions9.0
  • redhat enterprise linux server tus8.2
  • redhat enterprise linux server update services for sap solutions8.1
  • redhat enterprise linux server update services for sap solutions8.2
  • redhat enterprise linux server update services for sap solutions9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a grub2

    • grub2 2.06 and loweraffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8grub2-commonbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-aa64before 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-aa64-cdbootbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-aa64-modulesbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-ia32before 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-ia32-cdbootbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-ia32-modulesbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-x64before 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-x64-cdbootbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-efi-x64-modulesbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-pcbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-pc-modulesbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-ppc64lebefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-ppc64le-modulesbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-toolsbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-tools-efibefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-tools-extrabefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:8grub2-tools-minimalbefore 1:2.02-142.el8_7.1.alma1:2.02-142.el8_7.1.alma
AlmaLinux:9grub2-commonbefore 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma
AlmaLinux:9grub2-efi-aa64before 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma
AlmaLinux:9grub2-efi-aa64-cdbootbefore 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma
AlmaLinux:9grub2-efi-aa64-modulesbefore 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma
AlmaLinux:9grub2-efi-x64before 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma
AlmaLinux:9grub2-efi-x64-cdbootbefore 1:2.06-46.el9_1.3.alma1:2.06-46.el9_1.3.alma

+96

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-56737GNU GRUB (aka GRUB2) through 2.12 has a heap-based buffer overflow in fs/hfs.c via crafted sblock data in an HFS filesystem.
    35Monitor
  • CVE-2020-10713A flaw was found in grub2, prior to version 2.06.
    33Monitor
  • CVE-2022-28733Integer underflow in grub_net_recv_ip4_packets
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-3696Jul 6, 2022 · A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader.
    18Monitor
  • ← EarlierCVE-2021-3697Jul 6, 2022 · A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap.
    28Monitor
  • Later →CVE-2022-3775Dec 19, 2022 · When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:grub2-common1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-aa641:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-aa64-cdboot1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-aa64-modules1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-ia321:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-ia32-cdboot1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-ia32-modules1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-x641:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-x64-cdboot1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-efi-x64-modules1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-pc1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
almalinux:grub2-pc-modules1:2.02-142.el8_7.1.alma · AlmaLinux:8Package registry (OSV)
debian:grub22.06-5 · Debian:12Package registry (OSV)
opensuse:grub22.06-150400.11.17.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
red hat:grub21:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-common1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-debuginfo1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-debugsource1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-aa64-modules1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-ia321:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-ia32-cdboot1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-ia32-modules1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-x641:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-x64-cdboot1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-efi-x64-modules1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
red hat:grub2-pc1:2.02-87.el8_1.11 · Red Hat:rhel_e4s:8.1::baseosPackage registry (OSV)
rocky linux:grub21:2.02-142.el8_7.1.rocky.0.2 · Rocky Linux:8Package registry (OSV)
suse:grub22.02-150000.122.17.1 · SUSE:Linux Enterprise High Performance Computing 15-ESPOSPackage registry (OSV)
suse:grub22.06-150400.11.17.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records