6.4

CVE-2026-97876: gnu grub2 Untrusted Pointer Dereference

CVSS: 6.4v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-97876DEBIAN-CVE-2026-97876
Published 02-10-2026Last modified 02-10-2026
Open JSON

Vulnerability summary

CVE-2026-97876 is a medium (CVSS 6.4) Untrusted Pointer Dereference vulnerability in gnu grub2. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.4% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.11%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-10-2026
    PublishedVulnerability first disclosed.
  2. 02-10-2026
    Last modifiedVulnerability information updated.

Description

A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled. The vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial command. GRUB does not validate that the base address corresponds to a UART device, rather than being an arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an attacker-controlled address, including resetting the grub_file_verifiers list in a way that disables the subsequent verification of loaded modules.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

03-10-202620-10-2026
EPSS score
0.11%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu3 products
  • grub2All versions (No fix recorded)
  • grub2-signedAll versions (No fix recorded)
  • grub2-unsignedAll versions (No fix recorded)
Debian1 product
  • grub2All versions (No fix recorded) | < 2.14-4
Gnu1 product

3 vendors · 5 products

References

5 links