CVE-2026-97876

mediumpriority · track · 0EPSS 0.001 · 2 %ileDE
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.11% (2nd) EPSS
CVSS 6.4 · medium
Is it mine?
2 products
Check your exposure
Who says so?
1 sources
cert_bund

EPSS · scored 2026-10-27

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

6.4
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.4mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · security@ubuntu.comexploitability 0.5 · impact 5.9
v3.15.9mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-822US
04

affected products (2)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-3733Grub: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und die Ausführung von CodeDeutsch2026-10-04csaf · cert_bundDE

    Ein lokaler Angreifer kann eine Schwachstelle in Grub ausnutzen, um Sicherheitsvorkehrungen zu umgehen und so beliebigen Code auszuführen.

06

sources

Which sources assert this record, and when.

cert_bundNVDCVE.orgMITRE
published 2026-10-02modified 2026-10-02
07

references (2) nvd

External citations — patches, advisories, analysis.

scry

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