DEBIAN-CVE-2026-97876
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.
DEBIAN-CVE-2026-97876
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-97876
grub2
Source reference: /affected/0/package/name
- Affected versions
- 2.12-9
Source reference:
/affected/0/versions2.12-9+deb13u1Source reference:
/affected/0/versions2.12-9+deb13u2Source reference:
/affected/0/versions2.12-9+hurd.1Source reference:
/affected/0/versions2.14-1Source reference:
/affected/0/versions2.14-2Source reference:
/affected/0/versions2.14-3Source reference:
/affected/0/versions2.14-4Source reference:
/affected/0/versions2.14~git20250718.0e36779-1Source reference:
/affected/0/versions2.14~git20250718.0e36779-2Source reference:
/affected/0/versions2.16-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
grub2
Source reference: /affected/1/package/name
- Affected versions
- 2.12-9
Source reference:
/affected/1/versions2.12-9+hurd.1Source reference:
/affected/1/versions2.14-1Source reference:
/affected/1/versions2.14-2Source reference:
/affected/1/versions2.14-3Source reference:
/affected/1/versions2.14~git20250718.0e36779-1Source reference:
/affected/1/versions2.14~git20250718.0e36779-2Source reference:
/affected/1/versions - Fixed versions
- 2.14-4
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "grub2",
"purl": "pkg:deb/debian/grub2?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.12-9",
"2.12-9+deb13u1",
"2.12-9+deb13u2",
"2.12-9+hurd.1",
"2.14-1",
"2.14-2",
"2.14-3",
"2.14-4",
"2.14~git20250718.0e36779-1",
"2.14~git20250718.0e36779-2",
"2.16-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-97876.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.14-4"
}
]
}
],
"package": {
"name": "grub2",
"purl": "pkg:deb/debian/grub2?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.12-9",
"2.12-9+hurd.1",
"2.14-1",
"2.14-2",
"2.14-3",
"2.14~git20250718.0e36779-1",
"2.14~git20250718.0e36779-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-97876.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]- Related CVEs
- CVE-2026-97876
Source reference:
/upstream
Publisher severity
medium
Source reference: /severity/0/score
- Event
- #85900 · Revision 1
- Added to Heist Feed
- Publisher date