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Linux Kernel EUVDEUVD-2026-67458

| CVE-2026-80723 HIGH
2026-08-28 Linux GHSA-m4gx-g2g6-vwmj
Information Disclosure Linux Red Hat Suse
8.4
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
8.4 HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.4 MEDIUM

Requires high-privilege firmware or bootloader write access to modify device tree; AC:H reflects boot-phase memory layout variability that complicates reliable OOB write exploitation.

3.1 AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
5.1 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 08:17 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
8.4 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:53 cve.org
HIGH 8.4

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

of: reserved_mem: prevent OOB when too many dynamic regions are defined

On boot, fdt_scan_reserved_mem() saves each dynamically-placed /reserved-memory subnode into a local array of size MAX_RESERVED_REGIONS.

If the device tree defines more than MAX_RESERVED_REGIONS dynamically-placed regions, fdt_scan_reserved_mem() writes past the end of the local array.

Add a bounds check that logs an error and skips the excess regions, restoring the original behavior.

AnalysisAI

Out-of-bounds memory write in the Linux kernel's device tree reserved memory subsystem allows an attacker with control over device tree content to corrupt kernel memory at boot time, with theoretical full kernel compromise (C:H/I:H/A:H). The fdt_scan_reserved_mem() function writes past the end of a fixed-size local array when a device tree blob defines more dynamically-placed /reserved-memory subnodes than MAX_RESERVED_REGIONS allows. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires the ability to modify the device tree blob (DTB/FDT) supplied to the Linux kernel at boot - typically stored in firmware flash, provided by a bootloader such as U-Boot, or embedded in the kernel image itself. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-provided CVSS 3.1 score of 8.4 with vector AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H materially overstates real-world exploitability: the PR:N designation is inconsistent with the actual attack prerequisites, as modifying a device tree blob in production requires privileged firmware or bootloader access - not a no-privilege operation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is to upgrade to a patched kernel release: 6.12.103 or later for the 6.12 stable branch, 6.18.44 or later for the 6.18 branch, 7.1.8 or later for the 7.1 branch, or 7.2 for mainline. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify Linux systems in your environment and verify current kernel versions against CVE-2026-80723 vendor advisories, prioritizing any systems with firmware access or direct hardware modification capabilities. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 16.0 Not-Affected

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EUVD-2026-67458 vulnerability details – vuln.today
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