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Linux Kernel CVE-2026-80685

| EUVDEUVD-2026-67561 HIGH
2026-08-28 Linux GHSA-ccm4-344c-hjv9
Information Disclosure Linux Red Hat Suse
High
Disputed · 7.1 Vendor: Linux
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Severity by source

Sources disagree (Low–High)
Vendor (Linux) PRIMARY
7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
vuln.today AI
5.7 MEDIUM

DLPAR memory remove requires admin privileges (PR:H) and a specific ppc64le vmemmap boundary topology (AC:H); no integrity impact applies.

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

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 08:01 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.1 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:52 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:52 cve.org
HIGH 7.1

DescriptionCVE.org

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

mm/util: don't read __page_2 for order-1 folios in snapshot_page()

snapshot_page() currently reads __page_2 after checking nr_pages > 1, but it should only do so when nr_pages > 2.

If an order-1 folio is allocated at the end of a vmemmap section, __page_2 will not exist and reading it will cause a fault.

During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed on the page isolation path while reading an order-1 folio's __page_2 from an adjacent absent section (unmapped vmemmap).

Fix this to avoid reading memmap that doesn't exist (e.g., a vmemmap hole).

AnalysisAI

Out-of-bounds vmemmap read in the Linux kernel's mm/util snapshot_page() crashes or leaks kernel memory during page isolation on memory-remove paths. The function incorrectly reads __page_2 when nr_pages > 1 rather than the correct threshold of nr_pages > 2, causing an illegal access into an adjacent, unmapped vmemmap section when an order-1 folio sits at a vmemmap section boundary. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Requires: (1) local access with privileges sufficient to trigger kernel-level memory hotplug removal - in practice, root or an equivalent capability on ppc64le IBM Power hardware running Linux; (2) a DLPAR memory remove operation (IBM-specific dynamic logical partitioning hardware feature); (3) the specific memory topology condition where an order-1 folio is allocated at the final page frame of a populated vmemmap section, with the immediately adjacent section absent/unmapped. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD-supplied CVSS 3.1 base score of 7.1 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H) appears to overstate accessibility. … 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 Upgrade to a patched kernel release: Linux 6.18.44, Linux 7.1.8, or Linux 7.2 or later. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify systems running affected Linux kernel versions and determine which utilize memory hotplug or DLPAR functionality. …

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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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CVE-2026-80685 vulnerability details – vuln.today
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