CVE-2026-80685

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).

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/7441d6348c70738e9ed307510db171c7a9b3f4bf
https://git.kernel.org/stable/c/9668ffe0e2a5e2399dce281620198a2e415871fc
https://git.kernel.org/stable/c/c649324571206a30949765320b91ccdb4c1722dc

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-28 08:16

Updated : 2026-09-21 14:17

NVD link : CVE-2026-80685

Mitre link : CVE-2026-80685

CVE.ORG link : CVE-2026-80685

JSON object : View

Products Affected

No product.

CWE

No CWE.

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