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CVE-2026-46013

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mm/memfd_luo: fix physical address conversion in put_folios cleanup In memfd_luo_retrieve_folios()'s put_folios cleanup path: 1.

Published May 27, 2026EPSS 0.14%

Overview

CVE-2026-46013 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

mm/memfd_luo: fix physical address conversion in put_folios cleanup

In memfd_luo_retrieve_folios()'s put_folios cleanup path:

1. kho_restore_folio() expects a phys_addr_t (physical address) but

receives a raw PFN (pfolio->pfn). This causes kho_restore_page() to

check the wrong physical address (pfn << PAGE_SHIFT instead of the

actual physical address).

2. This loop lacks the !pfolio->pfn check that exists in the main

retrieval loop and memfd_luo_discard_folios(), which could

incorrectly process sparse file holes where pfn=0.

Fix by converting PFN to physical address with PFN_PHYS() and adding

the !pfolio->pfn check, matching the pattern used elsewhere in this file.

This issue was identified by the AI review.

https://sashiko.dev/#/patchset/[email protected]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3538f90ab89aaf302782b4b073a0aae66904cd67Refgit.kernel.org/stable/c/bd0d6bde286a2b8e3ae7975b0dcc2d43875d5fc9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46013?

CVE-2026-46013 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-46013?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-46013?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-46013?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46013 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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