CVE-2026-46013

Local denial of service via raw PFN cleanup

Published May 27, 2026 · Updated May 27, 2026

Improper physical-address handling in Linux Kernel 6.19 allows local users to disrupt kernel availability through memfd_luo cleanup. The memfd_luo_retrieve_folios() put_folios path passes a raw PFN to kho_restore_folio(), which expects a physical address, and also processes sparse holes with PFN 0. A low-privileged local account must reach this cleanup path; public sources do not specify whether the resulting disruption is a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper physical-address handling in Linux Kernel 6.19 allows local users to disrupt kernel availability through memfd_luo cleanup. The memfd_luo_retrieve_folios() put_folios path passes a raw PFN to kho_restore_folio(), which expects a physical address, and also processes sparse holes with PFN 0. A low-privileged local account must reach this cleanup path; public sources do not specify whether the resulting disruption is a hang, crash, or reboot.

The record

CVE
CVE-2026-46013
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.19
  2. Affected versionversion=b3749f174d686627f702234e64bad976dc432dbc <3538f90ab89aaf302782b4b073a0aae66904cd67
  3. Affected versionversion=b3749f174d686627f702234e64bad976dc432dbc <bd0d6bde286a2b8e3ae7975b0dcc2d43875d5fc9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=b3749f174d686627f702234e64bad976dc432dbc <3538f90ab89aaf302782b4b073a0aae66904cd67; version=b3749f174d686627f702234e64bad976dc432dbc <bd0d6bde286a2b8e3ae7975b0dcc2d43875d5fc9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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