CVE-2026-64131

Spurious warning via incorrect folio anonymity test

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper validation in the Linux Kernel allows local users to trigger a spurious kernel warning during process teardown. In zap_nonpresent_ptes(), the unmap path applies vma_is_anonymous() to a private file-backed mapping even though its migrated folio can satisfy folio_test_anon(). Reachability requires device-private page migration, such as a GPU using HMM, and teardown of that mapping; the published behavior is a warning rather than a crash or data compromise.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper validation in the Linux Kernel allows local users to trigger a spurious kernel warning during process teardown. In zap_nonpresent_ptes(), the unmap path applies vma_is_anonymous() to a private file-backed mapping even though its migrated folio can satisfy folio_test_anon(). Reachability requires device-private page migration, such as a GPU using HMM, and teardown of that mapping; the published behavior is a warning rather than a crash or data compromise.

The record

CVE
CVE-2026-64131
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5.19
  2. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <2fff0cdd942261497fb8922a194b4da3315ae864
  3. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <52f72b3f8f6fa64abb71b711962b97f1f6aced1c
  4. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <a825691b804b35141aaf4eac91003a70846e316d
  5. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <be3f38d05cc5a7c3f13e51994c5dd043ab604d28
  6. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <e7af1b15c884ed12bb69da11aec095045d861ee8
  7. Affected versionversion=999dad824c39ed14dee7c4412aae531ba9e74a90 <e81446b559db4c98a6c2c5e039ac9cb23658432e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <2fff0cdd942261497fb8922a194b4da3315ae864; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <52f72b3f8f6fa64abb71b711962b97f1f6aced1c; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <a825691b804b35141aaf4eac91003a70846e316d; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <be3f38d05cc5a7c3f13e51994c5dd043ab604d28; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <e7af1b15c884ed12bb69da11aec095045d861ee8; version=999dad824c39ed14dee7c4412aae531ba9e74a90 <e81446b559db4c98a6c2c5e039ac9cb23658432e

Published CVSS scores

5.5NVDCVSS: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.

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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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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