CVE-2026-68163

Memory corruption via device-private PMD misclassification

Published Aug 10, 2026 · Updated Aug 10, 2026

Type confusion in the Linux memory manager allows local users to corrupt kernel memory through device-private PMD mappings. The page_vma_mapped_walk() path omits check_pmd() and treats a device-private entry as a migration entry when PVMW_MIGRATION is set. Device-private memory with PMD-sized entries is required; incorrect interpretation or a concurrent PMD split corrupts memory or crashes the system.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in the Linux memory manager allows local users to corrupt kernel memory through device-private PMD mappings. The page_vma_mapped_walk() path omits check_pmd() and treats a device-private entry as a migration entry when PVMW_MIGRATION is set. Device-private memory with PMD-sized entries is required; incorrect interpretation or a concurrent PMD split corrupts memory or crashes the system.

The record

CVE
CVE-2026-68163
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-843, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=65edfda6f3f2e58f757485a056e4f1775a1404a8 <ab6209f4b48a98ef14d6766acdb62aa9bb32e670
  3. Affected versionversion=65edfda6f3f2e58f757485a056e4f1775a1404a8 <f84ca9b1888d8fce7dfefe0e750fa971f8797486

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=65edfda6f3f2e58f757485a056e4f1775a1404a8 <ab6209f4b48a98ef14d6766acdb62aa9bb32e670; version=65edfda6f3f2e58f757485a056e4f1775a1404a8 <f84ca9b1888d8fce7dfefe0e750fa971f8797486

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.8Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8cve.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1068Exploitation for Privilege Escalation

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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