CVE-2026-68239

Kernel crash via unchecked backup-page entries

Published Aug 10, 2026 · Updated Aug 10, 2026

NULL-pointer dereference in Linux kernel 6.15 allows local users to crash affected systems during TTM memory-pressure shrinking. ttm_pool_backup passes NULL or encoded backup-handle entries to set_pages_array_wb and later frees them without filtering non-page values. Exploitation requires local low-privileged access, high-complexity memory-pressure conditions, and a TTM-backed graphics path; the reported result is a kernel oops that interrupts the system.

CVSS severity4.7
Medium
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

NULL-pointer dereference in Linux kernel 6.15 allows local users to crash affected systems during TTM memory-pressure shrinking. ttm_pool_backup passes NULL or encoded backup-handle entries to set_pages_array_wb and later frees them without filtering non-page values. Exploitation requires local low-privileged access, high-complexity memory-pressure conditions, and a TTM-backed graphics path; the reported result is a kernel oops that interrupts the system.

The record

CVE
CVE-2026-68239
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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

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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=6.15
  2. Affected versionversion=b63d715b8090aed48bdef5930625946fa4c0d324 <22aa7fb4e7d0b3ab41d1240ed743167980912970
  3. Affected versionversion=b63d715b8090aed48bdef5930625946fa4c0d324 <5b7b3b6595ee77d01c7463757baed114786094dd
  4. Affected versionversion=b63d715b8090aed48bdef5930625946fa4c0d324 <9ddaabf38f7a45b329e34358b98d2968d8649d21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=b63d715b8090aed48bdef5930625946fa4c0d324 <22aa7fb4e7d0b3ab41d1240ed743167980912970; version=b63d715b8090aed48bdef5930625946fa4c0d324 <5b7b3b6595ee77d01c7463757baed114786094dd; version=b63d715b8090aed48bdef5930625946fa4c0d324 <9ddaabf38f7a45b329e34358b98d2968d8649d21

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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

T1499Endpoint Denial of Service

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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