CVE-2026-89815

Kernel fault via stale restore state

Published Sep 16, 2026 · Updated Sep 16, 2026

Improper restore-state cleanup in Linux 6.15 allows local users to trigger a kernel fault through repeated TTM backup and restore flows. After ttm_pool_restore_commit succeeds, ttm_pool_restore_and_alloc leaves tt->restore allocated while shmem handles remain installed in tt->pages, so later flows treat stale state as completed. The path is reached through local DRM ioctl activity using the Xe graphics driver; the published evidence shows a kernel stack trace but no broader impact.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper restore-state cleanup in Linux 6.15 allows local users to trigger a kernel fault through repeated TTM backup and restore flows. After ttm_pool_restore_commit succeeds, ttm_pool_restore_and_alloc leaves tt->restore allocated while shmem handles remain installed in tt->pages, so later flows treat stale state as completed. The path is reached through local DRM ioctl activity using the Xe graphics driver; the published evidence shows a kernel stack trace but no broader impact.

The record

CVE
CVE-2026-89815
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <941ac10529b3be5965a88d432a161ab459672ba8
  3. Affected versionversion=b63d715b8090aed48bdef5930625946fa4c0d324 <a46ab76b6cf5478e2ac7b942a377c7a1827b436a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=b63d715b8090aed48bdef5930625946fa4c0d324 <941ac10529b3be5965a88d432a161ab459672ba8; version=b63d715b8090aed48bdef5930625946fa4c0d324 <a46ab76b6cf5478e2ac7b942a377c7a1827b436a

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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