CVE-2025-68193

Kernel crash via premature CTB buffer release

Published Dec 16, 2025 · Updated Dec 16, 2025

Use-after-free in the Xe GuC driver in Linux 6.10 through 6.17.7 allows local users to crash the system during buffer-object release. The teardown path frees the CTB buffer before disabling CTB, so GGTT TLB invalidation can call h2g_write through released storage. The path requires the Xe GPU driver and a buffer object carrying XE_BO_FLAG_GGTT_INVALIDATE; exploitation interrupts the host rather than exposing or modifying data.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Xe GuC driver in Linux 6.10 through 6.17.7 allows local users to crash the system during buffer-object release. The teardown path frees the CTB buffer before disabling CTB, so GGTT TLB invalidation can call h2g_write through released storage. The path requires the Xe GPU driver and a buffer object carrying XE_BO_FLAG_GGTT_INVALIDATE; exploitation interrupts the host rather than exposing or modifying data.

The record

CVE
CVE-2025-68193
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52faa05fcd9f78af99abebe30a4b7b444744c991
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee4b32220a6b41e71512e8804585325e685456ba

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52faa05fcd9f78af99abebe30a4b7b444744c991; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee4b32220a6b41e71512e8804585325e685456ba

Published CVSS scores

5.5Amazon LinuxCVSS: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

T1499.004Application 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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