CVE-2026-68238

Service degradation via unreleased VFCT table references

Published Aug 10, 2026 · Updated Aug 25, 2026

Resource leak in Linux before 6.18.42 or 7.1.6 allows local users to degrade availability on AMDGPU systems using VFCT tables. The amdgpu_acpi_vfct_bios() path calls acpi_get_table() but omits the matching acpi_put_table(), retaining the reference and mapping on every invocation. The flaw is reachable only on systems with AMD GPUs that use VFCT ACPI tables for VBIOS, where repeated calls consume resources and impair system stability.

CVSS severity5.5
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

Resource leak in Linux before 6.18.42 or 7.1.6 allows local users to degrade availability on AMDGPU systems using VFCT tables. The amdgpu_acpi_vfct_bios() path calls acpi_get_table() but omits the matching acpi_put_table(), retaining the reference and mapping on every invocation. The flaw is reachable only on systems with AMD GPUs that use VFCT ACPI tables for VBIOS, where repeated calls consume resources and impair system stability.

The record

CVE
CVE-2026-68238
Published
Aug 10, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=4.2
  2. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <312278b3091912fa56a6a587609f17dcb33465c2
  3. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <65bff26617607c1331283232016c0e89088c5b78
  4. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <9b7de3ee5d2c5ee2a706e5f7ca0126f4fbea4da8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <312278b3091912fa56a6a587609f17dcb33465c2; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <65bff26617607c1331283232016c0e89088c5b78; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <9b7de3ee5d2c5ee2a706e5f7ca0126f4fbea4da8

Published CVSS scores

2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
5.5Red HatCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.001OS Exhaustion Flood

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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