CVE-2026-68430

Kernel crash via 64-bit KIQ fence assertion

Published Aug 12, 2026 · Updated Aug 12, 2026

Reachable assertion in Linux 6.6 before 6.6.148, 6.12 before 6.12.101, 6.18 before 6.18.42, and 7.1 before 7.1.6 allows local users to crash the kernel. The gfx_v8_0_ring_emit_fence_kiq function invokes BUG_ON when AMDGPU_FENCE_FLAG_64BIT is set instead of handling the unsupported fence mode. Local access, the loaded amdgpu driver, and AMD GFX8 GPU hardware are required; triggering the assertion makes the system unresponsive.

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

Reachable assertion in Linux 6.6 before 6.6.148, 6.12 before 6.12.101, 6.18 before 6.18.42, and 7.1 before 7.1.6 allows local users to crash the kernel. The gfx_v8_0_ring_emit_fence_kiq function invokes BUG_ON when AMDGPU_FENCE_FLAG_64BIT is set instead of handling the unsupported fence mode. Local access, the loaded amdgpu driver, and AMD GFX8 GPU hardware are required; triggering the assertion makes the system unresponsive.

The record

CVE
CVE-2026-68430
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=0 <6.12.101
  2. Affected versionversion=0 <6.18.42
  3. Affected versionversion=0 <6.6.148
  4. Affected versionversion=0 <7.1.6
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2404600dca5c0979485c6f2d9c62bd356a98870a
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84a1a8a952ab4b8c23c5dd1f2eea4049cb4914f5
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab05af6c345bc8460052c60de657ce6d4a2386f7
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db85aa861b8214fa0d1d8405c01488f604a455a0
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f70bd5235d9efc2ee2f70293eea51888c5f2a54d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.12.101; version=0 <6.18.42; version=0 <6.6.148; version=0 <7.1.6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2404600dca5c0979485c6f2d9c62bd356a98870a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84a1a8a952ab4b8c23c5dd1f2eea4049cb4914f5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab05af6c345bc8460052c60de657ce6d4a2386f7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db85aa861b8214fa0d1d8405c01488f604a455a0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f70bd5235d9efc2ee2f70293eea51888c5f2a54d

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

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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

CWE-617Reachable Assertion

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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