CVE-2026-68249

Kernel crash via misaligned SDMA fence address

Published Aug 10, 2026 · Updated Aug 10, 2026

Denial of service in Linux kernel amdgpu SDMA 5.0 allows local users to crash the kernel via a misaligned fence address. The sdma_v5_0_ring_emit_fence function invokes BUG_ON twice when the fence address has either low alignment bit set, turning that condition into a kernel-fatal assertion. Reachability requires local low-privileged access and an affected AMD GPU using SDMA 5.0; the bounded consequence is a kernel crash.

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

Denial of service in Linux kernel amdgpu SDMA 5.0 allows local users to crash the kernel via a misaligned fence address. The sdma_v5_0_ring_emit_fence function invokes BUG_ON twice when the fence address has either low alignment bit set, turning that condition into a kernel-fatal assertion. Reachability requires local low-privileged access and an affected AMD GPU using SDMA 5.0; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-68249
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

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=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 <0027cb19b0449ad6babedb1af285a713ab05c97f
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28337e5d7df429bac7de64b17f1a595147778caa
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e98ed3113943257ad6e5c1e6beddbdb482a70ad
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d20b5c139b2906bcd8ab4bfe5b8be500318161d1
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6212bc1bbd936fd9f7d77168b0c8b0019477b64

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 <0027cb19b0449ad6babedb1af285a713ab05c97f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <28337e5d7df429bac7de64b17f1a595147778caa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e98ed3113943257ad6e5c1e6beddbdb482a70ad; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d20b5c139b2906bcd8ab4bfe5b8be500318161d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f6212bc1bbd936fd9f7d77168b0c8b0019477b64

Published CVSS scores

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

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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