CVE-2026-68324

Local system crash via oversized IOMMU memset

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds write in the Intel IOMMU driver in Linux allows local users to crash systems through DMAR latency statistics. The dmar_latency_disable() function clears sizeof(*lstat) * DMAR_LATENCY_NUM bytes from &lstat[type] instead of one entry, so any type above zero overruns the array. Exploitation requires local low-privileged access and Intel VT-d DMAR latency support; the published impact is a system crash, not data disclosure or alteration.

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

Out-of-bounds write in the Intel IOMMU driver in Linux allows local users to crash systems through DMAR latency statistics. The dmar_latency_disable() function clears sizeof(*lstat) * DMAR_LATENCY_NUM bytes from &lstat[type] instead of one entry, so any type above zero overruns the array. Exploitation requires local low-privileged access and Intel VT-d DMAR latency support; the published impact is a system crash, not data disclosure or alteration.

The record

CVE
CVE-2026-68324
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, 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

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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=5.14
  2. Affected versionversion=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <0e28ca1c3204b51068579defc904a0dfba5e5c57
  3. Affected versionversion=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <3078d82e7fe9048a2b90a992e71af7cd7ef881fa
  4. Affected versionversion=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <754f8efe45f87e3a9c6871b645b2f9d46d1b407b
  5. Affected versionversion=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <866a35735e56b9dc81cbc33899255134adf6d8b3
  6. Affected versionversion=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <d06fea9b85f038690f55e72fe0c45e113715a85a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <0e28ca1c3204b51068579defc904a0dfba5e5c57; version=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <3078d82e7fe9048a2b90a992e71af7cd7ef881fa; version=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <754f8efe45f87e3a9c6871b645b2f9d46d1b407b; version=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <866a35735e56b9dc81cbc33899255134adf6d8b3; version=55ee5e67a59a1b6f388d7a1c7b24022145f47a3e <d06fea9b85f038690f55e72fe0c45e113715a85a

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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