CVE-2026-89451

System crash via incompletely initialized SVA handle

Published Sep 11, 2026 · Updated Sep 11, 2026

Race condition in the Linux kernel IOMMU SVA subsystem allows attackers to crash the system through concurrent device binding and unbinding. iommu_sva_bind_device() releases iommu_sva_lock after making the handle visible but before setting handle->dev, so a racing bind can reuse a handle with a NULL device pointer. A subsequent unbind dereferences handle->dev->iommu_group; exploitation requires the bind race and an SVA-capable device path.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel IOMMU SVA subsystem allows attackers to crash the system through concurrent device binding and unbinding. iommu_sva_bind_device() releases iommu_sva_lock after making the handle visible but before setting handle->dev, so a racing bind can reuse a handle with a NULL device pointer. A subsequent unbind dereferences handle->dev->iommu_group; exploitation requires the bind race and an SVA-capable device path.

The record

CVE
CVE-2026-89451
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=6.2
  2. Affected versionversion=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <37a96a30617a4c96f048a5874c00509bc4fe4d85
  3. Affected versionversion=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <530f8f9c3546cb3ebee1b135375aaee08a073ebb
  4. Affected versionversion=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <968e9a1f71140c86dc4092f6b361e997923f3813
  5. Affected versionversion=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <bcffb1c75da8fc9d51168ff9f09d471c26507912

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <37a96a30617a4c96f048a5874c00509bc4fe4d85; version=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <530f8f9c3546cb3ebee1b135375aaee08a073ebb; version=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <968e9a1f71140c86dc4092f6b361e997923f3813; version=be51b1d6bbff48c7d1943a8ff1e5a55777807f6e <bcffb1c75da8fc9d51168ff9f09d471c26507912

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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