CVE-2026-80817

Kernel Oops via iommufd page-mapping race

Published Sep 4, 2026 · Updated Sep 4, 2026

NULL pointer dereference in Linux 6.13 allows local users to trigger a kernel Oops by racing iommufd process changes with page mapping. iopt_map_pages inserts an IOAS area into the interval tree before populating area->pages, while iommufd_ioas_change_process dereferences that pointer during the exposed locking window. Reachability requires local access to an iommufd file descriptor and precise concurrency; the demonstrated consequence is a kernel Oops.

CVSS severityUnavailable
Unscored
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

NULL pointer dereference in Linux 6.13 allows local users to trigger a kernel Oops by racing iommufd process changes with page mapping. iopt_map_pages inserts an IOAS area into the interval tree before populating area->pages, while iommufd_ioas_change_process dereferences that pointer during the exposed locking window. Reachability requires local access to an iommufd file descriptor and precise concurrency; the demonstrated consequence is a kernel Oops.

The record

CVE
CVE-2026-80817
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=6.13
  2. Affected versionversion=829ed626499c11c9d11c65e93febc1e0da7cd61b <7596354148c5aa12dfaa17992d1aef1aa2ea831a
  3. Affected versionversion=829ed626499c11c9d11c65e93febc1e0da7cd61b <d616de490ec0242dcf78f02f1adf7baa035c4d0d
  4. Affected versionversion=829ed626499c11c9d11c65e93febc1e0da7cd61b <d9635e2507dc8260b9ba9992a4198e84f9340a15
  5. Affected versionversion=829ed626499c11c9d11c65e93febc1e0da7cd61b <ffe6d379be20df013e19a4c63dd80bc6b683106d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.13; version=829ed626499c11c9d11c65e93febc1e0da7cd61b <7596354148c5aa12dfaa17992d1aef1aa2ea831a; version=829ed626499c11c9d11c65e93febc1e0da7cd61b <d616de490ec0242dcf78f02f1adf7baa035c4d0d; version=829ed626499c11c9d11c65e93febc1e0da7cd61b <d9635e2507dc8260b9ba9992a4198e84f9340a15; version=829ed626499c11c9d11c65e93febc1e0da7cd61b <ffe6d379be20df013e19a4c63dd80bc6b683106d

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application 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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