CVE-2025-71122

Interval-tree corruption via test ioctl overflow

Published Jan 14, 2026 · Updated Jan 14, 2026

Integer overflow in the Linux Kernel iommufd selftest allows local users to corrupt its reserved interval tree through a test ioctl. The iommufd_test_add_reserved function computes start plus length minus one without rejecting zero or overflowing lengths, then passes the wrapped endpoint to iopt_reserve_iova. The ioctl is exposed only in kernels built with CONFIG_IOMMUFD_TEST, and a crafted length can trigger a kernel WARN_ON after interval-tree corruption.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the Linux Kernel iommufd selftest allows local users to corrupt its reserved interval tree through a test ioctl. The iommufd_test_add_reserved function computes start plus length minus one without rejecting zero or overflowing lengths, then passes the wrapped endpoint to iopt_reserve_iova. The ioctl is exposed only in kernels built with CONFIG_IOMMUFD_TEST, and a crafted length can trigger a kernel WARN_ON after interval-tree corruption.

The record

CVE
CVE-2025-71122
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 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=f4b20bb34c83dceade5470288f48f94ce3598ada <4cc829d61f10c20523fd4085c1546e741a792a97
  3. Affected versionversion=f4b20bb34c83dceade5470288f48f94ce3598ada <b166b8e0a381429fefd9180e67fbc834b3cee82f
  4. Affected versionversion=f4b20bb34c83dceade5470288f48f94ce3598ada <e6a973af11135439de32ece3b9cbe3bfc043bea8
  5. Affected versionversion=f4b20bb34c83dceade5470288f48f94ce3598ada <e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=f4b20bb34c83dceade5470288f48f94ce3598ada <4cc829d61f10c20523fd4085c1546e741a792a97; version=f4b20bb34c83dceade5470288f48f94ce3598ada <b166b8e0a381429fefd9180e67fbc834b3cee82f; version=f4b20bb34c83dceade5470288f48f94ce3598ada <e6a973af11135439de32ece3b9cbe3bfc043bea8; version=f4b20bb34c83dceade5470288f48f94ce3598ada <e6c122cffcbb2e84d321ec8ba0e38ce8e7c10925

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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