CVE-2026-72133

System instability via uninitialized IRQ completion

Published Aug 15, 2026 · Updated Aug 15, 2026

Use of an uninitialized completion in the Linux kernel UniPhier SPI driver allows local users to trigger undefined behavior via an IRQ race. The probe path registers its handler with devm_request_irq() before init_completion(), so an immediate interrupt lets the handler call complete() on an uninitialized object. The race requires the UniPhier SPI driver and corresponding hardware; resulting undefined behavior includes system instability or a crash.

CVSS severity8.4
High
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

Use of an uninitialized completion in the Linux kernel UniPhier SPI driver allows local users to trigger undefined behavior via an IRQ race. The probe path registers its handler with devm_request_irq() before init_completion(), so an immediate interrupt lets the handler call complete() on an uninitialized object. The race requires the UniPhier SPI driver and corresponding hardware; resulting undefined behavior includes system instability or a crash.

The record

CVE
CVE-2026-72133
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.19
  2. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <077a7bc1c32d3da9670c5e282ea3e5ac8a94be59
  3. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <49f6705d80b5e6175d8435d9c72b66bd516a8e89
  4. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <82a5746c4c9e94f6f816ec7edea6ddc24417c6a5
  5. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <8b5798ce0007874c14611b8ee4ce6c749855260e
  6. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <b9fcf0db433d79648ace74bc2b8b88f91e306304
  7. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <d44b828eb551bd59ba9f22457825cc3db3a39fc1
  8. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <f3ad1c87d8201e54b66bd6072442f0b5d5a308ee
  9. Affected versionversion=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <f4bb0a91f7badd6d15ac8d783a1169d9e1e95c17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <077a7bc1c32d3da9670c5e282ea3e5ac8a94be59; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <49f6705d80b5e6175d8435d9c72b66bd516a8e89; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <82a5746c4c9e94f6f816ec7edea6ddc24417c6a5; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <8b5798ce0007874c14611b8ee4ce6c749855260e; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <b9fcf0db433d79648ace74bc2b8b88f91e306304; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <d44b828eb551bd59ba9f22457825cc3db3a39fc1; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <f3ad1c87d8201e54b66bd6072442f0b5d5a308ee; version=5ba155a4d4cc8e4cdd3db6df7d03271a3bd91177 <f4bb0a91f7badd6d15ac8d783a1169d9e1e95c17

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
8.4Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.7SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

CWE-908Use of Uninitialized Resource
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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