CVE-2026-31487

Local service interruption via unlocked SPI override access

Published Apr 22, 2026 · Updated Apr 22, 2026

Use-after-free in Linux Kernel SPI support allows local users to interrupt service by racing driver probing with an override update. The SPI bus match callback reads driver_override without holding the device lock while __driver_attach probes a driver, allowing concurrent replacement to free the referenced string. Local low-privileged access is required; the published record does not specify whether the resulting kernel service interruption is a crash or a hang.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel SPI support allows local users to interrupt service by racing driver probing with an override update. The SPI bus match callback reads driver_override without holding the device lock while __driver_attach probes a driver, allowing concurrent replacement to free the referenced string. Local low-privileged access is required; the published record does not specify whether the resulting kernel service interruption is a crash or a hang.

The record

CVE
CVE-2026-31487
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=4.20
  2. Affected versionversion=5039563e7c25eccd7fec1de6706011009d1c5665 <c73a58661a760373d08a6883af4f0bb5cc991a67
  3. Affected versionversion=5039563e7c25eccd7fec1de6706011009d1c5665 <cc34d77dd48708d810c12bfd6f5bf03304f6c824
  4. Affected versionversion=5039563e7c25eccd7fec1de6706011009d1c5665 <e0ae367a2de06c49aa1de6ec9b1ab6860bbb2cf0
  5. Affected versionversion=5039563e7c25eccd7fec1de6706011009d1c5665 <eedf220442d13b6d97294e5b0ac8a2c38ee1a1a0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.20; version=5039563e7c25eccd7fec1de6706011009d1c5665 <c73a58661a760373d08a6883af4f0bb5cc991a67; version=5039563e7c25eccd7fec1de6706011009d1c5665 <cc34d77dd48708d810c12bfd6f5bf03304f6c824; version=5039563e7c25eccd7fec1de6706011009d1c5665 <e0ae367a2de06c49aa1de6ec9b1ab6860bbb2cf0; version=5039563e7c25eccd7fec1de6706011009d1c5665 <eedf220442d13b6d97294e5b0ac8a2c38ee1a1a0

Published CVSS scores

5.5NVDCVSS: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.

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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-667Improper Locking
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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