CVE-2026-31389

Local kernel compromise via stale SPI controller

Published Apr 3, 2026 · Updated Apr 3, 2026

Use-after-free in the SPI controller registration path in Linux Kernel allows local users to compromise kernel memory after failed setup. When per-CPU statistics allocation fails, spi_register_controller omits device_del(), leaving the controller registered while cleanup releases associated resources. Reachability requires local device-management access and the uncommon allocation failure; subsequent stale accesses can disclose or corrupt kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.12%
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 the SPI controller registration path in Linux Kernel allows local users to compromise kernel memory after failed setup. When per-CPU statistics allocation fails, spi_register_controller omits device_del(), leaving the controller registered while cleanup releases associated resources. Reachability requires local device-management access and the uncommon allocation failure; subsequent stale accesses can disclose or corrupt kernel memory or crash the system.

The record

CVE
CVE-2026-31389
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=6.0
  2. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <0e23f50086da7d0b183dfeac26021acfcdee086b
  3. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <23b51bad2eb8787aa74324cfccefb258515ae5ba
  4. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <6bbd385b30c7fb6c7ee0669e9ada91490938c051
  5. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <80f3e8cd2b4ad355b2ad2024cf423f6d183404f7
  6. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <8634e05b08ead636e926022f4a98416e13440df9
  7. Affected versionversion=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <afe27c1f43aa57530011f419be6ddf71306565d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <0e23f50086da7d0b183dfeac26021acfcdee086b; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <23b51bad2eb8787aa74324cfccefb258515ae5ba; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <6bbd385b30c7fb6c7ee0669e9ada91490938c051; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <80f3e8cd2b4ad355b2ad2024cf423f6d183404f7; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <8634e05b08ead636e926022f4a98416e13440df9; version=6598b91b5ac32bc756d7c3000a31f775d4ead1c4 <afe27c1f43aa57530011f419be6ddf71306565d2

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS: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

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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-416Use After Free
T1068Exploitation for Privilege Escalation

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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