CVE-2026-31527

Root-triggered kernel use-after-free via unlocked driver override

Published Apr 22, 2026 · Updated Apr 22, 2026

Use-after-free in the Linux Kernel platform driver core allows local users with root privileges to trigger unsafe kernel memory access. During __driver_attach probing, the platform bus match callback reads driver_override without the device lock, allowing a concurrent sysfs write to free the referenced value. Ubuntu identifies the root-owned driver_override write as the gate; upstream has not published a demonstrated consequence beyond the use-after-free condition.

CVSS severity7.8
High
EPSS probability0.13%
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 Linux Kernel platform driver core allows local users with root privileges to trigger unsafe kernel memory access. During __driver_attach probing, the platform bus match callback reads driver_override without the device lock, allowing a concurrent sysfs write to free the referenced value. Ubuntu identifies the root-owned driver_override write as the gate; upstream has not published a demonstrated consequence beyond the use-after-free condition.

The record

CVE
CVE-2026-31527
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
admin

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

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=3.17
  2. Affected versionversion=3d713e0e382e6fcfb4bba1501645b66c129ad60b <2b38efc05bf7a8568ec74bfffea0f5cfa62bc01d
  3. Affected versionversion=3d713e0e382e6fcfb4bba1501645b66c129ad60b <7c02a9bd7d14a89065fcf672b86d8e1d1a41d3b1
  4. Affected versionversion=3d713e0e382e6fcfb4bba1501645b66c129ad60b <9a6086d2a828dd2ff74cf9abcae456670febd71f
  5. Affected versionversion=3d713e0e382e6fcfb4bba1501645b66c129ad60b <edee7ee5a14c3b33f6d54641f5af5c5e9180992d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.17; version=3d713e0e382e6fcfb4bba1501645b66c129ad60b <2b38efc05bf7a8568ec74bfffea0f5cfa62bc01d; version=3d713e0e382e6fcfb4bba1501645b66c129ad60b <7c02a9bd7d14a89065fcf672b86d8e1d1a41d3b1; version=3d713e0e382e6fcfb4bba1501645b66c129ad60b <9a6086d2a828dd2ff74cf9abcae456670febd71f; version=3d713e0e382e6fcfb4bba1501645b66c129ad60b <edee7ee5a14c3b33f6d54641f5af5c5e9180992d

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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