CVE-2026-31522

Kernel-memory exhaustion via leaked report descriptor

Published Apr 22, 2026 · Updated Apr 22, 2026

Memory leak in the Linux kernel HID magicmouse driver allows local users to exhaust kernel memory through repeated device initialization. The magicmouse_report_fixup() function returns a newly kmemdup()-allocated report-descriptor buffer even though report_fixup() callers do not take ownership, leaving each allocation unreleased. Exploitation requires local low-privileged access; the resulting resource loss affects availability, with no reported ability to read or modify data.

CVSS severity5.5
Medium
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

Memory leak in the Linux kernel HID magicmouse driver allows local users to exhaust kernel memory through repeated device initialization. The magicmouse_report_fixup() function returns a newly kmemdup()-allocated report-descriptor buffer even though report_fixup() callers do not take ownership, leaving each allocation unreleased. Exploitation requires local low-privileged access; the resulting resource loss affects availability, with no reported ability to read or modify data.

The record

CVE
CVE-2026-31522
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <136f605e246b4bfe7ac2259471d1ff814aed0084
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <579c4c9857acdc8380fa99803f355f878bd766cb
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79e5dcc95d9abed6f8203cfd529f4ec71f0e505d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7edfe4346b052b708645d0acc0f186425766b785
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91e8c6e601bdc1ccdf886479b6513c01c7e51c2c
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d84c21aabaab517b9aaf9bc1d785922cb9db2f31
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fa95b0146358b49f9858139b67314591fd5871b0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <136f605e246b4bfe7ac2259471d1ff814aed0084; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <579c4c9857acdc8380fa99803f355f878bd766cb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79e5dcc95d9abed6f8203cfd529f4ec71f0e505d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7edfe4346b052b708645d0acc0f186425766b785; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91e8c6e601bdc1ccdf886479b6513c01c7e51c2c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d84c21aabaab517b9aaf9bc1d785922cb9db2f31; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fa95b0146358b49f9858139b67314591fd5871b0

Published CVSS scores

5.5NIST NVDCVSS: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-401Missing Release of Memory after Effective Lifetime
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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