CVE-2026-43155

Local service interruption via leaked MMIO regmap

Published May 6, 2026 · Updated May 6, 2026

Memory leak in the Linux Kernel MMIO mux driver 6.16 through 6.18.15 and 6.19 through 6.19.5 allows local users to interrupt service. The mux_mmio_probe path initializes an MMIO regmap without device-managed ownership, so probe deferral or driver unbind leaves the allocation unreleased. Exploitation requires local low-privilege access and affected MMIO mux hardware; repeated reachable failures can exhaust memory and interrupt service.

CVSS severity5.5
Medium
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

Memory leak in the Linux Kernel MMIO mux driver 6.16 through 6.18.15 and 6.19 through 6.19.5 allows local users to interrupt service. The mux_mmio_probe path initializes an MMIO regmap without device-managed ownership, so probe deferral or driver unbind leaves the allocation unreleased. Exploitation requires local low-privilege access and affected MMIO mux hardware; repeated reachable failures can exhaust memory and interrupt service.

The record

CVE
CVE-2026-43155
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=6.16
  2. Affected versionversion=61de83fd8256e185588670d3cf0bccc3e913819c <3c4ae63073d84abee5d81ce46d86a94e9dae9c89
  3. Affected versionversion=61de83fd8256e185588670d3cf0bccc3e913819c <76096f156fe9dc9fbd6e4618088706e91b9b0a6c
  4. Affected versionversion=61de83fd8256e185588670d3cf0bccc3e913819c <cbde3c109d52564ae2c12e514c33c44345e84b2c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=61de83fd8256e185588670d3cf0bccc3e913819c <3c4ae63073d84abee5d81ce46d86a94e9dae9c89; version=61de83fd8256e185588670d3cf0bccc3e913819c <76096f156fe9dc9fbd6e4618088706e91b9b0a6c; version=61de83fd8256e185588670d3cf0bccc3e913819c <cbde3c109d52564ae2c12e514c33c44345e84b2c

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
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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