CVE-2026-43317

Service interruption via leaked MOST interface resources

Published May 8, 2026 · Updated May 8, 2026

Memory leak in the Linux Kernel MOST core allows local users to interrupt service through failed interface registration. The most_register_interface() validation path calls device_initialize() but returns -EINVAL for missing callbacks or excessive channels without calling put_device(), leaving the interface allocation referenced. Reachability requires local low-privileged access and a MOST driver registration failure; the published impact is memory exhaustion and service interruption, without data access or modification.

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 MOST core allows local users to interrupt service through failed interface registration. The most_register_interface() validation path calls device_initialize() but returns -EINVAL for missing callbacks or excessive channels without calling put_device(), leaving the interface allocation referenced. Reachability requires local low-privileged access and a MOST driver registration failure; the published impact is memory exhaustion and service interruption, without data access or modification.

The record

CVE
CVE-2026-43317
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=5.6
  2. Affected versionversion=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <2c198c272f9c9213b0fdf6b4a879f445c574f416
  3. Affected versionversion=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <5fd4396c2e48e90cc2597a86c18227d56ea845f0
  4. Affected versionversion=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <bbfe49ffb892bddf32c34bea95b7ff0fc30affb5
  5. Affected versionversion=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <f1ba620f9e8d7291f80c0554e4b820f5fb30e819

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <2c198c272f9c9213b0fdf6b4a879f445c574f416; version=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <5fd4396c2e48e90cc2597a86c18227d56ea845f0; version=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <bbfe49ffb892bddf32c34bea95b7ff0fc30affb5; version=723de0f9171eeb49a3ae98cae82ebbbb992b3a7c <f1ba620f9e8d7291f80c0554e4b820f5fb30e819

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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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