CVE-2026-43372

Service interruption via leaked PTP IRQ mappings

Published May 8, 2026 · Updated May 8, 2026

Resource leak in affected Linux Kernel releases allows local users to interrupt service through a failed Microchip PTP IRQ setup. In drivers/net/dsa/microchip/ksz_ptp.c, ksz_ptp_irq_setup() creates an IRQ mapping before request_threaded_irq() and fails to dispose that new mapping when the request fails. Reachability requires local low-privileged access, the Microchip DSA PTP path, and an IRQ-request failure; the public record does not identify how a user can force that failure.

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

Resource leak in affected Linux Kernel releases allows local users to interrupt service through a failed Microchip PTP IRQ setup. In drivers/net/dsa/microchip/ksz_ptp.c, ksz_ptp_irq_setup() creates an IRQ mapping before request_threaded_irq() and fails to dispose that new mapping when the request fails. Reachability requires local low-privileged access, the Microchip DSA PTP path, and an IRQ-request failure; the public record does not identify how a user can force that failure.

The record

CVE
CVE-2026-43372
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
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=1ba6da6ca3db76f6a39004fd33a9c990e428515e <e80fef36c676c947072dabeb5803ae59d92ba493
  2. Affected versionversion=3b5a6115d6ea45df1ea65dc9b832b23db5d593ba <3704ac6a0d9a78f66a187515a8ca3faedaf01cc5
  3. Affected versionversion=6.18
  4. Affected versionversion=ae12e4e0ca231475bcef841c6a6722fa185fd520
  5. Affected versionversion=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <6c58a9fdb0d0e1011aa02455d26d6ebea251979b
  6. Affected versionversion=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <99c8c16a4aad0b37293cae213e15957c573cf79b
  7. Affected versionversion=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <c2d1d41e0e8ec447d40a5752844fc5fb0b23db27

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1ba6da6ca3db76f6a39004fd33a9c990e428515e <e80fef36c676c947072dabeb5803ae59d92ba493; version=3b5a6115d6ea45df1ea65dc9b832b23db5d593ba <3704ac6a0d9a78f66a187515a8ca3faedaf01cc5; version=6.18; version=ae12e4e0ca231475bcef841c6a6722fa185fd520; version=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <6c58a9fdb0d0e1011aa02455d26d6ebea251979b; version=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <99c8c16a4aad0b37293cae213e15957c573cf79b; version=d0b8fec8ae50525b57139393d0bb1f446e82ff7e <c2d1d41e0e8ec447d40a5752844fc5fb0b23db27

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

T1499.004Application or System Exploitation

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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