CVE-2026-43447

Local system crash via PTP teardown race

Published May 8, 2026 · Updated May 8, 2026

Use-after-free in affected Linux kernel iavf releases from 6.15 to 7.0-rc3 allows local users to crash the system during reset. The iavf_reset_task() and iavf_disable_vf() teardown paths free adapter resources while the PTP worker can still call iavf_queue_ptp_cmd() and dereference freed memory and locks. Exploitation requires CAP_NET_ADMIN access to an iavf virtual function with PTP support; the documented consequence is a kernel crash.

CVSS severity7.8
High
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

Use-after-free in affected Linux kernel iavf releases from 6.15 to 7.0-rc3 allows local users to crash the system during reset. The iavf_reset_task() and iavf_disable_vf() teardown paths free adapter resources while the PTP worker can still call iavf_queue_ptp_cmd() and dereference freed memory and locks. Exploitation requires CAP_NET_ADMIN access to an iavf virtual function with PTP support; the documented consequence is a kernel crash.

The record

CVE
CVE-2026-43447
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, 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=6.15
  2. Affected versionversion=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <1b034f2429ce6b45ce74dc266175d277acafc5c4
  3. Affected versionversion=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <90cc8b2add29b57288025b51c70bc647e7cccb12
  4. Affected versionversion=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <efc54fb13d79117a825fef17364315a58682c7ec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <1b034f2429ce6b45ce74dc266175d277acafc5c4; version=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <90cc8b2add29b57288025b51c70bc647e7cccb12; version=7c01dbfc8a1c5f8b8e4a7907ab06db1449d478d0 <efc54fb13d79117a825fef17364315a58682c7ec

Published CVSS scores

7.8kernel.orgCVSS: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.

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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-416Use After Free
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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