CVE-2026-43346

Local guest crash via unexpected PTP assertion

Published May 8, 2026 · Updated May 8, 2026

Reachable assertion in the ice PTP driver in Linux Kernel allows local users to crash a VFIO guest during physical-function setup. When adapter->ctrl_pf is uninitialized because the passed-through PF does not own the source timer, ice_get_ctrl_ptp() returns NULL and ice_ptp_setup_pf() invokes WARN_ON() instead of treating the state as unsupported. The path requires a VFIO guest receiving only the noncontrolling PF, and a crash requires a configuration that converts kernel warnings into panics.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the ice PTP driver in Linux Kernel allows local users to crash a VFIO guest during physical-function setup. When adapter->ctrl_pf is uninitialized because the passed-through PF does not own the source timer, ice_get_ctrl_ptp() returns NULL and ice_ptp_setup_pf() invokes WARN_ON() instead of treating the state as unsupported. The path requires a VFIO guest receiving only the noncontrolling PF, and a crash requires a configuration that converts kernel warnings into panics.

The record

CVE
CVE-2026-43346
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-617, 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=2f59743be4d9568cad2d9cf697d1b897975421ed
  2. Affected versionversion=6.13
  3. Affected versionversion=e800654e85b5b27966fc6493201f5f8cf658beb6 <bb3f21edc7056cdf44a7f7bd7ba65af40741838c
  4. Affected versionversion=e800654e85b5b27966fc6493201f5f8cf658beb6 <c73f365707d3b1b78b7d16e1f029020d1ae50d0f
  5. Affected versionversion=e800654e85b5b27966fc6493201f5f8cf658beb6 <e19675b384e9dcaca1bd5e4a67b8ad136eccfbe8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2f59743be4d9568cad2d9cf697d1b897975421ed; version=6.13; version=e800654e85b5b27966fc6493201f5f8cf658beb6 <bb3f21edc7056cdf44a7f7bd7ba65af40741838c; version=e800654e85b5b27966fc6493201f5f8cf658beb6 <c73f365707d3b1b78b7d16e1f029020d1ae50d0f; version=e800654e85b5b27966fc6493201f5f8cf658beb6 <e19675b384e9dcaca1bd5e4a67b8ad136eccfbe8

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-617Reachable Assertion
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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