CVE-2026-43200

Local kernel crash via reversed unlink parameters

Published May 6, 2026 · Updated May 6, 2026

Improper callback argument handling in affected Linux Kernel releases allows local users to crash the kernel through configfs. The pci_primary_epc_epf_unlink() and pci_secondary_epc_epf_unlink() callbacks reverse the required source and target parameters, so unlinking passes the wrong object into pci_epf_unbind(). Exploitation requires local low-privileged access and an unlink operation against a configured PCI endpoint link; the resulting invalid dereference causes a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper callback argument handling in affected Linux Kernel releases allows local users to crash the kernel through configfs. The pci_primary_epc_epf_unlink() and pci_secondary_epc_epf_unlink() callbacks reverse the required source and target parameters, so unlinking passes the wrong object into pci_epf_unbind(). Exploitation requires local low-privileged access and an unlink operation against a configured PCI endpoint link; the resulting invalid dereference causes a kernel crash.

The record

CVE
CVE-2026-43200
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.12
  2. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <142b1bba3299264b76ed8ef53cd93b2b2af65d6c
  3. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <1c96c1acef4b4a1108fc13f84a8ac0b0633bbb46
  4. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <339191811e6fc4559c4008c5af7a91b05086d596
  5. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <58686bf62cb38b92e4b28408162a5703775b4d12
  6. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <733cbc3aa97e71cc70847e75c925b364cc9b04a6
  7. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <8754dd7639ab0fd68c3ab9d91c7bdecc3e5740a8
  8. Affected versionversion=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <aefc0e0bd20f54abe3b501b8798c0be656af272b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.12; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <142b1bba3299264b76ed8ef53cd93b2b2af65d6c; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <1c96c1acef4b4a1108fc13f84a8ac0b0633bbb46; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <339191811e6fc4559c4008c5af7a91b05086d596; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <58686bf62cb38b92e4b28408162a5703775b4d12; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <733cbc3aa97e71cc70847e75c925b364cc9b04a6; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <8754dd7639ab0fd68c3ab9d91c7bdecc3e5740a8; version=e85a2d7837622bd99c96f5bbc7f972da90c285a2 <aefc0e0bd20f54abe3b501b8798c0be656af272b

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo