CVE-2026-43313

Local kernel crash via overwritten PCI pointer

Published May 8, 2026 · Updated May 8, 2026

NULL-pointer dereference in the Linux Kernel ACPI processor subsystem allows local users to crash the kernel through a failed PCI lookup. In acpi_processor_errata_piix4(), a successful IDE lookup is overwritten by a failed ISA lookup, leaving dev NULL before dev_dbg() dereferences it. Reachability requires low-privileged local access and an Intel PIIX4 state in which the IDE lookup succeeds, the ISA lookup fails, and BMISX is set.

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

NULL-pointer dereference in the Linux Kernel ACPI processor subsystem allows local users to crash the kernel through a failed PCI lookup. In acpi_processor_errata_piix4(), a successful IDE lookup is overwritten by a failed ISA lookup, leaving dev NULL before dev_dbg() dereferences it. Reachability requires low-privileged local access and an Intel PIIX4 state in which the IDE lookup succeeds, the ISA lookup fails, and BMISX is set.

The record

CVE
CVE-2026-43313
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01e8751b37a366b1ca561add0042f2ceb18c03bf
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0398b641be2b66c2fc7e0163c606ef19372e7ad5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29f60d3d06818d40118a30d663231f027ae87a05
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ad86ac604f8391c0212a91412d4f764c7a85f254
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b803811485ac0b2f774b6bf3abc8b999ba3b7033
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f132e089fe89cadc2098991f0a3cb05c3f824ac6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01e8751b37a366b1ca561add0042f2ceb18c03bf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0398b641be2b66c2fc7e0163c606ef19372e7ad5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29f60d3d06818d40118a30d663231f027ae87a05; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ad86ac604f8391c0212a91412d4f764c7a85f254; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b803811485ac0b2f774b6bf3abc8b999ba3b7033; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f132e089fe89cadc2098991f0a3cb05c3f824ac6

Published CVSS scores

5.5NVDCVSS: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

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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-476NULL Pointer Dereference
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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