CVE-2026-43313 (GCVE-0-2026-43313)
Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-05-08 13:11
VLAI?
Title
ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()
In acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE
device and then reassigned an ISA device:
dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);
dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);
If the first lookup succeeds but the second fails, dev becomes NULL. This
leads to a potential null-pointer dereference when dev_dbg() is called:
if (errata.piix4.bmisx)
dev_dbg(&dev->dev, ...);
To prevent this, use two temporary pointers and retrieve each device
independently, avoiding overwriting dev with a possible NULL value.
[ rjw: Subject adjustment, added an empty code line ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ad86ac604f8391c0212a91412d4f764c7a85f254 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 01e8751b37a366b1ca561add0042f2ceb18c03bf (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b803811485ac0b2f774b6bf3abc8b999ba3b7033 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 29f60d3d06818d40118a30d663231f027ae87a05 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0398b641be2b66c2fc7e0163c606ef19372e7ad5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f132e089fe89cadc2098991f0a3cb05c3f824ac6 (git) |
||
{
"containers": {
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/acpi/acpi_processor.c"
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"versionType": "git"
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"status": "affected",
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"versionType": "git"
}
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},
{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.202",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.165",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.202",
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{
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}
],
"negate": false,
"operator": "OR"
}
]
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],
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()\n\nIn acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE\ndevice and then reassigned an ISA device:\n\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);\n\nIf the first lookup succeeds but the second fails, dev becomes NULL. This\nleads to a potential null-pointer dereference when dev_dbg() is called:\n\n if (errata.piix4.bmisx)\n dev_dbg(\u0026dev-\u003edev, ...);\n\nTo prevent this, use two temporary pointers and retrieve each device\nindependently, avoiding overwriting dev with a possible NULL value.\n\n[ rjw: Subject adjustment, added an empty code line ]"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T13:11:30.386Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5"
},
{
"url": "https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254"
},
{
"url": "https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf"
},
{
"url": "https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033"
},
{
"url": "https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05"
},
{
"url": "https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5"
},
{
"url": "https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6"
}
],
"title": "ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-43313",
"datePublished": "2026-05-08T13:11:30.386Z",
"dateReserved": "2026-05-01T14:12:56.001Z",
"dateUpdated": "2026-05-08T13:11:30.386Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43313\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T14:16:39.710\",\"lastModified\":\"2026-05-08T14:16:39.710\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()\\n\\nIn acpi_processor_errata_piix4(), the pointer dev is first assigned an IDE\\ndevice and then reassigned an ISA device:\\n\\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB, ...);\\n dev = pci_get_subsys(..., PCI_DEVICE_ID_INTEL_82371AB_0, ...);\\n\\nIf the first lookup succeeds but the second fails, dev becomes NULL. This\\nleads to a potential null-pointer dereference when dev_dbg() is called:\\n\\n if (errata.piix4.bmisx)\\n dev_dbg(\u0026dev-\u003edev, ...);\\n\\nTo prevent this, use two temporary pointers and retrieve each device\\nindependently, avoiding overwriting dev with a possible NULL value.\\n\\n[ rjw: Subject adjustment, added an empty code line ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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