Medium 5.5Published May 8, 2026

CVE-2026-43313ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()

Updated under an hour ago (Oct 26, 2026, 2:50 PM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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 ]

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ad86ac604f8391c0212a91412d4f764c7a85f254; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 01e8751b37a366b1ca561add0042f2ceb18c03bf; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b803811485ac0b2f774b6bf3abc8b999ba3b7033; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 29f60d3d06818d40118a30d663231f027ae87a05; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0398b641be2b66c2fc7e0163c606ef19372e7ad5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f132e089fe89cadc2098991f0a3cb05c3f824ac6	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6; 2.6.12; 2.6.12; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5	patch
https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254	patch
https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf	patch
https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033	patch
https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05	patch
https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5	patch
https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.