CVE-2026-43313ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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 ]
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < ad86ac604f8391c0212a91412d4f764c7a85f254
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 01e8751b37a366b1ca561add0042f2ceb18c03bf
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b803811485ac0b2f774b6bf3abc8b999ba3b7033
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 29f60d3d06818d40118a30d663231f027ae87a05
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 0398b641be2b66c2fc7e0163c606ef19372e7ad5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f132e089fe89cadc2098991f0a3cb05c3f824ac6
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.16 – ≤ 6.18.*
- unaffected 6.19.6 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References7
- https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5 (opens in a new tab)
- https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254 (opens in a new tab)
- https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf (opens in a new tab)
- https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033 (opens in a new tab)
- https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05 (opens in a new tab)
- https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5 (opens in a new tab)
- https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28583 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43313)Record last updated .