CVE-2026-43313
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 ]
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Linux kernel Affected 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 2.6.12 | Affected | — |
| — | Affected | 5.15.202 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.85-1 |
| sid | Fixed | 6.19.6-1 |
| forky | Fixed | 6.19.6-1 |
| bullseye | Affected | — |
| bookworm | Fixed | 6.1.170-1 |
References
- https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf
- https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5
- https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
- https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05
- https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254
- https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033
- https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6
- https://www.suse.com/security/cve/CVE-2026-43313.html
- https://security-tracker.debian.org/tracker/CVE-2026-43313
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.