CVE-2026-43313

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-05-08. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 15, 2026

Advisory Details (7)

Auto-updated May 15, 2026
No patch confirmed yet.
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f132e089fe89cadc2098991f0a3cb05c3f824ac6
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b803811485ac0b2f774b6bf3abc8b999ba3b7033
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad86ac604f8391c0212a91412d4f764c7a85f254
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/29f60d3d06818d40118a30d663231f027ae87a05
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/06724a60cfa9767ea90b0f5d3dfb5cdd251b64f5
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0398b641be2b66c2fc7e0163c606ef19372e7ad5
generic

ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/01e8751b37a366b1ca561add0042f2ceb18c03bf

Vendor Advisories for CVE-2026-43313(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-08-23ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1106.110~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1117.102) @ jammy2026-08-23ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-08-23ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-08-23ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-08-23ubuntu
linuxKernel @ 5.15.202—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (113 versions)6.19.6-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(24)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 58× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 181 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-23 19:17 UTCEG score recompute
  11. 2026-08-23 19:17 UTCVendor advisory
  12. 2026-08-23 19:17 UTCGHSA enrichment
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 11:56 UTCEG score recompute
  20. 2026-08-17 11:56 UTCVendor advisory
  21. 2026-08-17 11:56 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 04:38 UTCEG score recompute
  24. 2026-08-16 04:38 UTCVendor advisory
  25. 2026-08-16 04:38 UTCGHSA enrichment
Show 75 more
  1. 2026-08-16 02:14 UTCEPSS rescore
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-15 00:50 UTCVendor advisory
  4. 2026-08-15 00:50 UTCGHSA enrichment
  5. 2026-08-14 03:12 UTCEG score recompute
  6. 2026-08-14 03:12 UTCVendor advisory
  7. 2026-08-14 03:12 UTCGHSA enrichment
  8. 2026-08-13 22:00 UTCEPSS rescore
  9. 2026-08-12 20:34 UTCEG score recompute
  10. 2026-08-12 20:34 UTCVendor advisory
  11. 2026-08-12 20:34 UTCGHSA enrichment
  12. 2026-08-12 13:51 UTCEPSS rescore
  13. 2026-08-11 22:58 UTCEG score recompute
  14. 2026-08-11 22:58 UTCVendor advisory
  15. 2026-08-11 22:58 UTCGHSA enrichment
  16. 2026-08-11 13:43 UTCEPSS rescore
  17. 2026-08-11 01:19 UTCEG score recompute
  18. 2026-08-11 01:19 UTCVendor advisory
  19. 2026-08-11 01:19 UTCGHSA enrichment
  20. 2026-08-11 00:00 UTCEPSS rescore
  21. 2026-08-10 00:02 UTCVendor advisory
  22. 2026-08-10 00:02 UTCGHSA enrichment
  23. 2026-08-09 02:26 UTCEG score recompute
  24. 2026-08-09 02:26 UTCVendor advisory
  25. 2026-08-09 02:26 UTCGHSA enrichment
  26. 2026-08-08 16:37 UTCEPSS rescore
  27. 2026-08-07 17:23 UTCEG score recompute
  28. 2026-08-07 17:23 UTCVendor advisory
  29. 2026-08-07 17:23 UTCGHSA enrichment
  30. 2026-08-06 19:46 UTCEG score recompute
  31. 2026-08-06 19:46 UTCVendor advisory
  32. 2026-08-06 19:46 UTCGHSA enrichment
  33. 2026-08-06 13:46 UTCEPSS rescore
  34. 2026-08-05 22:10 UTCEG score recompute
  35. 2026-08-05 22:10 UTCVendor advisory
  36. 2026-08-05 22:10 UTCGHSA enrichment
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-04 15:10 UTCEPSS rescore
  39. 2026-08-04 10:38 UTCEPSS rescore
  40. 2026-08-03 22:23 UTCEG score recompute
  41. 2026-08-03 22:23 UTCVendor advisory
  42. 2026-08-03 22:23 UTCGHSA enrichment
  43. 2026-08-03 10:36 UTCEPSS rescore
  44. 2026-08-03 00:47 UTCVendor advisory
  45. 2026-08-03 00:47 UTCGHSA enrichment
  46. 2026-08-02 03:10 UTCEG score recompute
  47. 2026-08-02 03:10 UTCVendor advisory
  48. 2026-08-02 03:10 UTCGHSA enrichment
  49. 2026-08-02 02:27 UTCEPSS rescore
  50. 2026-08-01 04:16 UTCEPSS rescore
  51. 2026-07-30 16:28 UTCEPSS rescore
  52. 2026-07-30 01:30 UTCEPSS rescore
  53. 2026-07-28 15:36 UTCEPSS rescore
  54. 2026-07-27 14:13 UTCEPSS rescore
  55. 2026-07-26 14:54 UTCEPSS rescore
  56. 2026-07-26 14:54 UTCEPSS rescore
  57. 2026-07-25 14:18 UTCEPSS rescore
  58. 2026-07-24 14:17 UTCEPSS rescore
  59. 2026-07-23 03:14 UTCEG score recompute
  60. 2026-07-22 14:08 UTCEPSS rescore
  61. 2026-07-21 15:24 UTCEPSS rescore
  62. 2026-07-20 17:08 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 02:29 UTCEPSS rescore
  65. 2026-07-16 17:03 UTCEPSS rescore
  66. 2026-07-16 05:49 UTCOSV refresh
  67. 2026-07-15 16:57 UTCEPSS rescore
  68. 2026-07-15 02:00 UTCEPSS rescore
  69. 2026-07-13 22:30 UTCEPSS rescore
  70. 2026-07-13 06:13 UTCEPSS rescore
  71. 2026-07-12 05:46 UTCEPSS rescore
  72. 2026-07-11 08:27 UTCEPSS rescore
  73. 2026-07-09 19:10 UTCEPSS rescore
  74. 2026-07-08 15:16 UTCEPSS rescore
  75. 2026-07-07 13:46 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-43313?
CVE-2026-43313 is a medium vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Fix NULL-pointer dereference in acpiprocessorerrata_piix4() In acpiprocessorerrata_piix4(), the pointer dev is first assigned an IDE device and then reassigned an ISA device: dev = pcigetsubsys(...,…
When was CVE-2026-43313 disclosed?
CVE-2026-43313 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43313 actively exploited?
CVE-2026-43313 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.7% of all scored CVEs.
What is the CVSS score of CVE-2026-43313?
CVE-2026-43313 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-43313?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43313, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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