CVE-2026-64166

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 5.5 from GitHub Security Advisory published 2026-07-19. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration

The bus match callback assumes that every FF-A driver provides an id_table and dereferences it unconditionally. Enforce that contract at registration time so a buggy client driver cannot crash the bus during match.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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 (value × EchelonGraph’s weight)
Severity55% × 45%
The EG Score, 5.5 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 19, 2026

Last Modified

August 13, 2026

Advisory Details (7)

Auto-updated Aug 13, 2026
Patch available.
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f98f131256beaddd51ad468e95d90d857fef12bf
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc499d1acddbb75b5b4bce05f5296dd8ef9611fd
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/adfff93d08a2e12ecf2a1eba272d18bc749f13c0
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/820245d86ce58898fb48b4fefc77d0cafc02801d
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/34f59211984f66788390e7469f3e99d3796db4a8
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/198f6c86d508ed562f07dc00276cac6dbb5dd3bf
Web page

firmware: arm_ffa: Check for NULL FF-A ID table while driver registration - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0a5e695095c557d2380131b613dea4e8d90371be

Vendor Advisories for CVE-2026-64166(1)

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

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1075 (5.15.0-1075.79) @ jammy2026-10-04ubuntu
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-10-04ubuntu
ubuntulinux-tools-nvidia-lowlatency-5.15 (5.15.0.1107.107) @ jammy2026-10-04ubuntu
ubuntulinux-virtual-6.8 (6.8.0-139.139) @ noble2026-10-04ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.64) @ jammy2026-10-04ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-10-04ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1109.105) @ jammy2026-10-04ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-10-04ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1109.115~20.04.1) @ focal2026-10-04ubuntu
ubuntulinux-tools-intel-iot-realtime-5.15 (5.15.0.1104.108) @ jammy2026-10-04ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1112.122~20.04.1) @ focal2026-10-04ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16) @ resolute2026-10-04ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-10-04ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1106.104) @ jammy2026-10-04ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1067.75) @ noble2026-10-04ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2053.55) @ noble2026-10-04ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1067.75+fips1) @ noble2026-10-04ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1035.38) @ noble2026-10-04ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1036.37) @ noble2026-10-04ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1067.75~22.04.1) @ jammy2026-10-04ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1061.64) @ noble2026-10-04ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-139.139.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-azure-edge (7.0.0-1014.14~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1064.67+fips1) @ noble2026-10-04ubuntu
ubuntulinux-tools-oracle-edge (7.0.0-1011.11~24.04.1) @ noble2026-10-04ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1064.67) @ noble2026-10-04ubuntu
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1107.106) @ jammy2026-10-04ubuntu
ubuntulinux-tools-nvidia-tegra-rt-5.15 (5.15.0.1064.66~20.04.1) @ focal2026-10-04ubuntu
ubuntulinux-tools-azure-fde-lts-22.04 (5.15.0.1117.126) @ jammy2026-10-04ubuntu

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)
  • every version up to 6.1.176-1: fixed in 6.1.176-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.94-1~bpo12+1 (27 versions)
  • every version up to 6.12.94-1: fixed in 6.12.94-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (142 versions)
  • every version up to 7.0.12-1: fixed in 7.0.12-1
—

Weakness Classification(1)

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

All Vendor Advisories

(25)

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 11× in last 7d / 45× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 182 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 82 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-12 15:48 UTCEG score recompute
  4. 2026-10-11 19:32 UTCEG score recompute
  5. 2026-10-11 16:48 UTCEG score recompute
  6. 2026-10-11 14:09 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  15. 2026-10-04 15:00 UTCEG score recompute
  16. 2026-10-04 15:00 UTCVendor advisory
  17. 2026-10-04 15:00 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  21. 2026-10-01 07:57 UTCEG score recompute
  22. 2026-10-01 07:57 UTCVendor advisory
  23. 2026-10-01 07:57 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 4th percentile
Show 75 more
  1. 2026-09-28 06:32 UTCEG score recompute
  2. 2026-09-28 06:32 UTCVendor advisory
  3. 2026-09-28 06:31 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  4. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  5. 2026-09-24 03:32 UTCEG score recompute
  6. 2026-09-24 03:32 UTCVendor advisory
  7. 2026-09-24 03:32 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  8. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-09-23 01:49 UTCEG score recompute
  10. 2026-09-23 01:49 UTCVendor advisory
  11. 2026-09-23 01:48 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-09-18 04:07 UTCEG score recompute
  15. 2026-09-18 04:07 UTCVendor advisory
  16. 2026-09-18 04:07 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  17. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-09-16 12:52 UTCEG score recompute
  19. 2026-09-16 12:52 UTCVendor advisory
  20. 2026-09-16 12:51 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  21. 2026-09-13 22:53 UTCEG score recompute
  22. 2026-09-13 22:53 UTCVendor advisory
  23. 2026-09-13 22:52 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  24. 2026-09-12 19:31 UTCVendor advisory
  25. 2026-09-12 19:31 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  26. 2026-09-11 18:37 UTCEG score recompute
  27. 2026-09-11 18:37 UTCVendor advisory
  28. 2026-09-11 18:37 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  30. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  31. 2026-09-09 12:35 UTCEG score recompute
  32. 2026-09-09 12:35 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  34. 2026-09-07 23:04 UTCEG score recompute
  35. 2026-09-07 23:04 UTCVendor advisory
  36. 2026-09-07 23:03 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  38. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  39. 2026-09-06 12:00 UTCVendor advisory
  40. 2026-09-06 11:59 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  41. 2026-09-05 09:46 UTCEG score recompute
  42. 2026-09-05 09:46 UTCVendor advisory
  43. 2026-09-05 09:46 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  44. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  48. 2026-08-31 03:17 UTCEG score recompute
  49. 2026-08-31 03:17 UTCVendor advisory
  50. 2026-08-31 03:17 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-08-30 02:44 UTCEG score recompute
  53. 2026-08-30 02:44 UTCVendor advisory
  54. 2026-08-30 02:44 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  55. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  56. 2026-08-28 02:27 UTCEG score recompute
  57. 2026-08-28 02:27 UTCVendor advisory
  58. 2026-08-28 02:27 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  59. 2026-08-27 02:00 UTCEG score recompute
  60. 2026-08-27 02:00 UTCVendor advisory
  61. 2026-08-27 02:00 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  62. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-08-26 01:34 UTCEG score recompute
  64. 2026-08-26 01:34 UTCVendor advisory
  65. 2026-08-26 01:33 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  66. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-08-25 01:08 UTCEG score recompute
  68. 2026-08-25 01:08 UTCVendor advisory
  69. 2026-08-25 01:07 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  70. 2026-08-24 00:41 UTCVendor advisory
  71. 2026-08-24 00:41 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  72. 2026-08-23 00:14 UTCEG score recompute
  73. 2026-08-23 00:14 UTCVendor advisory
  74. 2026-08-23 00:14 UTCGHSA enrichmentGHSA-hfhw-j953-vcq4 · GitHub CVSS 5.5
  75. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile

Frequently asked(5)

What is CVE-2026-64166?
CVE-2026-64166 is a medium-severity vulnerability; its CVE record was published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Check for NULL FF-A ID table while driver registration The bus match callback assumes that every FF-A driver provides an id_table and dereferences it unconditionally. Enforce that contract at registration time so…
When was the CVE record for CVE-2026-64166 published?
The CVE record for CVE-2026-64166 was published on July 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 13, 2026; the record at its source may have been updated since.
Is CVE-2026-64166 actively exploited?
CVE-2026-64166 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-64166?
CVE-2026-64166 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64166?
A fix for CVE-2026-64166 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-64166 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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