CVE-2026-64070

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

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, ghsa, nvd
Trending — 4 sources updated this week
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:

powerpc/hv-gpci: fix preempt count leak in sysfs show paths

Four sysfs show() callbacks in hv-gpci take get_cpu_var(hv_gpci_reqb) (which calls preempt_disable()) but only call the matching put_cpu_var() on the error path under the 'out:' label. Every successful read leaks one preempt_disable():

processor_bus_topology_show() processor_config_show() affinity_domain_via_virtual_processor_show() affinity_domain_via_domain_show()

(affinity_domain_via_partition_show() was already correct.)

On a CONFIG_PREEMPT=y kernel, repeated reads raise preempt_count and eventually return to userspace with preemption still disabled. The next user-mode page fault then hits faulthandler_disabled() == 1, gets forced to SIGSEGV, and the resulting coredump trips 'BUG: scheduling while atomic' in call_usermodehelper_exec -> wait_for_completion_state -> schedule:

BUG: scheduling while atomic: //0x00000004 ... __schedule_bug+0x6c/0x90 __schedule+0x58c/0x13a0 schedule+0x48/0x1a0 schedule_timeout+0x104/0x170 wait_for_completion_state+0x16c/0x330 call_usermodehelper_exec+0x254/0x2d0 vfs_coredump+0x1050/0x2590 get_signal+0xb9c/0xc80 do_notify_resume+0xf8/0x470

Add an out_success label that calls put_cpu_var() before returning the byte count, mirroring affinity_domain_via_partition_show().

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

July 19, 2026

Last Modified

September 3, 2026

Advisory Details (5)

Auto-updated Sep 3, 2026
No patch confirmed yet.
generic

powerpc/hv-gpci: fix preempt count leak in sysfs show paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dbc30a57bd8e026995e9fa8e8c31cffd18542c01
generic

powerpc/hv-gpci: fix preempt count leak in sysfs show paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b61ebb2826ca1852c2bbd92a676fb622c358cab4
generic

powerpc/hv-gpci: fix preempt count leak in sysfs show paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b300312562fd6e4729697adb9f777f00ca0429f3
generic

powerpc/hv-gpci: fix preempt count leak in sysfs show paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/903409000a07ac8e31ffedeb8516f4f8d67150c8
generic

powerpc/hv-gpci: fix preempt count leak in sysfs show paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/45afabe7f99c5d8746434ee41c86584c01d70147

Vendor Advisories for CVE-2026-64070(2)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oracle-7.0 (7.0.0-1008.8) @ resolute2026-09-11ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-09-11ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1015.15) @ resolute2026-09-11ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1016.16~24.04.1) @ noble2026-09-11ubuntu
ubuntulinux-tools-nvidia-hwe-26.04 (7.0.0-2016.16) @ resolute2026-09-11ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-11ubuntu

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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (176 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.0.9-1~bpo13+1 (141 versions)7.0.12-1—

All Vendor Advisories

(6)

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 18× in last 7d / 53× 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 103 total refreshes for this CVE.

  1. 2026-09-11 18:45 UTCEG score recompute
  2. 2026-09-11 18:45 UTCVendor advisory
  3. 2026-09-11 18:45 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 23:16 UTCEG score recompute
  8. 2026-09-07 23:16 UTCVendor advisory
  9. 2026-09-07 23:16 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-06 12:50 UTCEG score recompute
  13. 2026-09-06 12:50 UTCVendor advisory
  14. 2026-09-06 12:50 UTCGHSA enrichment
  15. 2026-09-05 15:31 UTCEPSS rescore
  16. 2026-09-05 09:54 UTCEG score recompute
  17. 2026-09-05 09:54 UTCVendor advisory
  18. 2026-09-05 09:54 UTCGHSA enrichment
  19. 2026-09-04 05:07 UTCEPSS rescore
  20. 2026-09-03 15:17 UTCEG score recompute▲ 5.50
  21. 2026-09-03 15:17 UTCGHSA enrichment
  22. 2026-09-03 15:14 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  23. 2026-09-02 14:12 UTCEPSS rescore
  24. 2026-09-02 13:36 UTCGHSA enrichment
  25. 2026-09-02 13:24 UTCNVD update
Show 75 more
  1. 2026-09-02 12:56 UTCGHSA enrichment
  2. 2026-09-02 12:53 UTCMITRE cvelistV5
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 02:50 UTCVendor advisory
  7. 2026-08-30 02:50 UTCGHSA enrichment
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-28 21:42 UTCEPSS rescore
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-25 22:44 UTCVendor advisory
  12. 2026-08-25 22:44 UTCGHSA enrichment
  13. 2026-08-25 13:49 UTCEPSS rescore
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-22 15:13 UTCVendor advisory
  16. 2026-08-22 15:13 UTCGHSA enrichment
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-20 22:55 UTCEPSS rescore
  19. 2026-08-19 17:04 UTCEPSS rescore
  20. 2026-08-19 08:23 UTCVendor advisory
  21. 2026-08-19 08:23 UTCGHSA enrichment
  22. 2026-08-18 13:48 UTCEPSS rescore
  23. 2026-08-17 13:47 UTCEPSS rescore
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 01:34 UTCVendor advisory
  26. 2026-08-16 01:34 UTCGHSA enrichment
  27. 2026-08-15 01:30 UTCEPSS rescore
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-12 18:44 UTCVendor advisory
  30. 2026-08-12 18:44 UTCGHSA enrichment
  31. 2026-08-12 13:51 UTCEPSS rescore
  32. 2026-08-11 00:00 UTCEPSS rescore
  33. 2026-08-09 13:47 UTCEPSS rescore
  34. 2026-08-09 11:55 UTCVendor advisory
  35. 2026-08-09 11:55 UTCGHSA enrichment
  36. 2026-08-08 16:37 UTCEPSS rescore
  37. 2026-08-06 13:47 UTCEPSS rescore
  38. 2026-08-06 05:05 UTCVendor advisory
  39. 2026-08-06 05:05 UTCGHSA enrichment
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-05 19:17 UTCEPSS rescore
  42. 2026-08-04 15:10 UTCEPSS rescore
  43. 2026-08-04 10:39 UTCEPSS rescore
  44. 2026-08-03 10:36 UTCEPSS rescore
  45. 2026-08-02 22:16 UTCVendor advisory
  46. 2026-08-02 22:16 UTCGHSA enrichment
  47. 2026-08-02 02:27 UTCEPSS rescore
  48. 2026-08-01 04:16 UTCEPSS rescore
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-30 15:26 UTCEG score recompute
  51. 2026-07-30 15:26 UTCGHSA enrichment
  52. 2026-07-30 01:30 UTCEPSS rescore
  53. 2026-07-30 01:30 UTCEPSS rescore
  54. 2026-07-29 17:44 UTCGHSA enrichment
  55. 2026-07-28 15:37 UTCEPSS rescore
  56. 2026-07-27 14:14 UTCEPSS rescore
  57. 2026-07-26 14:54 UTCEPSS rescore
  58. 2026-07-26 14:54 UTCEPSS rescore
  59. 2026-07-26 10:54 UTCEG score recompute
  60. 2026-07-26 10:54 UTCVendor advisory
  61. 2026-07-26 10:54 UTCGHSA enrichment
  62. 2026-07-25 14:18 UTCEPSS rescore
  63. 2026-07-25 14:18 UTCEPSS rescore
  64. 2026-07-24 14:18 UTCEPSS rescore
  65. 2026-07-24 14:18 UTCEPSS rescore
  66. 2026-07-23 14:18 UTCEPSS rescore
  67. 2026-07-23 14:18 UTCEPSS rescore
  68. 2026-07-23 03:22 UTCEG score recompute
  69. 2026-07-22 14:08 UTCEPSS rescore
  70. 2026-07-22 14:08 UTCEPSS rescore
  71. 2026-07-21 15:25 UTCEPSS rescore
  72. 2026-07-21 15:25 UTCEPSS rescore
  73. 2026-07-20 17:25 UTCEG score recompute
  74. 2026-07-20 17:25 UTCGHSA enrichment
  75. 2026-07-20 17:08 UTCEPSS rescore

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-64070?
CVE-2026-64070 is a medium vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: powerpc/hv-gpci: fix preempt count leak in sysfs show paths Four sysfs show() callbacks in hv-gpci take getcpuvar(hvgpcireqb) (which calls preemptdisable()) but only call the matching putcpu_var() on the error path under the 'out:'…
When was CVE-2026-64070 disclosed?
CVE-2026-64070 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64070 actively exploited?
CVE-2026-64070 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 97.8% of all scored CVEs.
What is the CVSS score of CVE-2026-64070?
CVE-2026-64070 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64070?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64070, 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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