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NVD / CVE Program· CNA Linux

CVE-2026-64070: powerpc/hv-gpci: fix preempt count leak in sysfs show paths

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 45afabe7f99c5d8746434ee41c86584c01d70147, 903409000a07ac8e31ffedeb8516f4f8d67150c8, b300312562fd6e4729697adb9f777f00ca0429f3.

Low priority for now. Upgrade to Linux Linux 45afabe7f99c5d8746434ee41c86584c01d70147, 903409000a07ac8e31ffedeb8516f4f8d67150c8, b300312562fd6e4729697adb9f777f00ca0429f3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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: <task>/<pid>/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().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Sep 3, 2026
EPSS
0.1% · 1th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6 and later · before 6.6.156
  • linux linux kernel6.7 and later · before 6.12.108
  • linux linux kernel6.13 and later · before 6.18.49
  • linux linux kernel6.19 and later · before 7.0.11
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.6affected
    • 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 and later · before b300312562fd6e4729697adb9f777f00ca0429f3affected · git
    • 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 and later · before 45afabe7f99c5d8746434ee41c86584c01d70147affected · git
    • 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 and later · before b61ebb2826ca1852c2bbd92a676fb622c358cab4affected · git
    • 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 and later · before 903409000a07ac8e31ffedeb8516f4f8d67150c8affected · git
    • 71f1c39647d8c9d4d54a861ec81f1ff17544bcb6 and later · before dbc30a57bd8e026995e9fa8e8c31cffd18542c01affected · git
    • before 6.6not affected · semver
    • 6.6.156 and later · up to and including 6.6.*not affected · semver
    • 6.12.108 and later · up to and including 6.12.*not affected · semver
    • 6.18.49 and later · up to and including 6.18.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.0.12-17.0.12-1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_23before 1-150700.15.3.21-150700.15.3.2
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7-RT_Update_22before 1-150700.1.3.11-150700.1.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.87.3.150700.17.49.26.4.0-150700.53.87.3.150700.17.49.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-docsbefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-obs-buildbefore 6.4.0-150700.53.87.26.4.0-150700.53.87.2
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-symsbefore 6.4.0-150700.53.87.16.4.0-150700.53.87.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7kernel-azurebefore 6.4.0-150700.53.87.36.4.0-150700.53.87.3
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-159998.54.1.159998.21.406.4.0-159998.54.1.159998.21.40
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.1kernel-default-basebefore 6.4.0-159998.54.1.159998.21.396.4.0-159998.54.1.159998.21.39
SUSE:Real Time Module 15 SP7kernel-rtbefore 6.4.0-150700.7.81.16.4.0-150700.7.81.1
SUSE:Real Time Module 15 SP7kernel-source-rtbefore 6.4.0-150700.7.81.16.4.0-150700.7.81.1
SUSE:Real Time Module 15 SP7kernel-syms-rtbefore 6.4.0-150700.7.81.16.4.0-150700.7.81.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64066Jul 19, 2026 · netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
    39Monitor
  • ← EarlierCVE-2026-64069Jul 19, 2026 · netfs: Fix cancellation of a DIO and single read subrequests
    39Monitor
  • Later →CVE-2026-64071Jul 19, 2026 · nvme-pci: fix use-after-free in nvme_free_host_mem()
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux45afabe7f99c5d8746434ee41c86584c01d70147Vendor (CNA)
Linux Linux903409000a07ac8e31ffedeb8516f4f8d67150c8Vendor (CNA)
Linux Linuxb300312562fd6e4729697adb9f777f00ca0429f3Vendor (CNA)
Linux Linuxb61ebb2826ca1852c2bbd92a676fb622c358cab4Vendor (CNA)
Linux Linuxdbc30a57bd8e026995e9fa8e8c31cffd18542c01Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
suse:kernel-64kb6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-azure6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Public Cloud 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-159998.54.1.159998.21.40 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-kvmsmall6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_231-150700.15.3.2 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_221-150700.1.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.4.0-150700.53.87.2 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-source6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-syms6.4.0-150700.53.87.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150700.53.87.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records