CVE-2026-64070
Estado: AnalizadaMedia (5.5)—
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():
(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:
Leer descripción completaMostrar menos
Add an out_success label that calls put_cpu_var() before returning the byte count, mirroring affinity_domain_via_partition_show().
Detalles técnicos trazas, registros y código del informe original
processor_bus_topology_show() processor_config_show() affinity_domain_via_virtual_processor_show() affinity_domain_via_domain_show() 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
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-Other
Referencias
- https://git.kernel.org/stable/c/45afabe7f99c5d8746434ee41c86584c01d70147
- https://git.kernel.org/stable/c/903409000a07ac8e31ffedeb8516f4f8d67150c8
- https://git.kernel.org/stable/c/b300312562fd6e4729697adb9f777f00ca0429f3
- https://git.kernel.org/stable/c/b61ebb2826ca1852c2bbd92a676fb622c358cab4
- https://git.kernel.org/stable/c/dbc30a57bd8e026995e9fa8e8c31cffd18542c01
JSON original (NVD)
Mostrar
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"integrityImpact": "NONE",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/hv-gpci: fix preempt count leak in sysfs show paths\n\nFour sysfs show() callbacks in hv-gpci take get_cpu_var(hv_gpci_reqb)\n(which calls preempt_disable()) but only call the matching put_cpu_var()\non the error path under the 'out:' label. Every successful read leaks\none preempt_disable():\n\n processor_bus_topology_show()\n processor_config_show()\n affinity_domain_via_virtual_processor_show()\n affinity_domain_via_domain_show()\n\n(affinity_domain_via_partition_show() was already correct.)\n\nOn a CONFIG_PREEMPT=y kernel, repeated reads raise preempt_count and\neventually return to userspace with preemption still disabled. The\nnext user-mode page fault then hits faulthandler_disabled() == 1,\ngets forced to SIGSEGV, and the resulting coredump trips\n'BUG: scheduling while atomic' in call_usermodehelper_exec ->\nwait_for_completion_state -> schedule:\n\n BUG: scheduling while atomic: <task>/<pid>/0x00000004\n ...\n __schedule_bug+0x6c/0x90\n __schedule+0x58c/0x13a0\n schedule+0x48/0x1a0\n schedule_timeout+0x104/0x170\n wait_for_completion_state+0x16c/0x330\n call_usermodehelper_exec+0x254/0x2d0\n vfs_coredump+0x1050/0x2590\n get_signal+0xb9c/0xc80\n do_notify_resume+0xf8/0x470\n\nAdd an out_success label that calls put_cpu_var() before returning\nthe byte count, mirroring affinity_domain_via_partition_show()."
}
],
"lastModified": "2026-09-03T15:11:27.580",
"configurations": [
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