CVE-2026-43227
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
clocksource/drivers/sh_tmu: Always leave device running after probe
The TMU device can be used as both a clocksource and a clockevent provider. The driver tries to be smart and power itself on and off, as well as enabling and disabling its clock when it's not in operation. This behavior is slightly altered if the TMU is used as an early platform device in which case the device is left powered on after probe, but the clock is still enabled and disabled at runtime.
This has worked for a long time, but recent improvements in PREEMPT_RT and PROVE_LOCKING have highlighted an issue.
Leer descripción completaMostrar menos
As the TMU registers itself as a clockevent provider, clockevents_register_device(), it needs to use raw spinlocks internally as this is the context of which the clockevent framework interacts with the TMU driver. However in the context of holding a raw spinlock the TMU driver can't really manage its power state or clock with calls to pm_runtime_*() and clk_*() as these calls end up in other platform drivers using regular spinlocks to control power and clocks.
This mix of spinlock contexts trips a lockdep warning.
For non-PREEMPT_RT builds this is not really an issue, but for PREEMPT_RT builds where normal spinlocks can sleep this might be an issue. Be cautious and always leave the power and clock running after probe.
Detalles técnicos trazas, registros y código del informe original
=============================
[ BUG: Invalid wait context ]
6.18.0-arm64-renesas-09926-gee959e7c5e34 #1 Not tainted
-----------------------------
swapper/0/0 is trying to lock:
ffff000008c9e180 (&dev->power.lock){-...}-{3:3}, at: __pm_runtime_resume+0x38/0x88
other info that might help us debug this:
context-{5:5}
1 lock held by swapper/0/0:
ccree e6601000.crypto: ARM CryptoCell 630P Driver: HW version 0xAF400001/0xDCC63000, Driver version 5.0
#0: ffff8000817ec298
ccree e6601000.crypto: ARM ccree device initialized
(tick_broadcast_lock){-...}-{2:2}, at: __tick_broadcast_oneshot_control+0xa4/0x3a8
stack backtrace:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.18.0-arm64-renesas-09926-gee959e7c5e34 #1 PREEMPT
Hardware name: Renesas Salvator-X 2nd version board based on r8a77965 (DT)
Call trace:
show_stack+0x14/0x1c (C)
dump_stack_lvl+0x6c/0x90
dump_stack+0x14/0x1c
__lock_acquire+0x904/0x1584
lock_acquire+0x220/0x34c
_raw_spin_lock_irqsave+0x58/0x80
__pm_runtime_resume+0x38/0x88
sh_tmu_clock_event_set_oneshot+0x84/0xd4
clockevents_switch_state+0xfc/0x13c
tick_broadcast_set_event+0x30/0xa4
__tick_broadcast_oneshot_control+0x1e0/0x3a8
tick_broadcast_oneshot_control+0x30/0x40
cpuidle_enter_state+0x40c/0x680
cpuidle_enter+0x30/0x40
do_idle+0x1f4/0x280
cpu_startup_entry+0x34/0x40
kernel_init+0x0/0x130
do_one_initcall+0x0/0x230
__primary_switched+0x88/0x90CVSS
- 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: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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-noinfo
Referencias
- https://git.kernel.org/stable/c/016476afef993d1201a19decc9b5b2ea1e6620f2
- https://git.kernel.org/stable/c/0e513cc6b9cea190fe342cc222b1054e7e8acfc8
- https://git.kernel.org/stable/c/6f113ab549b864c1bc57d4f89846ee335394089a
- https://git.kernel.org/stable/c/79d650695773f03de36b99228a090d33d1c18264
- https://git.kernel.org/stable/c/88c76792180dffd83f1c5b9dc8fdaeb145cb94e0
- https://git.kernel.org/stable/c/b1278972b08e480990e2789bdc6a7c918bc349be
- https://git.kernel.org/stable/c/bc59d5f3afe41fec5d673c27c703b761ae578d28
- https://git.kernel.org/stable/c/f0b31247e7d67a943b3a09d3cef7c0ae788d88e6
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource/drivers/sh_tmu: Always leave device running after probe\n\nThe TMU device can be used as both a clocksource and a clockevent\nprovider. The driver tries to be smart and power itself on and off, as\nwell as enabling and disabling its clock when it's not in operation.\nThis behavior is slightly altered if the TMU is used as an early\nplatform device in which case the device is left powered on after probe,\nbut the clock is still enabled and disabled at runtime.\n\nThis has worked for a long time, but recent improvements in PREEMPT_RT\nand PROVE_LOCKING have highlighted an issue. As the TMU registers itself\nas a clockevent provider, clockevents_register_device(), it needs to use\nraw spinlocks internally as this is the context of which the clockevent\nframework interacts with the TMU driver. However in the context of\nholding a raw spinlock the TMU driver can't really manage its power\nstate or clock with calls to pm_runtime_*() and clk_*() as these calls\nend up in other platform drivers using regular spinlocks to control\npower and clocks.\n\nThis mix of spinlock contexts trips a lockdep warning.\n\n =============================\n [ BUG: Invalid wait context ]\n 6.18.0-arm64-renesas-09926-gee959e7c5e34 #1 Not tainted\n -----------------------------\n swapper/0/0 is trying to lock:\n ffff000008c9e180 (&dev->power.lock){-...}-{3:3}, at: __pm_runtime_resume+0x38/0x88\n other info that might help us debug this:\n context-{5:5}\n 1 lock held by swapper/0/0:\n ccree e6601000.crypto: ARM CryptoCell 630P Driver: HW version 0xAF400001/0xDCC63000, Driver version 5.0\n #0: ffff8000817ec298\n ccree e6601000.crypto: ARM ccree device initialized\n (tick_broadcast_lock){-...}-{2:2}, at: __tick_broadcast_oneshot_control+0xa4/0x3a8\n stack backtrace:\n CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.18.0-arm64-renesas-09926-gee959e7c5e34 #1 PREEMPT\n Hardware name: Renesas Salvator-X 2nd version board based on r8a77965 (DT)\n Call trace:\n show_stack+0x14/0x1c (C)\n dump_stack_lvl+0x6c/0x90\n dump_stack+0x14/0x1c\n __lock_acquire+0x904/0x1584\n lock_acquire+0x220/0x34c\n _raw_spin_lock_irqsave+0x58/0x80\n __pm_runtime_resume+0x38/0x88\n sh_tmu_clock_event_set_oneshot+0x84/0xd4\n clockevents_switch_state+0xfc/0x13c\n tick_broadcast_set_event+0x30/0xa4\n __tick_broadcast_oneshot_control+0x1e0/0x3a8\n tick_broadcast_oneshot_control+0x30/0x40\n cpuidle_enter_state+0x40c/0x680\n cpuidle_enter+0x30/0x40\n do_idle+0x1f4/0x280\n cpu_startup_entry+0x34/0x40\n kernel_init+0x0/0x130\n do_one_initcall+0x0/0x230\n __primary_switched+0x88/0x90\n\nFor non-PREEMPT_RT builds this is not really an issue, but for\nPREEMPT_RT builds where normal spinlocks can sleep this might be an\nissue. Be cautious and always leave the power and clock running after\nprobe."
}
],
"lastModified": "2026-06-17T10:49:11.570",
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