In the Linux kernel, the following vulnerability has been resolved:
pinctrl: ocelot: fix system hang on level based interrupts
The current implementation only calls chained_irq_enter() and
chained_irq_exit() if it detects pending interrupts.
```
for (i = 0; i < info->stride; i++) {
uregmap_read(info->map, id_reg + 4 * i, ®);
if (!reg)
continue;
chained_irq_enter(parent_chip, desc);
```
However, in case of GPIO pin configured in level mode and the parent
controller configured in edge mode, GPIO interrupt might be lowered by the
hardware. In the result, if the interrupt is short enough, the parent
interrupt is still pending while the GPIO interrupt is cleared;
chained_irq_enter() never gets called and the system hangs trying to
service the parent interrupt.
Moving chained_irq_enter() and chained_irq_exit() outside the for loop
ensures that they are called even when GPIO interrupt is lowered by the
hardware.
The similar code with chained_irq_enter() / chained_irq_exit() functions
wrapping interrupt checking loop may be found in many other drivers:
```
grep -r -A 10 chained_irq_enter drivers/pinctrl
```
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Linux |
|
Configuration 1 [-]
|
No data.
References
History
Mon, 03 Nov 2025 23:30:00 +0000
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Wed, 01 Oct 2025 21:15:00 +0000
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ssvc
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Fri, 29 Nov 2024 20:45:00 +0000
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| First Time appeared |
Linux
Linux linux Kernel |
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| Weaknesses | CWE-754 | |
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:* |
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| Vendors & Products |
Linux
Linux linux Kernel |
Fri, 22 Nov 2024 14:00:00 +0000
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| Metrics |
threat_severity
|
cvssV3_1
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Fri, 08 Nov 2024 06:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: pinctrl: ocelot: fix system hang on level based interrupts The current implementation only calls chained_irq_enter() and chained_irq_exit() if it detects pending interrupts. ``` for (i = 0; i < info->stride; i++) { uregmap_read(info->map, id_reg + 4 * i, ®); if (!reg) continue; chained_irq_enter(parent_chip, desc); ``` However, in case of GPIO pin configured in level mode and the parent controller configured in edge mode, GPIO interrupt might be lowered by the hardware. In the result, if the interrupt is short enough, the parent interrupt is still pending while the GPIO interrupt is cleared; chained_irq_enter() never gets called and the system hangs trying to service the parent interrupt. Moving chained_irq_enter() and chained_irq_exit() outside the for loop ensures that they are called even when GPIO interrupt is lowered by the hardware. The similar code with chained_irq_enter() / chained_irq_exit() functions wrapping interrupt checking loop may be found in many other drivers: ``` grep -r -A 10 chained_irq_enter drivers/pinctrl ``` | |
| Title | pinctrl: ocelot: fix system hang on level based interrupts | |
| References |
|
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-11-08T05:54:10.949Z
Updated: 2025-11-03T22:26:51.994Z
Reserved: 2024-10-21T19:36:19.968Z
Link: CVE-2024-50196
Vulnrichment
Updated: 2025-10-01T15:21:30.876Z
NVD
Status : Modified
Published: 2024-11-08T06:15:16.347
Modified: 2025-11-03T23:17:01.100
Link: CVE-2024-50196
Redhat