medium
5.5
CWE
754
Advisory Published
Updated

CVE-2024-50196: pinctrl: ocelot: fix system hang on level based interrupts

First published: Fri Nov 08 2024(Updated: )

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, &reg); 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 ```

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel<5.15.169
Linux Kernel>=5.16<6.1.114
Linux Kernel>=6.2<6.6.58
Linux Kernel>=6.7<6.11.5
Linux Kernel=6.12-rc1
Linux Kernel=6.12-rc2
Linux Kernel=6.12-rc3
debian/linux<=5.10.223-1<=5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1
debian/linux-6.1
6.1.119-1~deb11u1

Remedy

https://git.kernel.org/stable/c/20728e86289ab463b99b7ab4425515bd26aba417

Remedy

https://git.kernel.org/stable/c/4a81800ef05bea5a9896f199677f7b7f5020776a

Remedy

https://git.kernel.org/stable/c/655f5d4662b958122b260be05aa6dfdf8768efe6

Remedy

https://git.kernel.org/stable/c/93b8ddc54507a227087c60a0013ed833b6ae7d3c

Remedy

https://git.kernel.org/stable/c/dcbe9954634807ec54e22bde278b5b269f921381

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-50196?

    CVE-2024-50196 has been assigned a critical severity level due to its potential to cause system hang during interrupt handling in the Linux kernel.

  • How do I fix CVE-2024-50196?

    To fix CVE-2024-50196, users should update their Linux kernel to the latest version that includes the fix for this vulnerability.

  • Which Linux kernel versions are affected by CVE-2024-50196?

    CVE-2024-50196 affects Linux kernel versions from 5.15.169 up to, but not including, 6.1.114 and several specific versions up to 6.12-rc3.

  • What type of vulnerability is CVE-2024-50196?

    CVE-2024-50196 is a kernel vulnerability specifically related to the handling of level-based interrupts in the Linux kernel.

  • Is there a known exploit for CVE-2024-50196?

    As of now, there is no widely known exploit for CVE-2024-50196, but users are advised to apply the fix to prevent potential exploits.

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