CVE-2025-22128

Summary

In the Linux kernel, the following vulnerability has been resolved:

wifi: ath12k: Clear affinity hint before calling ath12k_pci_free_irq() in error path

If a shared IRQ is used by the driver due to platform limitation, then the IRQ affinity hint is set right after the allocation of IRQ vectors in ath12k_pci_msi_alloc(). This does no harm unless one of the functions requesting the IRQ fails and attempt to free the IRQ.

This may end up with a warning from the IRQ core that is expecting the affinity hint to be cleared before freeing the IRQ:

kernel/irq/manage.c:

/* make sure affinity_hint is cleaned up */
if (WARN_ON_ONCE(desc->affinity_hint))
	desc->affinity_hint = NULL;

So to fix this issue, clear the IRQ affinity hint before calling ath12k_pci_free_irq() in the error path. The affinity will be cleared once again further down the error path due to code organization, but that does no harm.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a69a594794fcad96d4cfce12aab6c5014a12b4c8
• https://git.kernel.org/stable/c/35b33ba76765ce9e72949d957f3cf1feafd2955c
• https://git.kernel.org/stable/c/b43b1e2c52db77c872bd60d30cdcc72c47df70c7

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