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Medium severity5.5NVD Advisory· Published May 1, 2025· Updated Jun 17, 2026

CVE-2025-23155

CVE-2025-23155

Description

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

net: stmmac: Fix accessing freed irq affinity_hint

In stmmac_request_irq_multi_msi(), a pointer to the stack variable cpu_mask is passed to irq_set_affinity_hint(). This value is stored in irq_desc->affinity_hint, but once stmmac_request_irq_multi_msi() returns, the pointer becomes dangling.

The affinity_hint is exposed via procfs with S_IRUGO permissions, allowing any unprivileged process to read it. Accessing this stale pointer can lead to:

- a kernel oops or panic if the referenced memory has been released and unmapped, or - leakage of kernel data into userspace if the memory is re-used for other purposes.

All platforms that use stmmac with PCI MSI (Intel, Loongson, etc) are affected.

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Affected products

120

Patches

Vulnerability mechanics

References

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