CVE-2025-23155 (GCVE-0-2025-23155)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2025-09-29 10:52
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8deec94c6040bb4a767f6e9456a0a44c7f2e713e
Version: 8deec94c6040bb4a767f6e9456a0a44c7f2e713e
Version: 8deec94c6040bb4a767f6e9456a0a44c7f2e713e
Version: 8deec94c6040bb4a767f6e9456a0a44c7f2e713e
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/stmicro/stmmac/stmmac_main.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: Fix accessing freed irq affinity_hint\n\nIn stmmac_request_irq_multi_msi(), a pointer to the stack variable\ncpu_mask is passed to irq_set_affinity_hint(). This value is stored in\nirq_desc-\u003eaffinity_hint, but once stmmac_request_irq_multi_msi()\nreturns, the pointer becomes dangling.\n\nThe affinity_hint is exposed via procfs with S_IRUGO permissions,\nallowing any unprivileged process to read it. Accessing this stale\npointer can lead to:\n\n- a kernel oops or panic if the referenced memory has been released and\n  unmapped, or\n- leakage of kernel data into userspace if the memory is re-used for\n  other purposes.\n\nAll platforms that use stmmac with PCI MSI (Intel, Loongson, etc) are\naffected."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-29T10:52:52.697Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "net: stmmac: Fix accessing freed irq affinity_hint",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-23155",
    "datePublished": "2025-05-01T12:55:41.607Z",
    "dateReserved": "2025-01-11T14:28:41.514Z",
    "dateUpdated": "2025-09-29T10:52:52.697Z",
    "state": "PUBLISHED"
  },
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  }
}


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