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.
Metrics
Affected Vendors & Products
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Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Mon, 29 Sep 2025 11:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: net: stmmac: Fix accessing freed irq affinity_hint The cpumask should not be a local variable, since its pointer is saved to irq_desc and may be accessed from procfs. To fix it, use the persistent mask cpumask_of(cpu#). | 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. |
Wed, 16 Jul 2025 13:45:00 +0000
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| Metrics |
epss
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epss
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Sun, 06 Jul 2025 09:30:00 +0000
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Fri, 02 May 2025 14:45:00 +0000
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| Metrics |
threat_severity
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cvssV3_1
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Thu, 01 May 2025 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: net: stmmac: Fix accessing freed irq affinity_hint The cpumask should not be a local variable, since its pointer is saved to irq_desc and may be accessed from procfs. To fix it, use the persistent mask cpumask_of(cpu#). | |
| Title | net: stmmac: Fix accessing freed irq affinity_hint | |
| References |
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2025-09-29T10:52:52.697Z
Reserved: 2025-01-11T14:28:41.514Z
Link: CVE-2025-23155
Vulnrichment
No data.
NVD
Status : Awaiting Analysis
Published: 2025-05-01T13:15:51.413
Modified: 2025-09-29T11:15:47.327
Link: CVE-2025-23155
Redhat
OpenCVE Enrichment
No data.