CVE-2025-23155

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < 2fbf67ddb8a0d0efc00d2df496a9843ec318d48baffected
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < 960dab23f6d405740c537d095f90a4ee9ddd9285affected
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < 442312c2a90d60c7a5197246583fa91d9e579985affected
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < e148266e104fce396ad624079a6812ac3a9982efaffected
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < 9e51a6a44e2c4de780a26e8fe110d708e806a8cdaffected
LinuxLinux8deec94c6040bb4a767f6e9456a0a44c7f2e713e < c60d101a226f18e9a8f01bb4c6ca2b47dfcb15efaffected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux6.1.164 <= 6.1.*unaffected
LinuxLinux6.6.117 <= 6.6.*unaffected
LinuxLinux6.12.36 <= 6.12.*unaffected
LinuxLinux6.13.12 <= 6.13.*unaffected
LinuxLinux6.14.3 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

References