CVE-2026-97946

Summary

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

x86/amd_node: Fix PCI device reference counting in amd_smn_init()

The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete.

Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope.

Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting.

Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < 84e3a71d11d8593c127b468d75b2653af5074f81affected
LinuxLinux0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < aa2a4277ad42fd8f918c6dc652473946a253f7b0affected
LinuxLinux0a4b61d9c2e496b5f0a10e29e355a1465c8738bb < 27600805e62f800bacf990354632eae4e487d34caffected
LinuxLinuxc4ad899a33198ab6335732c769835d035e66894aaffected
LinuxLinux6.17.8 < 6.18affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References