CVE-2026-81015

/// Technical description

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

platform/x86/amd/pmc: Fix LPS0 and debugfs leaks when STB init fails

amd_pmc_probe() registers the LPS0 s2idle handler with

acpi_register_lps0_dev() and creates the driver's debugfs directory before

calling amd_stb_s2d_init(), which is the last step in probe that can fail.

When amd_stb_s2d_init() fails (for example the S2D telemetry region cannot

be ioremapped on a long-running system, or the SMU rejects the S2D setup)

the error path only calls pci_dev_put() and returns. This leaves

amd_pmc_s2idle_dev_ops on the global lps0_s2idle_devops_head list and leaks

the debugfs directory, while the devm-managed resources backing the handler

are torn down.

Reloading the module then walks the corrupted list in

acpi_register_lps0_dev() and hits:

list_add corruption. next->prev should be prev, but was NULL.

kernel BUG at lib/list_debug.c:29!

acpi_register_lps0_dev+0x44/0x80

amd_pmc_probe+0x224/0x380 [amd_pmc]

pla

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References