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CVE-2026-81015 (GCVE-0-2026-81015)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-13 06:29
VLAI
Title
platform/x86/amd/pmc: Fix LPS0 and debugfs leaks when STB init fails
Summary
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] platform_probe+0x67/0x90 Even without a reload, the stale registration means the next s2idle transition calls into torn-down driver state. Unwind the debugfs directory and the LPS0 registration on the amd_stb_s2d_init() error path. acpi_unregister_lps0_dev() is safe to call unconditionally here: it is guarded on the same conditions as acpi_register_lps0_dev(), which is exactly what amd_pmc_remove() already relies on.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8 , < bc9aa5fe21c3966c80647ed6574b94b863f23c62 (git)
Affected: 83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8 , < 30e5f4d0cd0be655c800f10ae3e530391aa6c1b5 (git)
Affected: 83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8 , < 76f650a76d6a36a4bee79d94db90a0e935a95477 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd/pmc: Fix LPS0 and debugfs leaks when STB init fails\n\namd_pmc_probe() registers the LPS0 s2idle handler with\nacpi_register_lps0_dev() and creates the driver\u0027s debugfs directory before\ncalling amd_stb_s2d_init(), which is the last step in probe that can fail.\n\nWhen amd_stb_s2d_init() fails (for example the S2D telemetry region cannot\nbe ioremapped on a long-running system, or the SMU rejects the S2D setup)\nthe error path only calls pci_dev_put() and returns.  This leaves\namd_pmc_s2idle_dev_ops on the global lps0_s2idle_devops_head list and leaks\nthe debugfs directory, while the devm-managed resources backing the handler\nare torn down.\n\nReloading the module then walks the corrupted list in\nacpi_register_lps0_dev() and hits:\n\n  list_add corruption. next-\u003eprev should be prev, but was NULL.\n  kernel BUG at lib/list_debug.c:29!\n   acpi_register_lps0_dev+0x44/0x80\n   amd_pmc_probe+0x224/0x380 [amd_pmc]\n   platform_probe+0x67/0x90\n\nEven without a reload, the stale registration means the next s2idle\ntransition calls into torn-down driver state.\n\nUnwind the debugfs directory and the LPS0 registration on the\namd_stb_s2d_init() error path.  acpi_unregister_lps0_dev() is safe to call\nunconditionally here: it is guarded on the same conditions as\nacpi_register_lps0_dev(), which is exactly what amd_pmc_remove() already\nrelies on."
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              "value": "AV:L - The flaw is in amd_pmc_probe() and the ACPI LPS0 s2idle callbacks on local AMD Ryzen platforms; there is no network, Bluetooth, or remote packet path into this platform driver.\nAC:L - Once amd_stb_s2d_init() fails, the leaked LPS0 registration is deterministic; suspend then invokes the dangling handler, and a later bind or module reload list_add()s onto the already-linked or freed lps0_s2idle_devops_head node with no race the attacker must win.\nPR:L - After the probe error path leaves amd_pmc_s2idle_dev_ops on the global LPS0 list, an unprivileged local-session user on AMD laptops can trigger s2idle via logind, idle-timeout, or lid-close without init-namespace root; user namespaces cannot reach this driver.\nUI:N - Exploitation needs no separate victim action such as mounting a filesystem or opening a device; the attacker requests suspend themselves, or automatic s2idle and driver reload/bind exercise the stale list unattended.\nS:U - The dangling LPS0 list node, use of torn-down ioremap/mutex state, and kernel list corruption remain in the host kernel; this is standard kernel memory corruption, not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - The stale acpi_s2idle_dev_ops stays on lps0_s2idle_devops_head after devm ioremap is torn down and after rmmod the ops object itself is freed; s2idle and list_add then read recycled vmalloc/module memory, a use-after-free disclosure primitive.\nI:H - Module reload list_add() writes through dangling next/prev pointers, and s2idle handlers issue MMIO writes and call prepare/check/restore through torn-down or freed module state, enabling control-flow hijack per kernel UAF guidance.\nA:H - Reloading amd_pmc hits list_add corruption and kernel BUG in acpi_register_lps0_dev(), and the next s2idle transition oopses or hangs while walking the corrupted list or invoking the torn-down LPS0 handler."
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    "dateReserved": "2026-08-26T14:34:25.813Z",
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      "cve": "CVE-2026-81015",
      "id": "CVE-2026-81015",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/x86/amd/pmc: Fix LPS0 and debugfs leaks when STB init fails",
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      "id": "CVE-2026-81015",
      "initial_release_date": "2026-09-12T16:35:28Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-81015",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-81015.json",
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    }
  }
}



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