{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-81015", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.813Z", "datePublished": "2026-09-11T19:43:04.063Z", "dateUpdated": "2026-10-19T08:46:40.596Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:40.596Z" }, "descriptions": [ { "lang": "en", "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's 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->prev 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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/x86/amd/pmc/pmc.c" ], "versions": [ { "version": "49de59f69a76f538bfa5d0638a8c98d052546567", "lessThan": "d201c09c2428a4a8fd3bdcb032ae99f1e016458c", "status": "affected", "versionType": "git" }, { "version": "83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8", "lessThan": "bc9aa5fe21c3966c80647ed6574b94b863f23c62", "status": "affected", "versionType": "git" }, { "version": "83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8", "lessThan": "30e5f4d0cd0be655c800f10ae3e530391aa6c1b5", "status": "affected", "versionType": "git" }, { "version": "83ad6974dd3bf34c080b3c08d36d02ebc3bd6da8", "lessThan": "76f650a76d6a36a4bee79d94db90a0e935a95477", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/platform/x86/amd/pmc/pmc.c" ], "versions": [ { "version": "6.14", "status": "affected" }, { "version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d201c09c2428a4a8fd3bdcb032ae99f1e016458c" }, { "url": "https://git.kernel.org/stable/c/bc9aa5fe21c3966c80647ed6574b94b863f23c62" }, { "url": "https://git.kernel.org/stable/c/30e5f4d0cd0be655c800f10ae3e530391aa6c1b5" }, { "url": "https://git.kernel.org/stable/c/76f650a76d6a36a4bee79d94db90a0e935a95477" } ], "title": "platform/x86/amd/pmc: Fix LPS0 and debugfs leaks when STB init fails", "x_generator": { "engine": "bippy-1.2.0" } } } }