{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52864","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T15:19:24.261Z","datePublished":"2024-05-21T15:31:55.875Z","dateUpdated":"2026-08-05T09:11:43.009Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T09:11:43.009Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: wmi: Fix opening of char device\n\nSince commit fa1f68db6ca7 (\"drivers: misc: pass miscdevice pointer via\nfile private data\"), the miscdevice stores a pointer to itself inside\nfilp->private_data, which means that private_data will not be NULL when\nwmi_char_open() is called. This might cause memory corruption should\nwmi_char_open() be unable to find its driver, something which can\nhappen when the associated WMI device is deleted in wmi_free_devices().\n\nFix the problem by using the miscdevice pointer to retrieve the WMI\ndevice data associated with a char device using container_of(). This\nalso avoids wmi_char_open() picking a wrong WMI device bound to a\ndriver with the same name as the original driver."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached by opening the local misc char device `/dev/wmi/$driver` (typically `/dev/wmi/dell-smbios`): open → misc_open → wmi_char_open. There is no network or adjacent-link path into this platform/x86 WMI code.\nAC:H - Memory corruption requires wmi_char_open() to fail its driver lookup while misc_open still succeeds, which the fix ties to wmi_free_devices() list_del before misc_deregister—i.e. concurrent ACPI/platform WMI removal (e.g. rmmod wmi). An unprivileged attacker can spam open/ioctl but cannot induce that privileged teardown, matching other module-unload races scored AC:H.\nPR:L - The char device is registered with mode 0444, so any local unprivileged user can open it and issue read/ioctl; no init-namespace root or capability is required on the attacker’s side of the race.\nUI:N - The attacker opens and operates on the WMI char device in their own process; no victim action is required. Concurrent administrative device removal is Attack Complexity, not User Interaction.\nS:U - Type confusion / use-after-free stays inside the host kernel’s WMI/misc authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Failed lookup leaves filp->private_data as a miscdevice* that read/ioctl treat as struct wmi_block, causing out-of-bounds reads of adjacent heap; if the wblock is freed while the fd is held this becomes a UAF disclosure primitive, scored High per kernel guidance.\nI:H - The same type confusion/UAF makes wmi_ioctl() mutex_lock, dereference handler_data, and copy_from_user() through misinterpreted pointers—yielding heap corruption and an arbitrary-write primitive after reclaim, so Integrity is High.\nA:H - Misinterpreting a miscdevice as a wmi_block (or using a freed wblock) reliably leads to invalid memory access, oops/panic, or hang on corrupted locks; any such kernel crash/UAF is Availability High."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/platform/x86/wmi.c"],"versions":[{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"cf098e937dd125c0317a0d6f261ac2a950a233d6","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"9fb0eed09e1470cd4021ff52b2b9dfcbcee4c203","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"d426a2955e45a95b2282764105fcfb110a540453","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"e0bf076b734a2fab92d8fddc2b8b03462eee7097","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"44a96796d25809502c75771d40ee693c2e44724e","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"36d85fa7ae0d6be651c1a745191fa7ef055db43e","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"fb7b06b59c6887659c6ed0ecd3110835eecbb6a3","status":"affected","versionType":"git"},{"version":"44b6b7661132b1b0e5fd3147ded66f1e4a817ca9","lessThan":"eba9ac7abab91c8f6d351460239108bef5e7a0b6","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/wmi.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"4.19.299","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.261","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.201","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.139","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.63","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.5.12","lessThanOrEqual":"6.5.*","status":"unaffected","versionType":"semver"},{"version":"6.6.2","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7","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":"4.15","versionEndExcluding":"4.19.299"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.4.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.10.201"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.139"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.1.63"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.5.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.6.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.7"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cf098e937dd125c0317a0d6f261ac2a950a233d6"},{"url":"https://git.kernel.org/stable/c/9fb0eed09e1470cd4021ff52b2b9dfcbcee4c203"},{"url":"https://git.kernel.org/stable/c/d426a2955e45a95b2282764105fcfb110a540453"},{"url":"https://git.kernel.org/stable/c/e0bf076b734a2fab92d8fddc2b8b03462eee7097"},{"url":"https://git.kernel.org/stable/c/44a96796d25809502c75771d40ee693c2e44724e"},{"url":"https://git.kernel.org/stable/c/36d85fa7ae0d6be651c1a745191fa7ef055db43e"},{"url":"https://git.kernel.org/stable/c/fb7b06b59c6887659c6ed0ecd3110835eecbb6a3"},{"url":"https://git.kernel.org/stable/c/eba9ac7abab91c8f6d351460239108bef5e7a0b6"}],"title":"platform/x86: 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