{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47194", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-25T09:12:14.114Z", "datePublished": "2024-04-10T18:56:31.361Z", "dateUpdated": "2026-08-05T08:46:38.073Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:38.073Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncfg80211: call cfg80211_stop_ap when switch from P2P_GO type\n\nIf the userspace tools switch from NL80211_IFTYPE_P2P_GO to\nNL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it\ndoes not call the cleanup cfg80211_stop_ap(), this leads to the\ninitialization of in-use data. For example, this path re-init the\nsdata->assigned_chanctx_list while it is still an element of\nassigned_vifs list, and makes that linked list corrupt." } ], "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 vulnerability is triggered exclusively via local nl80211 Generic Netlink (NL80211_CMD_SET_INTERFACE → nl80211_set_interface → cfg80211_change_iface), not by processing over-the-air WiFi frames or remote network packets.\nAC:L - An attacker fully controls the sequence—set the interface to P2P_GO, start AP (assigning the chanctx), then SET_INTERFACE to ADHOC—and reliably causes INIT_LIST_HEAD on an still-linked assigned_chanctx_list with no attacker-independent race or external timing.\nPR:L - NL80211_CMD_SET_INTERFACE uses GENL_UNS_ADMIN_PERM, requiring only CAP_NET_ADMIN in the socket netns user namespace; with mac80211_hwsim (also GENL_UNS_ADMIN_PERM) or a wiphy in that netns this is reachable via unshare -Urn, so privileges score Low per CNA guidance.\nUI:N - The attacker issues the netlink commands themselves to change the interface type; no separate victim action such as mounting a filesystem or approving a prompt is required.\nS:U - Impact stays within the host kernel wireless/mac80211 authority (local list corruption / privilege-escalation class) and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - INIT_LIST_HEAD on an in-use assigned_chanctx_list corrupts the chanctx assigned_vifs list, and subsequent walks dereference poisoned/reused pointers; this list-corruption class enables heap reuse and arbitrary kernel memory disclosure primitives.\nI:H - Corrupted list_head unlink/walk paths over attacker-influenced heap state yield classic arbitrary-write and control-flow hijack primitives, matching High integrity impact for kernel list corruption.\nA:H - Syzbot reproduces a general protection fault in ieee80211_chanctx_num_assigned when walking the corrupted assigned_vifs list, causing a kernel oops/panic and full denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/wireless/util.c" ], "versions": [ { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "8f06bb8c216bcd172394f61e557727e691b4cb24", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "0738cdb636c21ab552eaecf905efa4a6070e3ebc", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "4e458abbb4a523f1413bfe15c079cf4e24c15b21", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "b8a045e2a9b234cfbc06cf36923886164358ddec", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "52affc201fc22a1ab9a59ef0ed641a9adfcb8d13", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "7b97b5776daa0b39dbdadfea176f9cc0646d4a66", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd", "status": "affected", "versionType": "git" }, { "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "563fbefed46ae4c1f70cffb8eb54c02df480b2c2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/wireless/util.c" ], "versions": [ { "version": "3.6", "status": "affected" }, { "version": "0", "lessThan": "3.6", "status": "unaffected", "versionType": "semver" }, { "version": "4.4.293", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.291", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.256", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.218", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.162", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.82", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": 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