CVE-2021-47194

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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 \u2192 nl80211_set_interface \u2192 cfg80211_change_iface), not by processing over-the-air WiFi frames or remote network packets.\nAC:L - An attacker fully controls the sequence\u2014set the interface to P2P_GO, start AP (assigning the chanctx), then SET_INTERFACE to ADHOC\u2014and 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", 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "8f06bb8c216bcd172394f61e557727e691b4cb24", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "0738cdb636c21ab552eaecf905efa4a6070e3ebc", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "4e458abbb4a523f1413bfe15c079cf4e24c15b21", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "b8a045e2a9b234cfbc06cf36923886164358ddec", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "52affc201fc22a1ab9a59ef0ed641a9adfcb8d13", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "7b97b5776daa0b39dbdadfea176f9cc0646d4a66", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd", "versionType": "git"}, {"status": "affected", "version": "ac800140c20e7ae51117e71289065bedd4930fc2", "lessThan": "563fbefed46ae4c1f70cffb8eb54c02df480b2c2", "versionType": "git"}], "programFiles": ["net/wireless/util.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.6"}, {"status": "unaffected", "version": "0", "lessThan": "3.6", "versionType": "semver"}, {"status": "unaffected", "version": "4.4.293", "versionType": "semver", "lessThanOrEqual": "4.4.*"}, {"status": "unaffected", "version": "4.9.291", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.256", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.218", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.162", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.82", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.5", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/wireless/util.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8f06bb8c216bcd172394f61e557727e691b4cb24"}, {"url": "https://git.kernel.org/stable/c/0738cdb636c21ab552eaecf905efa4a6070e3ebc"}, {"url": "https://git.kernel.org/stable/c/4e458abbb4a523f1413bfe15c079cf4e24c15b21"}, {"url": "https://git.kernel.org/stable/c/b8a045e2a9b234cfbc06cf36923886164358ddec"}, {"url": "https://git.kernel.org/stable/c/52affc201fc22a1ab9a59ef0ed641a9adfcb8d13"}, {"url": "https://git.kernel.org/stable/c/7b97b5776daa0b39dbdadfea176f9cc0646d4a66"}, {"url": "https://git.kernel.org/stable/c/5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd"}, {"url": "https://git.kernel.org/stable/c/563fbefed46ae4c1f70cffb8eb54c02df480b2c2"}], "x_generator": {"engine": "bippy-1.2.0"}, "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. 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{"bugzilla": {"description": "kernel: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type", "id": "2274615", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2274615"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncfg80211: call cfg80211_stop_ap when switch from P2P_GO type\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.", "A flaw was found in the Linux Kernel, where in-use data initialization in net/wireless/util.c can lead to corrupted data."], "name": "CVE-2021-47194", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47194\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47194\nhttps://lore.kernel.org/linux-cve-announce/2024041035-CVE-2021-47194-51cd@gregkh/T"], "statement": "Red Hat Enterprise Linux 9 is not affected by this vulnerability.", "threat_severity": "Moderate"}

{}