CVE-2021-47201

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An attacker can reoccupy the freed object; subsequent NAPI list walks read attacker-controlled state (as in the related iavf NAPI UAF CVE-2023-53556), enabling high confidentiality impact.\nI:H - Later napi_del/list walks perform list_del_rcu and related writes on the freed napi_struct, yielding arbitrary-write primitives via forged next/prev pointers, sufficient for control-flow hijacking under kernel UAF guidance.\nA:H - The commit documents a kernel panic when the interface is brought back up after PF communication is restored; any walk of the corrupted napi_list (reinit, free_netdev, etc.) can oops/panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/intel/iavf/iavf_main.c"], "versions": [{"version": "65c7006f234c9ede887d468f595f259a5c5cc552", "lessThan": "926e8c83d4c1c2dac0026637eb0d492df876489e", "status": "affected", "versionType": "git"}, {"version": "65c7006f234c9ede887d468f595f259a5c5cc552", "lessThan": "78638b47132244e3934dc5dc79f6372d5ce8e98c", "status": "affected", "versionType": "git"}, {"version": "65c7006f234c9ede887d468f595f259a5c5cc552", "lessThan": "9ef6589cac9a8c47f5544ccdf4c498093733bb3f", "status": "affected", "versionType": "git"}, {"version": "65c7006f234c9ede887d468f595f259a5c5cc552", "lessThan": "89f22f129696ab53cfbc608e0a2184d0fea46ac1", "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/net/ethernet/intel/iavf/iavf_main.c"], "versions": [{"version": "4.13", "status": "affected"}, {"version": "0", "lessThan": "4.13", "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": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "5.4.162"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "5.10.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "5.15.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/926e8c83d4c1c2dac0026637eb0d492df876489e"}, {"url": "https://git.kernel.org/stable/c/78638b47132244e3934dc5dc79f6372d5ce8e98c"}, {"url": "https://git.kernel.org/stable/c/9ef6589cac9a8c47f5544ccdf4c498093733bb3f"}, {"url": "https://git.kernel.org/stable/c/89f22f129696ab53cfbc608e0a2184d0fea46ac1"}], "title": "iavf: free q_vectors before queues in iavf_disable_vf", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47201", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-10T19:51:02.253151Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:14:25.949Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.396Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/926e8c83d4c1c2dac0026637eb0d492df876489e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/78638b47132244e3934dc5dc79f6372d5ce8e98c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9ef6589cac9a8c47f5544ccdf4c498093733bb3f", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/89f22f129696ab53cfbc608e0a2184d0fea46ac1", "tags": ["x_transferred"]}]}]}}

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This resolves a panic encountered when the\ninterface is disabled and then later brought up again after PF\ncommunication is restored."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iavf: libera q_vectors antes de las colas en iavf_disable_vf iavf_free_queues() borra adaptador->num_active_queues, del que depende iavf_free_q_vectors(), por lo que se debe intercambiar el orden de estas dos llamadas de funci\u00f3n en iavf_disable_vf(). Esto resuelve un p\u00e1nico que se produce cuando se deshabilita la interfaz y luego se vuelve a activar despu\u00e9s de que se restablece la comunicaci\u00f3n PF."}], "id": "CVE-2021-47201", "lastModified": "2026-08-04T10:16:52.383", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47201", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-10T19:51:02.253151Z", "version": "2.0.3"}}]}, "published": "2024-04-10T19:15:48.123", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78638b47132244e3934dc5dc79f6372d5ce8e98c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89f22f129696ab53cfbc608e0a2184d0fea46ac1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/926e8c83d4c1c2dac0026637eb0d492df876489e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ef6589cac9a8c47f5544ccdf4c498093733bb3f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/78638b47132244e3934dc5dc79f6372d5ce8e98c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89f22f129696ab53cfbc608e0a2184d0fea46ac1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/926e8c83d4c1c2dac0026637eb0d492df876489e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9ef6589cac9a8c47f5544ccdf4c498093733bb3f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iavf: free q_vectors before queues in iavf_disable_vf", "id": "2274608", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2274608"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\niavf: free q_vectors before queues in iavf_disable_vf\niavf_free_queues() clears adapter->num_active_queues, which\niavf_free_q_vectors() relies on, so swap the order of these two function\ncalls in iavf_disable_vf(). This resolves a panic encountered when the\ninterface is disabled and then later brought up again after PF\ncommunication is restored."], "name": "CVE-2021-47201", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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-2021-47201\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47201\nhttps://lore.kernel.org/linux-cve-announce/2024041037-CVE-2021-47201-d7c8@gregkh/T"], "threat_severity": "Low"}

{}