CVE-2021-47517

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This patch targets the netlink part as the ioctl one\nisn't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't be found after unregister.\n\n[1] For example adding Tx queues after unregister ends up in NULL\n pointer exceptions and UaFs, such as:\n\n BUG: KASAN: use-after-free in kobject_get+0x14/0x90\n Read of size 1 at addr ffff88801961248c by task ethtool/755\n\n CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\n Call Trace:\n dump_stack_lvl+0x57/0x72\n print_address_description.constprop.0+0x1f/0x140\n kasan_report.cold+0x7f/0x11b\n kobject_get+0x14/0x90\n kobject_add_internal+0x3d1/0x450\n kobject_init_and_add+0xba/0xf0\n netdev_queue_update_kobjects+0xcf/0x200\n netif_set_real_num_tx_queues+0xb4/0x310\n veth_set_channels+0x1c3/0x550\n ethnl_set_channels+0x524/0x610"}], "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 bug is triggered via the ethtool Generic Netlink interface (AF_NETLINK / ETHTOOL_MSG_*_SET), a local syscall path; the ioctl path is unaffected and there is no remote packet-processing entry.\nAC:L - An attacker who can create and delete a netdev (e.g. veth) and issue ethtool CHANNELS_SET controls both sides of the race: hold a ref via ethnl_parse_header_dev_get, unregister under rtnl (tearing down queue kobjects), then set channels after rtnl is free\u2014winning the window is attacker-driven and retryable.\nPR:L - CHANNELS_SET (and other SET ops that call ethnl_ops_begin) require GENL_UNS_ADMIN_PERM, i.e. CAP_NET_ADMIN in the network namespace\u2019s user_ns; with netnsok and unshare -Urn this is available to an unprivileged userns user, not real init-ns root.\nUI:N - The attacker creates the device, races unregister with ethtool SET, and triggers the UAF themselves; no separate victim action is required.\nS:U - Impact is kernel heap UAF / oops within the same host OS authority (ethtool/netdevice sysfs kobjects); this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - The fix documents a KASAN use-after-free in kobject_get when adding Tx queues after unregister; per guidance a UAF yields a high confidentiality impact via heap reuse/read primitives.\nI:H - The same UAF on unregistered queues_kset/queue kobjects enables heap spray and corruption of adjacent objects, supporting write and control-flow hijacking primitives.\nA:H - The report shows KASAN UAF and NULL pointer exceptions from operating on unregistering devices, which can oops/panic the kernel and fully impact availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ethtool/netlink.c"], "versions": [{"version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", "lessThan": "7c26da3be1e9843a15b5318f90db8a564479d2ac", "status": "affected", "versionType": "git"}, {"version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", "lessThan": "cfd719f04267108f5f5bf802b9d7de69e99a99f9", "status": "affected", "versionType": "git"}, {"version": "041b1c5d4a53e97fc9e029ae32469552ca12cb9b", "lessThan": "dde91ccfa25fd58f64c397d91b81a4b393100ffa", "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/ethtool/netlink.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.87", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.8", "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": "5.6", "versionEndExcluding": "5.10.87"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac"}, {"url": "https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9"}, {"url": "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa"}], "title": "ethtool: do not perform operations on net devices being unregistered", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47517", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-24T19:18:28.551288Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:57.373Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.610Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa", "tags": ["x_transferred"]}]}]}}

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In that time frame ethtool operations\ncould still be performed, which might end up in unwanted or undefined\nbehaviours[1].\n\nDo not allow ethtool operations after a net device starts its\nunregistration. This patch targets the netlink part as the ioctl one\nisn't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't be found after unregister.\n\n[1] For example adding Tx queues after unregister ends up in NULL\n pointer exceptions and UaFs, such as:\n\n BUG: KASAN: use-after-free in kobject_get+0x14/0x90\n Read of size 1 at addr ffff88801961248c by task ethtool/755\n\n CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\n Call Trace:\n dump_stack_lvl+0x57/0x72\n print_address_description.constprop.0+0x1f/0x140\n kasan_report.cold+0x7f/0x11b\n kobject_get+0x14/0x90\n kobject_add_internal+0x3d1/0x450\n kobject_init_and_add+0xba/0xf0\n netdev_queue_update_kobjects+0xcf/0x200\n netif_set_real_num_tx_queues+0xb4/0x310\n veth_set_channels+0x1c3/0x550\n ethnl_set_channels+0x524/0x610"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.87", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.8", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:13.450Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47517", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:48:13.450Z", "dateReserved": "2024-05-24T15:02:54.824Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-24T15:09:30.675Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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In that time frame ethtool operations\ncould still be performed, which might end up in unwanted or undefined\nbehaviours[1].\n\nDo not allow ethtool operations after a net device starts its\nunregistration. This patch targets the netlink part as the ioctl one\nisn't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't be found after unregister.\n\n[1] For example adding Tx queues after unregister ends up in NULL\n pointer exceptions and UaFs, such as:\n\n BUG: KASAN: use-after-free in kobject_get+0x14/0x90\n Read of size 1 at addr ffff88801961248c by task ethtool/755\n\n CPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\n Call Trace:\n dump_stack_lvl+0x57/0x72\n print_address_description.constprop.0+0x1f/0x140\n kasan_report.cold+0x7f/0x11b\n kobject_get+0x14/0x90\n kobject_add_internal+0x3d1/0x450\n kobject_init_and_add+0xba/0xf0\n netdev_queue_update_kobjects+0xcf/0x200\n netif_set_real_num_tx_queues+0xb4/0x310\n veth_set_channels+0x1c3/0x550\n ethnl_set_channels+0x524/0x610"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ethtool: no realiza operaciones en dispositivos de red que se est\u00e1n dando de baja. Hay un breve per\u00edodo entre que un dispositivo de red comienza a darse de baja y cuando realmente desaparece. En ese per\u00edodo a\u00fan se podr\u00edan realizar operaciones de ethtool, lo que podr\u00eda terminar en comportamientos no deseados o indefinidos[1]. No permita operaciones de ethtool despu\u00e9s de que un dispositivo de red inicie su cancelaci\u00f3n del registro. Este parche apunta a la parte netlink ya que la parte ioctl no se ve afectada: se toma la referencia al dispositivo de red y la operaci\u00f3n se ejecuta dentro de una secci\u00f3n de bloqueo rtnl y el dispositivo de red no se encontrar\u00e1 despu\u00e9s de cancelar el registro. [1] Por ejemplo, agregar colas de Tx despu\u00e9s de cancelar el registro termina en excepciones de puntero NULL y UaF, como: ERROR: KASAN: use-after-free en kobject_get+0x14/0x90 Lectura de tama\u00f1o 1 en la direcci\u00f3n ffff88801961248c mediante la tarea ethtool/755 CPU : 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778 Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014 Seguimiento de llamadas: dump_stack_lvl+0x57/0x72 print_address_description.constprop.0+0x1f/0x140 kasan_report.cold+0x7f/0x11b kobject_get+0x14/0x90 kobject_add_internal+0x3d1/0x450 kobject_init_and_add+0xba/0xf0 netdev_queue_update_kobjects+0xcf/0x200 netif_set_real_num_tx_queues+0xb4/0x310 veth_set_channels+0x1c3/0x550 ethnl_set_channels+0x524/ 0x610"}], "id": "CVE-2021-47517", "lastModified": "2026-08-04T10:17:07.130", "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": 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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47517", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-24T19:18:28.551288Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:13.347", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ethtool: do not perform operations on net devices being unregistered", "id": "2283434", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283434"}, "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-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nethtool: do not perform operations on net devices being unregistered\nThere is a short period between a net device starts to be unregistered\nand when it is actually gone. In that time frame ethtool operations\ncould still be performed, which might end up in unwanted or undefined\nbehaviours[1].\nDo not allow ethtool operations after a net device starts its\nunregistration. This patch targets the netlink part as the ioctl one\nisn't affected: the reference to the net device is taken and the\noperation is executed within an rtnl lock section and the net device\nwon't be found after unregister.\n[1] For example adding Tx queues after unregister ends up in NULL\npointer exceptions and UaFs, such as:\nBUG: KASAN: use-after-free in kobject_get+0x14/0x90\nRead of size 1 at addr ffff88801961248c by task ethtool/755\nCPU: 0 PID: 755 Comm: ethtool Not tainted 5.15.0-rc6+ #778\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/014\nCall Trace:\ndump_stack_lvl+0x57/0x72\nprint_address_description.constprop.0+0x1f/0x140\nkasan_report.cold+0x7f/0x11b\nkobject_get+0x14/0x90\nkobject_add_internal+0x3d1/0x450\nkobject_init_and_add+0xba/0xf0\nnetdev_queue_update_kobjects+0xcf/0x200\nnetif_set_real_num_tx_queues+0xb4/0x310\nveth_set_channels+0x1c3/0x550\nethnl_set_channels+0x524/0x610"], "name": "CVE-2021-47517", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47517\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47517\nhttps://lore.kernel.org/linux-cve-announce/2024052432-CVE-2021-47517-df40@gregkh/T"], "threat_severity": "Low"}

{}