CVE-2021-47102

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So, this line cause invalid memory\naccess for another events,\nwhen ptr is not netdev_notifier_changeupper_info.\n\nThe KASAN logs are as follows:\n\n[ 30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778\n[ 30.139866]\n[ 30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6\n[ 30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[ 30.153056] Call trace:\n[ 30.155547] dump_backtrace+0x0/0x2c0\n[ 30.159320] show_stack+0x18/0x30\n[ 30.162729] dump_stack_lvl+0x68/0x84\n[ 30.166491] print_address_description.constprop.0+0x74/0x2b8\n[ 30.172346] kasan_report+0x1e8/0x250\n[ 30.176102] __asan_load8+0x98/0xe0\n[ 30.179682] prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera]\n[ 30.193313] raw_notifier_call_chain+0x74/0xa0\n[ 30.197860] call_netdevice_notifiers_info+0x68/0xc0\n[ 30.202924] register_netdevice+0x3cc/0x760\n[ 30.207190] register_netdev+0x24/0x50\n[ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in a netdev notifier callback reached via local netlink/ioctl paths (register_netdev, ip link up/down, MTU/addr changes) on Marvell Prestera switch ports, not via remote packet processing.\nAC:L - Any non-CHANGEUPPER netdev event on a Prestera port reliably hits the unconditional upper_dev load; the attacker fully controls triggering those events and no race or special memory layout is required.\nPR:L - Triggering requires CAP_NET_ADMIN to manipulate Prestera netdevs (or operations in a netns where that capability is held); per kernel guidance that capability via user namespaces/containers scores as Low, not High.\nUI:N - No victim action is required; the attacker directly drives the netdev events that invoke the vulnerable notifier.\nS:U - Impact stays within the kernel on the local host; this is not a VM/IOMMU/sandbox boundary escape.\nC:H - The bug is a confirmed stack-out-of-bounds read of kernel stack memory beyond the notifier info object; under the scoring rule for OOB reads this is scored High.\nI:N - The OOB-loaded pointer is unused for the buggy event types (only PRECHANGEUPPER/CHANGEUPPER consume upper_dev, and those pass the correct structure), so there is no write or control-flow integrity impact.\nA:H - Stack OOB access is a kernel memory-safety violation that can oops/panic the kernel (as demonstrated by KASAN), yielding High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/marvell/prestera/prestera_main.c"], "versions": [{"version": "3d5048cc54bd250cfbb358c37fcc011135977887", "lessThan": "5c553a0cd1263e4da5f220d80fa713fc3959c1d0", "status": "affected", "versionType": "git"}, {"version": "3d5048cc54bd250cfbb358c37fcc011135977887", "lessThan": "2efc2256febf214e7b2bdaa21fe6c3c3146acdcb", "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/marvell/prestera/prestera_main.c"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.12", "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": "5.14", "versionEndExcluding": "5.15.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0"}, {"url": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb"}], "title": "net: marvell: prestera: fix incorrect structure access", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47102", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-03-05T16:07:00.454829Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:15:11.035Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.915Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb", "tags": ["x_transferred"]}]}]}}

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So, this line cause invalid memory\naccess for another events,\nwhen ptr is not netdev_notifier_changeupper_info.\n\nThe KASAN logs are as follows:\n\n[ 30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778\n[ 30.139866]\n[ 30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6\n[ 30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[ 30.153056] Call trace:\n[ 30.155547] dump_backtrace+0x0/0x2c0\n[ 30.159320] show_stack+0x18/0x30\n[ 30.162729] dump_stack_lvl+0x68/0x84\n[ 30.166491] print_address_description.constprop.0+0x74/0x2b8\n[ 30.172346] kasan_report+0x1e8/0x250\n[ 30.176102] __asan_load8+0x98/0xe0\n[ 30.179682] prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera]\n[ 30.193313] raw_notifier_call_chain+0x74/0xa0\n[ 30.197860] call_netdevice_notifiers_info+0x68/0xc0\n[ 30.202924] register_netdevice+0x3cc/0x760\n[ 30.207190] register_netdev+0x24/0x50\n[ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.12", "versionStartIncluding": "5.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:59.235Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47102", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:45:59.235Z", "dateReserved": "2024-02-29T22:33:44.301Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-04T18:10:56.018Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/marvell/prestera/prestera_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5c553a0cd1263e4da5f220d80fa713fc3959c1d0", "status": "affected", "version": "3d5048cc54bd250cfbb358c37fcc011135977887", "versionType": "git"}, {"lessThan": "2efc2256febf214e7b2bdaa21fe6c3c3146acdcb", "status": "affected", "version": "3d5048cc54bd250cfbb358c37fcc011135977887", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/marvell/prestera/prestera_main.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"lessThan": "5.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "901A6B90-4B30-4E61-9B88-844D6E11AE47", "versionEndExcluding": "5.15.12", "versionStartIncluding": "5.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*", "matchCriteriaId": "A73429BA-C2D9-4D0C-A75F-06A1CA8B3983", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*", "matchCriteriaId": "F621B5E3-E99D-49E7-90B9-EC3B77C95383", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*", "matchCriteriaId": "F7BFDCAA-1650-49AA-8462-407DD593F94F", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*", "matchCriteriaId": "6EC9882F-866D-4ACB-8FBC-213D8D8436C8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:*", "matchCriteriaId": "8A0915FE-A4AA-4C94-B783-CF29D81E7E54", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: marvell: prestera: fix incorrect structure access\n\nIn line:\n\tupper = info->upper_dev;\nWe access upper_dev field, which is related only for particular events\n(e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memory\naccess for another events,\nwhen ptr is not netdev_notifier_changeupper_info.\n\nThe KASAN logs are as follows:\n\n[ 30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778\n[ 30.139866]\n[ 30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6\n[ 30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[ 30.153056] Call trace:\n[ 30.155547] dump_backtrace+0x0/0x2c0\n[ 30.159320] show_stack+0x18/0x30\n[ 30.162729] dump_stack_lvl+0x68/0x84\n[ 30.166491] print_address_description.constprop.0+0x74/0x2b8\n[ 30.172346] kasan_report+0x1e8/0x250\n[ 30.176102] __asan_load8+0x98/0xe0\n[ 30.179682] prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera]\n[ 30.193313] raw_notifier_call_chain+0x74/0xa0\n[ 30.197860] call_netdevice_notifiers_info+0x68/0xc0\n[ 30.202924] register_netdevice+0x3cc/0x760\n[ 30.207190] register_netdev+0x24/0x50\n[ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera]"}, {"lang": "es", "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: net:marvell:prestera: corrige el acceso a la estructura incorrecta En l\u00ednea: superior = info->upper_dev; Accedemos al campo Upper_dev, que est\u00e1 relacionado s\u00f3lo para eventos particulares (por ejemplo, evento == NETDEV_CHANGEUPPER). Entonces, esta l\u00ednea causa un acceso no v\u00e1lido a la memoria para otros eventos, cuando ptr no es netdev_notifier_changeupper_info. Los registros de KASAN son los siguientes: [30.123165] ERROR: KASAN: pila fuera de los l\u00edmites en prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera] [30.133336] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff80000cf772b0 mediante tarea udevd/778 [ 0x0/0 x2c0 [ 30.159320] show_stack+0x18/0x30 [ 30.162729] dump_stack_lvl+0x68/0x84 [ 30.166491] print_address_description.constprop.0+0x74/0x2b8 [ 30.172346] kasan_report+0x1e8/0x250 [ 3 0.176102] __asan_load8+0x98/0xe0 [ 30.179682] prestera_netdev_port_event.constprop .0+0x68/0x538 [prestera] [ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera] [ 30.193313] raw_notifier_call_chain+0x74/0xa0 [ 30.197860] call_netdevice_notifiers_info+0x68/0xc0 [ 30.202924] registro_netdevice+0x3cc/0x760 [ 30.207190] registro_netdev+0x24 /0x50 [ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera]"}], "id": "CVE-2021-47102", "lastModified": "2026-08-04T10:16:45.600", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47102", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-03-05T16:07:00.454829Z", "version": "2.0.3"}}]}, "published": "2024-03-04T18:15:08.600", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Patch"], "url": "https://git.kernel.org/stable/c/5c553a0cd1263e4da5f220d80fa713fc3959c1d0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: marvell: prestera: fix incorrect structure access", "id": "2267915", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267915"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: marvell: prestera: fix incorrect structure access\nIn line:\nupper = info->upper_dev;\nWe access upper_dev field, which is related only for particular events\n(e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memory\naccess for another events,\nwhen ptr is not netdev_notifier_changeupper_info.\nThe KASAN logs are as follows:\n[ 30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778\n[ 30.139866]\n[ 30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6\n[ 30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[ 30.153056] Call trace:\n[ 30.155547] dump_backtrace+0x0/0x2c0\n[ 30.159320] show_stack+0x18/0x30\n[ 30.162729] dump_stack_lvl+0x68/0x84\n[ 30.166491] print_address_description.constprop.0+0x74/0x2b8\n[ 30.172346] kasan_report+0x1e8/0x250\n[ 30.176102] __asan_load8+0x98/0xe0\n[ 30.179682] prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera]\n[ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera]\n[ 30.193313] raw_notifier_call_chain+0x74/0xa0\n[ 30.197860] call_netdevice_notifiers_info+0x68/0xc0\n[ 30.202924] register_netdevice+0x3cc/0x760\n[ 30.207190] register_netdev+0x24/0x50\n[ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera]"], "name": "CVE-2021-47102", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2024-03-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47102\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47102\nhttps://lore.kernel.org/linux-cve-announce/2024030416-CVE-2021-47102-1335@gregkh/T"], "threat_severity": "Moderate"}

{}