CVE-2024-50041

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The leak occurs when multiple\nthreads attempt to modify the mac_filter_hash simultaneously, leading to\ninconsistent state and potential memory leaks.\n\nTo fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing\nvf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock),\nensuring atomic operations and preventing concurrent access.\n\nAdditionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in\ni40e_add_mac_filter() to help catch similar issues in the future.\n\nReproduction steps:\n1. Spawn VFs and configure port vlan on them.\n2. Trigger concurrent macvlan operations (e.g., adding and deleting\n\tportvlan and/or mac filters).\n3. Observe the potential memory leak and inconsistent state in the\n\tmac_filter_hash.\n\nThis synchronization ensures the integrity of the mac_filter_hash and prevents\nthe described leak."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached only through the i40e virtchnl mailbox from an assigned SR-IOV VF (PCIe transport) or from host-side netdev operations, not from network packets. This is logical local access to the device, so Local.\nAC:L - The attacker deterministically controls the unlocked side \u2014 `vf->driver_caps` is taken verbatim from the VF message so the gating condition is attacker-selected, and `VIRTCHNL_OP_GET_VF_RESOURCES` can be replayed without limit \u2014 while pre-populating MAC/VLAN filters lengthens the unlocked hash walk, which runs in preemptible workqueue context; on lockdep kernels the assertion fires with no race needed at all.\nPR:L - The attacker is the owner of an assigned VF \u2014 a guest VM tenant or a VFIO/DPDK userspace driver \u2014 holding no privilege on the host kernel beyond the granted device, and no host-side capability, root, or trusted-VF flag is required (the path runs before any privilege check and untrusted VFs reach it).\nUI:N - The guest drives the vulnerable path entirely on its own by writing virtchnl messages to its mailbox; no victim action is needed to enable the attack, and the deterministic lockdep-assert path requires nothing from anyone else.\nS:C - The virtchnl handler is the PF's service surface for a VF that belongs to a separate security authority (guest VM / VFIO container), and successful exploitation corrupts host kernel memory \u2014 a guest-to-host boundary crossing analogous to a hypervisor escape.\nC:H - Unsynchronized `hash_for_each_safe()` racing a concurrent `kfree()` in `i40e_sync_vsi_filters()` produces a use-after-free on a kmalloc-32 `struct i40e_mac_filter`, and corrupted hlist traversal follows attacker-groomable pointers into reallocated memory, enabling kernel heap disclosure.\nI:H - `__i40e_del_filter()` writes `f->state` into freed memory and `hash_del()` performs `*pprev = next` using pointers from a reallocated, attacker-sprayed 32-byte object \u2014 a write-what-where primitive; concurrent unlink from both sides also yields a double free.\nA:H - Concurrent unlocked hlist manipulation corrupts the filter hash, causing use-after-free, double free, and lost entries (the reported leak), any of which panic the host kernel; on `CONFIG_PROVE_LOCKING` builds a guest can also trigger the `lockdep_assert_held()` WARN on demand, which is fatal under `panic_on_warn`."}]}], "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/i40e/i40e_main.c", "drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c"], "versions": [{"version": "ddec6cbbe22781d17965f1e6386e5a6363c058d2", "lessThan": "9db6ce9e2738b05a3672aff4d42169cf3bb5a3e3", "status": "affected", "versionType": "git"}, {"version": "fed0d9f13266a22ce1fc9a97521ef9cdc6271a23", "lessThan": "9a9747288ba0a9ad4f5c9877f18dd245770ad64e", "status": "affected", "versionType": "git"}, {"version": "fed0d9f13266a22ce1fc9a97521ef9cdc6271a23", "lessThan": "703c4d820b31bcadf465288d5746c53445f02a55", "status": "affected", "versionType": "git"}, {"version": "fed0d9f13266a22ce1fc9a97521ef9cdc6271a23", "lessThan": "8831abff1bd5b6bc8224f0c0671f46fbd702b5b2", "status": "affected", "versionType": "git"}, {"version": "fed0d9f13266a22ce1fc9a97521ef9cdc6271a23", "lessThan": "dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb", "status": "affected", "versionType": "git"}, {"version": "8bfcbaa379694e05290fcff21f4bd40afcf88776", "status": "affected", "versionType": "git"}, {"version": "5.15.54", "lessThan": "5.15.168", "status": "affected", "versionType": "semver"}, {"version": "5.18.11", "lessThan": "5.19", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/intel/i40e/i40e_main.c", "drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.57", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "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": "5.15.54", "versionEndExcluding": "5.15.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.11.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9db6ce9e2738b05a3672aff4d42169cf3bb5a3e3"}, {"url": "https://git.kernel.org/stable/c/9a9747288ba0a9ad4f5c9877f18dd245770ad64e"}, {"url": "https://git.kernel.org/stable/c/703c4d820b31bcadf465288d5746c53445f02a55"}, {"url": "https://git.kernel.org/stable/c/8831abff1bd5b6bc8224f0c0671f46fbd702b5b2"}, {"url": "https://git.kernel.org/stable/c/dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb"}], "title": "i40e: Fix macvlan leak by synchronizing access to mac_filter_hash", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-50041", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:24:46.896116Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:28:44.245Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:24:48.319Z"}}]}}

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The leak occurs when multiple\nthreads attempt to modify the mac_filter_hash simultaneously, leading to\ninconsistent state and potential memory leaks.\n\nTo fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing\nvf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock),\nensuring atomic operations and preventing concurrent access.\n\nAdditionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in\ni40e_add_mac_filter() to help catch similar issues in the future.\n\nReproduction steps:\n1. Spawn VFs and configure port vlan on them.\n2. Trigger concurrent macvlan operations (e.g., adding and deleting\n\tportvlan and/or mac filters).\n3. 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The leak occurs when multiple\nthreads attempt to modify the mac_filter_hash simultaneously, leading to\ninconsistent state and potential memory leaks.\n\nTo fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing\nvf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock),\nensuring atomic operations and preventing concurrent access.\n\nAdditionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in\ni40e_add_mac_filter() to help catch similar issues in the future.\n\nReproduction steps:\n1. Spawn VFs and configure port vlan on them.\n2. Trigger concurrent macvlan operations (e.g., adding and deleting\n\tportvlan and/or mac filters).\n3. Observe the potential memory leak and inconsistent state in the\n\tmac_filter_hash.\n\nThis synchronization ensures the integrity of the mac_filter_hash and prevents\nthe described leak."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: i40e: Corregir p\u00e9rdida de macvlan sincronizando el acceso a mac_filter_hash Este parche soluciona un problema de p\u00e9rdida de macvlan en el controlador i40e causado por el acceso simult\u00e1neo a vsi->mac_filter_hash. La p\u00e9rdida se produce cuando varios subprocesos intentan modificar mac_filter_hash simult\u00e1neamente, lo que genera un estado inconsistente y posibles p\u00e9rdidas de memoria. Para solucionar esto, ahora envolvemos las llamadas a i40e_del_mac_filter() y ponemos a cero vf->default_lan_addr.addr con spin_lock/unlock_bh(&vsi->mac_filter_hash_lock), lo que garantiza operaciones at\u00f3micas y evita el acceso simult\u00e1neo. Adem\u00e1s, agregamos lockdep_assert_held(&vsi->mac_filter_hash_lock) en i40e_add_mac_filter() para ayudar a detectar problemas similares en el futuro. Pasos de reproducci\u00f3n: 1. Genere VFs y configure el puerto VLAN en ellos. 2. Active operaciones MACVLAN simult\u00e1neas (por ejemplo, agregar y eliminar filtros MAC o PortVLAN). 3. Observe la posible p\u00e9rdida de memoria y el estado inconsistente en el hash de filtro MAC. Esta sincronizaci\u00f3n garantiza la integridad del hash de filtro MAC y evita la p\u00e9rdida descrita."}], "id": "CVE-2024-50041", "lastModified": "2026-08-04T11:21:11.180", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "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-2024-50041", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:24:46.896116Z", "version": "2.0.3"}}]}, "published": "2024-10-21T20:15:17.133", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/703c4d820b31bcadf465288d5746c53445f02a55"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8831abff1bd5b6bc8224f0c0671f46fbd702b5b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a9747288ba0a9ad4f5c9877f18dd245770ad64e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9db6ce9e2738b05a3672aff4d42169cf3bb5a3e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dac6c7b3d33756d6ce09f00a96ea2ecd79fae9fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: i40e: Fix macvlan leak by synchronizing access to mac_filter_hash", "id": "2320632", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320632"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-401", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ni40e: Fix macvlan leak by synchronizing access to mac_filter_hash\nThis patch addresses a macvlan leak issue in the i40e driver caused by\nconcurrent access to vsi->mac_filter_hash. The leak occurs when multiple\nthreads attempt to modify the mac_filter_hash simultaneously, leading to\ninconsistent state and potential memory leaks.\nTo fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing\nvf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock),\nensuring atomic operations and preventing concurrent access.\nAdditionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in\ni40e_add_mac_filter() to help catch similar issues in the future.\nReproduction steps:\n1. Spawn VFs and configure port vlan on them.\n2. Trigger concurrent macvlan operations (e.g., adding and deleting\nportvlan and/or mac filters).\n3. Observe the potential memory leak and inconsistent state in the\nmac_filter_hash.\nThis synchronization ensures the integrity of the mac_filter_hash and prevents\nthe described leak."], "name": "CVE-2024-50041", "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": "Will not fix", "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": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50041\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50041\nhttps://lore.kernel.org/linux-cve-announce/2024102133-CVE-2024-50041-6118@gregkh/T"], "threat_severity": "Moderate"}

{}