{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50041", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.071Z", "datePublished": "2024-10-21T19:39:40.435Z", "dateUpdated": "2026-08-05T11:41:11.870Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:11.870Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni40e: Fix macvlan leak by synchronizing access to mac_filter_hash\n\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.\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 — `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 — 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 — a guest VM tenant or a VFIO/DPDK userspace driver — 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 — 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 — 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" } } ] } }