{"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"}}]}}