248 lines
12 KiB
JSON
248 lines
12 KiB
JSON
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"cveId": "CVE-2021-47201",
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"dateReserved": "2024-03-25T09:12:14.117Z",
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"datePublished": "2024-04-10T18:56:35.774Z",
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"dateUpdated": "2026-08-05T08:46:42.381Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niavf: free q_vectors before queues in iavf_disable_vf\n\niavf_free_queues() clears adapter->num_active_queues, which\niavf_free_q_vectors() relies on, so swap the order of these two function\ncalls in iavf_disable_vf(). This resolves a panic encountered when the\ninterface is disabled and then later brought up again after PF\ncommunication is restored."
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"value": "AV:L - The bug is in the iavf VF driver’s local reset/disable path (iavf_reset_task → iavf_disable_vf → iavf_free_q_vectors), reached via local netdev operations such as MTU/ethtool-driven resets or PF-reset handling—not by processing remote packets.\nAC:L - Once iavf_disable_vf runs, freeing q_vectors without netif_napi_del is fully deterministic with no race to win. A local actor can repeatedly schedule VF resets, and in the worst reasonable SR-IOV deployment PF communication failures/restoration (the commit’s own scenario) make this path reachable under attacker-driven reset pressure.\nPR:L - Triggering the reset/reopen path only requires CAP_NET_ADMIN in the netns that owns the VF (e.g. ip link set mtu / ifup). SR-IOV VFs are routinely delegated into tenant/container netnses where that capability is available via user namespaces without init-namespace root.\nUI:N - The attacker schedules resets and can bring the interface back up after PF communication is restored (or recovery proceeds via the watchdog); no separate victim action is required.\nS:U - The dangling napi_struct UAF corrupts kernel heap within the same OS authority that runs iavf. This is standard local kernel compromise/DoS, not a guest-to-host escape or IOMMU boundary bypass.\nC:H - q_vectors (containing napi_structs) are kfree’d while still linked on netdev->napi_list, leaving dangling pointers. An attacker can reoccupy the freed object; subsequent NAPI list walks read attacker-controlled state (as in the related iavf NAPI UAF CVE-2023-53556), enabling high confidentiality impact.\nI:H - Later napi_del/list walks perform list_del_rcu and related writes on the freed napi_struct, yielding arbitrary-write primitives via forged next/prev pointers, sufficient for control-flow hijacking under kernel UAF guidance.\nA:H - The commit documents a kernel panic when the interface is brought back up after PF communication is restored; any walk of the corrupted napi_list (reinit, free_netdev, etc.) can oops/panic the kernel."
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