{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47400", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.816Z", "datePublished": "2024-05-21T15:03:55.368Z", "dateUpdated": "2026-08-05T08:47:40.000Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:40.000Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hns3: do not allow call hns3_nic_net_open repeatedly\n\nhns3_nic_net_open() is not allowed to called repeatly, but there\nis no checking for this. When doing device reset and setup tc\nconcurrently, there is a small oppotunity to call hns3_nic_net_open\nrepeatedly, and cause kernel bug by calling napi_enable twice.\n\nThe calltrace information is like below:\n[ 3078.222780] ------------[ cut here ]------------\n[ 3078.230255] kernel BUG at net/core/dev.c:6991!\n[ 3078.236224] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP\n[ 3078.243431] Modules linked in: hns3 hclgevf hclge hnae3 vfio_iommu_type1 vfio_pci vfio_virqfd vfio pv680_mii(O)\n[ 3078.258880] CPU: 0 PID: 295 Comm: kworker/u8:5 Tainted: G O 5.14.0-rc4+ #1\n[ 3078.269102] Hardware name: , BIOS KpxxxFPGA 1P B600 V181 08/12/2021\n[ 3078.276801] Workqueue: hclge hclge_service_task [hclge]\n[ 3078.288774] pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)\n[ 3078.296168] pc : napi_enable+0x80/0x84\ntc qdisc sho[w 3d0e7v8 .e3t0h218 79] lr : hns3_nic_net_open+0x138/0x510 [hns3]\n\n[ 3078.314771] sp : ffff8000108abb20\n[ 3078.319099] x29: ffff8000108abb20 x28: 0000000000000000 x27: ffff0820a8490300\n[ 3078.329121] x26: 0000000000000001 x25: ffff08209cfc6200 x24: 0000000000000000\n[ 3078.339044] x23: ffff0820a8490300 x22: ffff08209cd76000 x21: ffff0820abfe3880\n[ 3078.349018] x20: 0000000000000000 x19: ffff08209cd76900 x18: 0000000000000000\n[ 3078.358620] x17: 0000000000000000 x16: ffffc816e1727a50 x15: 0000ffff8f4ff930\n[ 3078.368895] x14: 0000000000000000 x13: 0000000000000000 x12: 0000259e9dbeb6b4\n[ 3078.377987] x11: 0096a8f7e764eb40 x10: 634615ad28d3eab5 x9 : ffffc816ad8885b8\n[ 3078.387091] x8 : ffff08209cfc6fb8 x7 : ffff0820ac0da058 x6 : ffff0820a8490344\n[ 3078.396356] x5 : 0000000000000140 x4 : 0000000000000003 x3 : ffff08209cd76938\n[ 3078.405365] x2 : 0000000000000000 x1 : 0000000000000010 x0 : ffff0820abfe38a0\n[ 3078.414657] Call trace:\n[ 3078.418517] napi_enable+0x80/0x84\n[ 3078.424626] hns3_reset_notify_up_enet+0x78/0xd0 [hns3]\n[ 3078.433469] hns3_reset_notify+0x64/0x80 [hns3]\n[ 3078.441430] hclge_notify_client+0x68/0xb0 [hclge]\n[ 3078.450511] hclge_reset_rebuild+0x524/0x884 [hclge]\n[ 3078.458879] hclge_reset_service_task+0x3c4/0x680 [hclge]\n[ 3078.467470] hclge_service_task+0xb0/0xb54 [hclge]\n[ 3078.475675] process_one_work+0x1dc/0x48c\n[ 3078.481888] worker_thread+0x15c/0x464\n[ 3078.487104] kthread+0x160/0x170\n[ 3078.492479] ret_from_fork+0x10/0x18\n[ 3078.498785] Code: c8027c81 35ffffa2 d50323bf d65f03c0 (d4210000)\n[ 3078.506889] ---[ end trace 8ebe0340a1b0fb44 ]---\n\nOnce hns3_nic_net_open() is excute success, the flag\nHNS3_NIC_STATE_DOWN will be cleared. So add checking for this\nflag, directly return when HNS3_NIC_STATE_DOWN is no set." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires local netlink/ioctl access to the hns3 PF (tc mqprio via ndo_setup_tc and/or ethtool reset), not remotely delivered packets or adjacent-network protocols.\nAC:L - An attacker with CAP_NET_ADMIN can trigger both sides of the race (ethtool --reset schedules hclge_reset_rebuild, which drops rtnl between phases, while concurrently running tc mqprio setup_tc) and retry until the window is hit.\nPR:L - Triggering setup_tc and ethtool reset requires CAP_NET_ADMIN in the netns that owns the hns3 PF; that capability is obtainable via user namespaces when the device is present in that netns, so this is Low rather than High.\nUI:N - The attacker directly issues the reset and tc configuration operations; no separate victim action is required.\nS:U - Impact is confined to the host kernel that owns the hns3 driver; there is no VM/IOMMU/sandbox boundary crossing.\nC:H - The second hns3_nic_net_open runs hns3_nic_reset_all_ring/hns3_clear_tx_ring on rings that are already live, freeing in-flight skbs/DMA buffers while NAPI/Tx may still reference them, yielding a UAF-class disclosure primitive.\nI:H - The same live-ring clear/reuse before the duplicate napi_enable enables double-free/UAF of descriptor buffers and skbs, which is exploitable for integrity compromise and control-flow hijacking.\nA:H - The duplicate napi_enable path hits BUG_ON(!NAPI_STATE_SCHED) in net/core/dev.c, producing a kernel BUG/oops and denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/hisilicon/hns3/hns3_enet.c" ], "versions": [ { "version": "e888402789b9db5de4fcda361331d66dbf0cd9fd", "lessThan": "5a31d4e73ada8022427b69b10fd1f01a6a8d4b3d", "status": "affected", "versionType": "git" }, { "version": "e888402789b9db5de4fcda361331d66dbf0cd9fd", "lessThan": "f8ba689cb69523144d10606096ef686002dd7285", "status": "affected", "versionType": "git" }, { "version": "e888402789b9db5de4fcda361331d66dbf0cd9fd", "lessThan": "3dac38bdce7932901b9f0b71c62331852c809e61", "status": "affected", "versionType": "git" }, { "version": "e888402789b9db5de4fcda361331d66dbf0cd9fd", "lessThan": "5b09e88e1bf7fe86540fab4b5f3eece8abead39e", "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/hisilicon/hns3/hns3_enet.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.151", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.71", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.14.10", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15", "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": "5.0", "versionEndExcluding": "5.4.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.71" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.14.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5a31d4e73ada8022427b69b10fd1f01a6a8d4b3d" }, { "url": "https://git.kernel.org/stable/c/f8ba689cb69523144d10606096ef686002dd7285" }, { "url": "https://git.kernel.org/stable/c/3dac38bdce7932901b9f0b71c62331852c809e61" }, { "url": "https://git.kernel.org/stable/c/5b09e88e1bf7fe86540fab4b5f3eece8abead39e" } ], "title": "net: hns3: do not allow call hns3_nic_net_open repeatedly", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 4, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-05-28T18:26:38.689847Z", "id": "CVE-2021-47400", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-01T17:45:26.295Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.446Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/5a31d4e73ada8022427b69b10fd1f01a6a8d4b3d", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f8ba689cb69523144d10606096ef686002dd7285", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3dac38bdce7932901b9f0b71c62331852c809e61", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/5b09e88e1bf7fe86540fab4b5f3eece8abead39e", "tags": [ "x_transferred" ] } ] } ] } }