{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47196", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-25T09:12:14.115Z", "datePublished": "2024-04-10T18:56:32.634Z", "dateUpdated": "2026-08-05T08:46:39.150Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:39.150Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Set send and receive CQ before forwarding to the driver\n\nPreset both receive and send CQ pointers prior to call to the drivers and\noverwrite it later again till the mlx4 is going to be changed do not\noverwrite ibqp properties.\n\nThis change is needed for mlx5, because in case of QP creation failure, it\nwill go to the path of QP destroy which relies on proper CQ pointers.\n\n BUG: KASAN: use-after-free in create_qp.cold+0x164/0x16e [mlx5_ib]\n Write of size 8 at addr ffff8880064c55c0 by task a.out/246\n\n CPU: 0 PID: 246 Comm: a.out Not tainted 5.15.0+ #291\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n Call Trace:\n dump_stack_lvl+0x45/0x59\n print_address_description.constprop.0+0x1f/0x140\n kasan_report.cold+0x83/0xdf\n create_qp.cold+0x164/0x16e [mlx5_ib]\n mlx5_ib_create_qp+0x358/0x28a0 [mlx5_ib]\n create_qp.part.0+0x45b/0x6a0 [ib_core]\n ib_create_qp_user+0x97/0x150 [ib_core]\n ib_uverbs_handler_UVERBS_METHOD_QP_CREATE+0x92c/0x1250 [ib_uverbs]\n ib_uverbs_cmd_verbs+0x1c38/0x3150 [ib_uverbs]\n ib_uverbs_ioctl+0x169/0x260 [ib_uverbs]\n __x64_sys_ioctl+0x866/0x14d0\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Allocated by task 246:\n kasan_save_stack+0x1b/0x40\n __kasan_kmalloc+0xa4/0xd0\n create_qp.part.0+0x92/0x6a0 [ib_core]\n ib_create_qp_user+0x97/0x150 [ib_core]\n ib_uverbs_handler_UVERBS_METHOD_QP_CREATE+0x92c/0x1250 [ib_uverbs]\n ib_uverbs_cmd_verbs+0x1c38/0x3150 [ib_uverbs]\n ib_uverbs_ioctl+0x169/0x260 [ib_uverbs]\n __x64_sys_ioctl+0x866/0x14d0\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n Freed by task 246:\n kasan_save_stack+0x1b/0x40\n kasan_set_track+0x1c/0x30\n kasan_set_free_info+0x20/0x30\n __kasan_slab_free+0x10c/0x150\n slab_free_freelist_hook+0xb4/0x1b0\n kfree+0xe7/0x2a0\n create_qp.part.0+0x52b/0x6a0 [ib_core]\n ib_create_qp_user+0x97/0x150 [ib_core]\n ib_uverbs_handler_UVERBS_METHOD_QP_CREATE+0x92c/0x1250 [ib_uverbs]\n ib_uverbs_cmd_verbs+0x1c38/0x3150 [ib_uverbs]\n ib_uverbs_ioctl+0x169/0x260 [ib_uverbs]\n __x64_sys_ioctl+0x866/0x14d0\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae" } ], "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 - The bug is reached only through local RDMA userspace verbs (ioctl/write on /dev/infiniband/uverbsN → UVERBS_METHOD_QP_CREATE → ib_create_qp_user → create_qp), not via remotely processed packets.\nAC:L - An attacker who can open uverbs can reliably force the failure path (e.g., successful mlx5 QP create that links into CQ lists, then a post-create failure such as a bad response buffer) without depending on races or other conditions outside their control.\nPR:L - Creating a QP requires only an unprivileged local process with access to the uverbs device; documentation states verbs are intended for non-privileged use, and only special QP types (e.g., RAW_PACKET) need CAP_NET_RAW.\nUI:N - The attacker triggers the vulnerable QP create/destroy path themselves via their own uverbs commands; no victim action is required.\nS:U - Impact is confined to the local kernel privilege boundary (memory corruption / potential privilege escalation); it does not cross a VM, IOMMU, or other separate security authority.\nC:H - This is a heap use-after-free (QP remains on CQ lists after kfree), which can be leveraged for arbitrary kernel memory disclosure via UAF primitives.\nI:H - The same UAF/list corruption yields a write primitive suitable for heap manipulation and control-flow hijacking, so integrity impact is High.\nA:H - The UAF reliably causes kernel memory corruption and can oops/panic the kernel even when not fully exploited for code execution." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/core/verbs.c" ], "versions": [ { "version": "514aee660df493cd673154a6ba6bab745ec47b8c", "lessThan": "b70e072feffa0ba5c41a99b9524b9878dee7748e", "status": "affected", "versionType": "git" }, { "version": "514aee660df493cd673154a6ba6bab745ec47b8c", "lessThan": "6cd7397d01c4a3e09757840299e4f114f0aa5fa0", "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/infiniband/core/verbs.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "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", "versionEndExcluding": "5.15.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b70e072feffa0ba5c41a99b9524b9878dee7748e" }, { "url": "https://git.kernel.org/stable/c/6cd7397d01c4a3e09757840299e4f114f0aa5fa0" } ], "title": "RDMA/core: Set send and receive CQ before forwarding to the driver", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-47196", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-04-10T19:32:29.319944Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:15:04.498Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.459Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/b70e072feffa0ba5c41a99b9524b9878dee7748e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6cd7397d01c4a3e09757840299e4f114f0aa5fa0", "tags": [ "x_transferred" ] } ] } ] } }