{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47196",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "514aee660df4",
                                            "version_value": "b70e072feffa"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.15",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.15",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.5",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.16",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/b70e072feffa0ba5c41a99b9524b9878dee7748e",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b70e072feffa0ba5c41a99b9524b9878dee7748e"
            },
            {
                "url": "https://git.kernel.org/stable/c/6cd7397d01c4a3e09757840299e4f114f0aa5fa0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/6cd7397d01c4a3e09757840299e4f114f0aa5fa0"
            }
        ]
    },
    "generator": {
        "engine": "bippy-a5840b7849dd"
    }
}