{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-42271",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: fix use after free in iucv_sock_close()\n\niucv_sever_path() is called from process context and from bh context.\niucv->path is used as indicator whether somebody else is taking care of\nsevering the path (or it is already removed / never existed).\nThis needs to be done with atomic compare and swap, otherwise there is a\nsmall window where iucv_sock_close() will try to work with a path that has\nalready been severed and freed by iucv_callback_connrej() called by\niucv_tasklet_fn().\n\nExample:\n[452744.123844] Call Trace:\n[452744.123845] ([<0000001e87f03880>] 0x1e87f03880)\n[452744.123966]  [<00000000d593001e>] iucv_path_sever+0x96/0x138\n[452744.124330]  [<000003ff801ddbca>] iucv_sever_path+0xc2/0xd0 [af_iucv]\n[452744.124336]  [<000003ff801e01b6>] iucv_sock_close+0xa6/0x310 [af_iucv]\n[452744.124341]  [<000003ff801e08cc>] iucv_sock_release+0x3c/0xd0 [af_iucv]\n[452744.124345]  [<00000000d574794e>] __sock_release+0x5e/0xe8\n[452744.124815]  [<00000000d5747a0c>] sock_close+0x34/0x48\n[452744.124820]  [<00000000d5421642>] __fput+0xba/0x268\n[452744.124826]  [<00000000d51b382c>] task_work_run+0xbc/0xf0\n[452744.124832]  [<00000000d5145710>] do_notify_resume+0x88/0x90\n[452744.124841]  [<00000000d5978096>] system_call+0xe2/0x2c8\n[452744.125319] Last Breaking-Event-Address:\n[452744.125321]  [<00000000d5930018>] iucv_path_sever+0x90/0x138\n[452744.125324]\n[452744.125325] Kernel panic - not syncing: Fatal exception in interrupt\n\nNote that bh_lock_sock() is not serializing the tasklet context against\nprocess context, because the check for sock_owned_by_user() and\ncorresponding handling is missing.\n\nIdeas for a future clean-up patch:\nA) Correct usage of bh_lock_sock() in tasklet context, as described in\nRe-enqueue, if needed. This may require adding return values to the\ntasklet functions and thus changes to all users of iucv.\n\nB) Change iucv tasklet into worker and use only lock_sock() in af_iucv."
            }
        ]
    },
    "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": "7d316b945352",
                                            "version_value": "84f40b46787e"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "3.4",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "3.4",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.19.320",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.4.282",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.224",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.165",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.1.104",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.45",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.10.4",
                                                        "lessThanOrEqual": "6.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.11",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01"
            },
            {
                "url": "https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0"
            },
            {
                "url": "https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895"
            },
            {
                "url": "https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5"
            },
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/8b424c9e44111c5a76f41c6b741f8d4c4179d876"
            },
            {
                "url": "https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84"
            },
            {
                "url": "https://git.kernel.org/stable/c/69620522c48ce8215e5eb55ffbab8cafee8f407d",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/69620522c48ce8215e5eb55ffbab8cafee8f407d"
            },
            {
                "url": "https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431"
            }
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