{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-46999",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: do asoc update earlier in sctp_sf_do_dupcook_a\n\nThere's a panic that occurs in a few of envs, the call trace is as below:\n\n  [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI\n  [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp]\n  []  sctp_assoc_control_transport+0x1b9/0x210 [sctp]\n  []  sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp]\n  []  sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp]\n  []  sctp_do_sm+0xc3/0x2a0 [sctp]\n  []  sctp_generate_timeout_event+0x81/0xf0 [sctp]\n\nThis is caused by a transport use-after-free issue. When processing a\nduplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK\nand SHUTDOWN chunks are allocated with the transort from the new asoc.\nHowever, later in the sideeffect machine, the old asoc is used to send\nthem out and old asoc's shutdown_last_sent_to is set to the transport\nthat SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually\nbelongs to the new asoc. After the new_asoc is freed and the old asoc\nT2 timeout, the old asoc's shutdown_last_sent_to that is already freed\nwould be accessed in sctp_sf_t2_timer_expire().\n\nThanks Alexander and Jere for helping dig into this issue.\n\nTo fix it, this patch is to do the asoc update first, then allocate\nthe COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This\nwould make more sense, as a chunk from an asoc shouldn't be sent out\nwith another asoc. We had fixed quite a few issues caused by this."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
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                {
                    "vendor_name": "Linux",
                    "product": {
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                            {
                                "product_name": "Linux",
                                "version": {
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                                            "version_name": "db8bf823e70f",
                                            "version_value": "d624f2991b97"
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                                        {
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                                            "version_name": "a204d577be70",
                                            "version_value": "b1b31948c0af"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "145cb2f7177d",
                                            "version_value": "f01988ecf365"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.7",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.7",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
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                                                        "version": "4.19.191",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
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                                                        "version": "5.4.120",
                                                        "lessThanOrEqual": "5.4.*",
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                                                    {
                                                        "version": "5.10.38",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
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                                                    },
                                                    {
                                                        "version": "5.11.22",
                                                        "lessThanOrEqual": "5.11.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
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                                                    {
                                                        "version": "5.12.5",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
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                "name": "https://git.kernel.org/stable/c/f01988ecf3654f805282dce2d3bb9afe68d2691e"
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