{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2021-47515",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-24T15:02:54.824Z",
        "datePublished": "2024-05-24T15:09:29.334Z",
        "dateUpdated": "2024-09-11T17:32:52.378Z"
    },
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                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:09:18.146Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix the iif in the IPv6 socket control block\n\nWhen an IPv4 packet is received, the ip_rcv_core(...) sets the receiving\ninterface index into the IPv4 socket control block (v5.16-rc4,\nnet/ipv4/ip_input.c line 510):\n\n    IPCB(skb)->iif = skb->skb_iif;\n\nIf that IPv4 packet is meant to be encapsulated in an outer IPv6+SRH\nheader, the seg6_do_srh_encap(...) performs the required encapsulation.\nIn this case, the seg6_do_srh_encap function clears the IPv6 socket control\nblock (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163):\n\n    memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));\n\nThe memset(...) was introduced in commit ef489749aae5 (\"ipv6: sr: clear\nIP6CB(skb) on SRH ip4ip6 encapsulation\") a long time ago (2019-01-29).\n\nSince the IPv6 socket control block and the IPv4 socket control block share\nthe same memory area (skb->cb), the receiving interface index info is lost\n(IP6CB(skb)->iif is set to zero).\n\nAs a side effect, that condition triggers a NULL pointer dereference if\ncommit 0857d6f8c759 (\"ipv6: When forwarding count rx stats on the orig\nnetdev\") is applied.\n\nTo fix that issue, we set the IP6CB(skb)->iif with the index of the\nreceiving interface once again."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/seg6_iptunnel.c"
                    ],
                    "versions": [
                        {
                            "version": "c630ec8bdada",
                            "lessThan": "b16d412e5f79",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2f704348c93f",
                            "lessThan": "6431e71093f3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef489749aae5",
                            "lessThan": "ef8804e47c0a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef489749aae5",
                            "lessThan": "666521b3852d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef489749aae5",
                            "lessThan": "98adb2bbfa40",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef489749aae5",
                            "lessThan": "ae68d93354e5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/seg6_iptunnel.c"
                    ],
                    "versions": [
                        {
                            "version": "5.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.0",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.14.258",
                            "lessThanOrEqual": "4.14.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.19.221",
                            "lessThanOrEqual": "4.19.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.4.165",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.10.85",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.15.8",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.16",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/b16d412e5f79734033df04e97d7ea2f50a8e9fe3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6431e71093f3da586a00c6d931481ffb0dc2db0e"
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                },
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                    "url": "https://git.kernel.org/stable/c/98adb2bbfa407c9290bda299d4c6f7a1c4ebd5e1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ae68d93354e5bf5191ee673982251864ea24dd5c"
                }
            ],
            "title": "seg6: fix the iif in the IPv6 socket control block",
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                "engine": "bippy-a5840b7849dd"
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                    "dateUpdated": "2024-08-04T05:39:59.755Z"
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                "title": "CVE Program Container",
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            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2021-47515",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
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                                ],
                                "version": "2.0.3",
                                "timestamp": "2024-09-10T15:35:33.340330Z"
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                "title": "CISA ADP Vulnrichment",
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