{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2020-36791",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-02-26T17:07:27.435Z",
        "datePublished": "2025-05-07T13:17:33.882Z",
        "dateUpdated": "2026-05-11T13:42:58.296Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T13:42:58.296Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: keep alloc_hash updated after hash allocation\n\nIn commit 599be01ee567 (\"net_sched: fix an OOB access in cls_tcindex\")\nI moved cp->hash calculation before the first\ntcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched.\nThis difference could lead to another out of bound access.\n\ncp->alloc_hash should always be the size allocated, we should\nupdate it after this tcindex_alloc_perfect_hash()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/cls_tcindex.c"
                    ],
                    "versions": [
                        {
                            "version": "73c29d2f6f8ae731b1e09051b69ed3ba2319482b",
                            "lessThan": "d6cdc5bb19b595486fb2e6661e5138d73a57f454",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b974ac51f5834a729de252fc5c1c9de9efd79b45",
                            "lessThan": "c4453d2833671e3a9f6bd52f0f581056c3736386",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6cb448ee493c8a514c9afa0c346f3f5b3227de85",
                            "lessThan": "9f8b6c44be178c2498a00b270872a6e30e7c8266",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "478c4b2ffd44e5186c7e22ae7c38a86a5b9cfde5",
                            "lessThan": "557d015ffb27b672e24e6ad141fd887783871dc2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd8142a6fa5270783d415292ec8169f4ea2a5468",
                            "lessThan": "d23faf32e577922b6da20bf3740625c1105381bf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2c66ff8d08f81bcf8e8cb22e31e39c051b15336a",
                            "lessThan": "bd3ee8fb6371b45c71c9345cc359b94da2ddefa9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "599be01ee567b61f4471ee8078870847d0a11e8e",
                            "lessThan": "0d1c3530e1bd38382edef72591b78e877e0edcd3",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/cls_tcindex.c"
                    ],
                    "versions": [
                        {
                            "version": "4.4.214",
                            "lessThan": "4.4.218",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.9.214",
                            "lessThan": "4.9.218",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.14.171",
                            "lessThan": "4.14.175",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.19.103",
                            "lessThan": "4.19.114",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.19",
                            "lessThan": "5.4.29",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.5.3",
                            "lessThan": "5.5.14",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4.214",
                                    "versionEndExcluding": "4.4.218"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.9.214",
                                    "versionEndExcluding": "4.9.218"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.14.171",
                                    "versionEndExcluding": "4.14.175"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.19.103",
                                    "versionEndExcluding": "4.19.114"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.4.19",
                                    "versionEndExcluding": "5.4.29"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.5.3",
                                    "versionEndExcluding": "5.5.14"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266"
                },
                {
                    "url": "https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3"
                },
                {
                    "url": "https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534"
                },
                {
                    "url": "https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html"
                }
            ],
            "title": "net_sched: keep alloc_hash updated after hash allocation",
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}