CVE-2020-36791

{"id": "CVE-2020-36791", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "published": "2025-05-07T14:15:28.513", "references": [{"url": "https://blog.cdthoughts.ch/2021/03/16/syzbot-bug.html", "tags": ["Third Party Advisory"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/0d1c3530e1bd38382edef72591b78e877e0edcd3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/557d015ffb27b672e24e6ad141fd887783871dc2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9f8b6c44be178c2498a00b270872a6e30e7c8266", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bd3ee8fb6371b45c71c9345cc359b94da2ddefa9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c4453d2833671e3a9f6bd52f0f581056c3736386", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d23faf32e577922b6da20bf3740625c1105381bf", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d6cdc5bb19b595486fb2e6661e5138d73a57f454", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://syzkaller.appspot.com/bug?id=ea260693da894e7b078d18fca2c9c0a19b457534", "tags": ["Issue Tracking"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "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()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: mantener alloc_hash actualizado tras la asignaci\u00f3n de hash. En el commit 599be01ee567 (\"net_sched: corregir un acceso OOB en cls_tcindex\"), se movi\u00f3 el c\u00e1lculo de cp->hash antes del primer tcindex_alloc_perfect_hash(), pero se mantuvo intacto. Esta diferencia podr\u00eda provocar otro acceso fuera de los l\u00edmites. cp->alloc_hash siempre debe tener el tama\u00f1o asignado; debemos actualizarlo despu\u00e9s de este tcindex_alloc_perfect_hash()."}], "lastModified": "2025-11-10T17:34:55.777", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EA46E804-CC77-4E3E-8EFE-1E0D208F2891", "versionEndExcluding": "4.4.218", "versionStartIncluding": "4.4.214"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "532BFC53-5843-4E9A-9AB3-3898853DD42C", "versionEndExcluding": "4.9.218", "versionStartIncluding": "4.9.214"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "26CFC34C-0C30-400B-A805-EBB9AD56155E", "versionEndExcluding": "4.14.175", "versionStartIncluding": "4.14.171"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "05AC3490-6BEC-4FB4-9577-02840D73CE90", "versionEndExcluding": "4.19.114", "versionStartIncluding": "4.19.103"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9253035D-B349-4044-B4B2-0052B6F8AF01", "versionEndExcluding": "5.4.29", "versionStartIncluding": "5.4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AF089097-DB58-4F52-AC68-3418ADEE10A2", "versionEndExcluding": "5.5.14", "versionStartIncluding": "5.5.3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F5DAF39E-0835-49B4-8221-7FCE81692A4B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "73DFCE15-1BB8-4740-B9CD-57F2DF3EA15D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7D3107F6-EB44-4C65-AA1B-1E96923F6409"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DC0C894E-6323-44E5-89DD-8FB6A5C41CAF"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4C76EAC9-C2E6-4B6F-B002-ADBE74DDD794"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F13B8FBF-E007-4F60-A290-2833B45F8520"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.6:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CD0276C4-2C60-4C52-AC89-F96DF991B858"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}