{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47485", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-22T06:20:56.201Z", "datePublished": "2024-05-22T08:19:36.158Z", "dateUpdated": "2026-08-05T08:48:01.651Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:01.651Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields\n\nOverflowing either addrlimit or bytes_togo can allow userspace to trigger\na buffer overflow of kernel memory. Check for overflows in all the places\ndoing math on user controlled buffers." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached only via local writev/write_iter on the qib char device (/dev/ipath) after context assignment; it is not triggered by remote InfiniBand packet processing.\nAC:L - The attacker fully controls iovec lengths and PBC/header fields that drive the overflowing arithmetic, so the heap overflow can be triggered reliably once the QIB device is present and SDMA is running.\nPR:L - No capabilities are checked on the open/assign/writev path; access is only gated by /dev/ipath permissions, and this userspace SDMA interface is intended for unprivileged PSM/MPI processes on systems with the HCA.\nUI:N - The attacker opens the device and issues crafted write/writev calls themselves; no separate victim action is required.\nS:U - Impact is kernel memory corruption and privilege escalation on the same host authority, not a cross-boundary escape (VM/IOMMU/sandbox).\nC:H - A controllable kernel heap buffer overflow can be leveraged for arbitrary kernel memory disclosure.\nI:H - Kernel heap overflow of qib_user_sdma_pkt addr[]/adjacent memory enables arbitrary write and control-flow hijacking for full integrity compromise.\nA:H - The same heap corruption can cause kernel oops/panic or hang, fully impacting availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/qib/qib_user_sdma.c" ], "versions": [ { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "bda41654b6e0c125a624ca35d6d20beb8015b5d0", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "3f57c3f67fd93b4da86aeffea1ca32c484d054ad", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "60833707b968d5ae02a75edb7886dcd4a957cf0d", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "73d2892148aa4397a885b4f4afcfc5b27a325c42", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "0f8cdfff06829a0b0348b6debc29ff6a61967724", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "c3e17e58f571f34c51aeb17274ed02c2ed5cf780", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "0d4395477741608d123dad51def9fe50b7ebe952", "status": "affected", "versionType": "git" }, { "version": "f931551bafe1f10ded7f5282e2aa162c267a2e5d", "lessThan": "d39bf40e55e666b5905fdbd46a0dced030ce87be", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/hw/qib/qib_user_sdma.c" ], "versions": [ { "version": "2.6.35", "status": "affected" }, { "version": "0", "lessThan": "2.6.35", "status": "unaffected", "versionType": "semver" }, { "version": "4.4.292", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.290", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.255", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.216", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.157", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.77", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.14.16", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "4.4.292" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "4.9.290" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "4.14.255" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "4.19.216" 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