{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2021-47649",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-02-26T01:48:21.520Z",
        "datePublished": "2025-02-26T01:54:16.574Z",
        "dateUpdated": "2026-05-11T13:58:35.146Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T13:58:35.146Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudmabuf: validate ubuf->pagecount\n\nSyzbot has reported GPF in sg_alloc_append_table_from_pages(). The\nproblem was in ubuf->pages == ZERO_PTR.\n\nubuf->pagecount is calculated from arguments passed from user-space. If\nuser creates udmabuf with list.size == 0 then ubuf->pagecount will be\nalso equal to zero; it causes kmalloc_array() to return ZERO_PTR.\n\nFix it by validating ubuf->pagecount before passing it to\nkmalloc_array()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/dma-buf/udmabuf.c"
                    ],
                    "versions": [
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "5d50f851dd307c07ca5591297093f19967c834a9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "b267a8118c2b171bf7d67b90ed64154eeab9fae0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "811b667cefbea9cb7511a874b169d6a92907137e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "a3728d32fc61eb0fe283cb8ff60b2c8f751e2202",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "9e9b4a269f84d3230f2af84ff42322db676440d9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fbb0de795078190a9834b3409e4b009cfb18a6d4",
                            "lessThan": "2b6dd600dd72573c23ea180b5b0b2f1813405882",
                            "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/dma-buf/udmabuf.c"
                    ],
                    "versions": [
                        {
                            "version": "4.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.20",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.189",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.110",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.33",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.16.19",
                            "lessThanOrEqual": "5.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.17.2",
                            "lessThanOrEqual": "5.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.18",
                            "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": "4.20",
                                    "versionEndExcluding": "5.4.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.20",
                                    "versionEndExcluding": "5.10.110"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.20",
                                    "versionEndExcluding": "5.15.33"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.20",
                                    "versionEndExcluding": "5.16.19"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.20",
                                    "versionEndExcluding": "5.17.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.20",
                                    "versionEndExcluding": "5.18"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882"
                }
            ],
            "title": "udmabuf: validate ubuf->pagecount",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}