{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31720",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.134Z",
        "datePublished": "2026-05-01T14:14:22.832Z",
        "dateUpdated": "2026-05-11T22:14:27.286Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T22:14:27.286Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/usb/gadget/function/f_uac1_legacy.c"
                    ],
                    "versions": [
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "557d1d4e862eccd0b74cc377b66de3e1e8d49605",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "21b11e8581285c6f10ef43d05df349d445f24273",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "0d41772d98dcaf6c17e875b7d0ea0154ae1191ee",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "c6da4fed7537aec19880c24f6c3a95065adb1406",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "8e5eb1d6e6a3d7bbea9c92132d0cda5793176426",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "26304d124e7f0383f8fe1168b5801a0ac7e16b1c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c6994e6f067cf0fc4c6cca3d164018b1150916f8",
                            "lessThan": "6e0e34d85cd46ceb37d16054e97a373a32770f6c",
                            "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/usb/gadget/function/f_uac1_legacy.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.31",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.31",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.253",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.168",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.134",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.81",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "2.6.31",
                                    "versionEndExcluding": "5.10.253"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "5.15.203"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "6.1.168"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "6.6.134"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "6.12.81"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "6.18.22"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "6.19.12"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.31",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"
                },
                {
                    "url": "https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406"
                },
                {
                    "url": "https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"
                },
                {
                    "url": "https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c"
                }
            ],
            "title": "usb: gadget: f_uac1_legacy: validate control request size",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}