{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-64487",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T15:36:31.792Z",
        "datePublished": "2026-07-25T08:51:46.711Z",
        "dateUpdated": "2026-08-17T04:56:34.866Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:56:34.866Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser\n\nsnd_usb_caiaq_tks4_dispatch() decodes the Traktor Kontrol S4 input\nstream in fixed 16-byte (TKS4_MSGBLOCK_SIZE) message blocks. On every\niteration it advances buf and subtracts the block size while looping on\n\"while (len)\".\n\nlen is urb->actual_length. That value is supplied by the device and is\nnot guaranteed to be a multiple of 16. When a final short block leaves\nlen between 1 and 15, the loop runs once more, reads up to buf[15], and\nthen does \"len -= TKS4_MSGBLOCK_SIZE\". As len is unsigned this underflows\nto a huge value. The loop then keeps iterating and walking buf far past\nthe end of the 512-byte ep4_in_buf, reading out of bounds until a bogus\nblock id happens to be hit.\n\nIterate only while a full message block is available. This stops the\nunsigned underflow and silently drops any trailing partial block, which\ncarries no complete control value anyway.\n\nThe sibling endpoint-4 parsers are not affected. The Traktor Kontrol X1\nand Maschine arms in snd_usb_caiaq_ep4_reply_dispatch() floor\nurb->actual_length before dispatching."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "sound/usb/caiaq/input.c"
                    ],
                    "versions": [
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "de5f9edc705497b1b2c6b173b22f283486d2fd91",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "884f575cc6acb136eb4a161d925147f85b59c27e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "05df59b9a61f7ca66548df079d306c41da23845d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "3cad86197c7bf8b45bb1d8adc1099d0913e80469",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "a5fd3122283bf75c04f6414bf610100beb0565b0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "0680413f2f10aab43878dd3db711a6a9e45bab7c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "15c5ab607045e278ebf4d2ca4aea2250617d50ca",
                            "lessThan": "f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "sound/usb/caiaq/input.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.37",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.37",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.261",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.212",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.178",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.96",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.39",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.4",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "2.6.37",
                                    "versionEndExcluding": "5.10.261"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.37",
                                    "versionEndExcluding": "5.15.212"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                },
                                {
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                                    "versionStartIncluding": "2.6.37",
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                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.37",
                                    "versionEndExcluding": "7.2"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91"
                },
                {
                    "url": "https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334"
                },
                {
                    "url": "https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd"
                }
            ],
            "title": "ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}