{"api_version":"1","generated_at":"2026-07-31T19:09:48+00:00","cve":"CVE-2026-64487","urls":{"html":"https://cve.report/CVE-2026-64487","api":"https://cve.report/api/cve/CVE-2026-64487.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64487","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64487"},"summary":{"title":"ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:34","updated_at":"2026-07-25 10:17:34"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c","name":"https://git.kernel.org/stable/c/0680413f2f10aab43878dd3db711a6a9e45bab7c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334","name":"https://git.kernel.org/stable/c/70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d","name":"https://git.kernel.org/stable/c/05df59b9a61f7ca66548df079d306c41da23845d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0","name":"https://git.kernel.org/stable/c/a5fd3122283bf75c04f6414bf610100beb0565b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91","name":"https://git.kernel.org/stable/c/de5f9edc705497b1b2c6b173b22f283486d2fd91","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e","name":"https://git.kernel.org/stable/c/884f575cc6acb136eb4a161d925147f85b59c27e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd","name":"https://git.kernel.org/stable/c/f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469","name":"https://git.kernel.org/stable/c/3cad86197c7bf8b45bb1d8adc1099d0913e80469","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64487","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64487","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca de5f9edc705497b1b2c6b173b22f283486d2fd91 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 884f575cc6acb136eb4a161d925147f85b59c27e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 15c5ab607045e278ebf4d2ca4aea2250617d50ca 05df59b9a61f7ca66548df079d306c41da23845d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64487","cve":"CVE-2026-64487","epss":"0.001840000","percentile":"0.083470000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["sound/usb/caiaq/input.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"de5f9edc705497b1b2c6b173b22f283486d2fd91","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"884f575cc6acb136eb4a161d925147f85b59c27e","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"05df59b9a61f7ca66548df079d306c41da23845d","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"3cad86197c7bf8b45bb1d8adc1099d0913e80469","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"a5fd3122283bf75c04f6414bf610100beb0565b0","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"0680413f2f10aab43878dd3db711a6a9e45bab7c","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"},{"lessThan":"f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd","status":"affected","version":"15c5ab607045e278ebf4d2ca4aea2250617d50ca","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["sound/usb/caiaq/input.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.37"},{"lessThan":"2.6.37","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"2.6.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"2.6.37","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:51:46.711Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64487","datePublished":"2026-07-25T08:51:46.711Z","dateReserved":"2026-07-19T15:36:31.792Z","dateUpdated":"2026-07-25T08:51:46.711Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:34","lastModifiedDate":"2026-07-25 10:17:34","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64487","Ordinal":"1","Title":"ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 in","CVE":"CVE-2026-64487","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64487","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 in"}]}}}