{"id":"CVE-2026-64487","title":"ALSA: caiaq: fix out-of-bounds read in the Traktor Kontrol S4 input parser","summary":"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 (…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < de5f9edc705497b1b2c6b173b22f283486d2fd91","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 884f575cc6acb136eb4a161d925147f85b59c27e","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 05df59b9a61f7ca66548df079d306c41da23845d","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 3cad86197c7bf8b45bb1d8adc1099d0913e80469","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < a5fd3122283bf75c04f6414bf610100beb0565b0","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 0680413f2f10aab43878dd3db711a6a9e45bab7c","Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd","Linux 2.6.37"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:40:21.910578Z"},"published":"2026-07-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:55.344Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64487","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"}],"tags":["cve.org"],"epss":0.00184,"epssPercentile":0.08082,"ingestedAt":"2026-11-06T16:57:43.162Z","slug":"CVE-2026-64487","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < de5f9edc705497b1b2c6b173b22f283486d2fd91`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 70d6d4cfa4ad09688aed2ec8a0cfa72c31f60334`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 884f575cc6acb136eb4a161d925147f85b59c27e`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 05df59b9a61f7ca66548df079d306c41da23845d`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 3cad86197c7bf8b45bb1d8adc1099d0913e80469`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < a5fd3122283bf75c04f6414bf610100beb0565b0`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < 0680413f2f10aab43878dd3db711a6a9e45bab7c`\n- `Linux >= 15c5ab607045e278ebf4d2ca4aea2250617d50ca < f7f3f9fd81e7adbaa12c2e62ee07f0e094a543fd`\n- `Linux 2.6.37`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}