{"id":"CVE-2026-64134","title":"ALSA: pcm: Don't setup bogus iov_iter for silencing","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Don't setup bogus iov_iter for silencing\n\nAt transition to the iov_iter for PCM data transfer, we blindly\napplied the iov_iter setup also for silencing (i.e.…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < 41a766c647294842c9b17672449f8e011048cba9","Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < ce836587e594af39ff048d9b29dee0f5f10692c9","Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < feff0251386aa6bb180a0a1cf7c1f91ba868113d","Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < c9f6768515818d71bdfc20119a81f3332c53b9c6","Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < e4d3386b74fba8e01280484b67ee481ece00201e","Linux 6.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:36:56.282680Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:24.708Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64134","references":[{"url":"https://git.kernel.org/stable/c/41a766c647294842c9b17672449f8e011048cba9"},{"url":"https://git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9"},{"url":"https://git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d"},{"url":"https://git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6"},{"url":"https://git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02219,"ingestedAt":"2026-10-16T17:24:46.807Z","slug":"CVE-2026-64134","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Don't setup bogus iov_iter for silencing\n\nAt transition to the iov_iter for PCM data transfer, we blindly\napplied the iov_iter setup also for silencing (i.e. data = NULL), and\nit leads to a calculation of bogus iov_iter.  Fortunately this didn't\ncause troubles on most of architectures but it goes wrong on RISC-V\nnow, causing a NULL dereference.\n\nHandle the NULL data case to treat the silencing in interleaved_copy()\nfor addressing the bug above.  noninterleaved_copy() has already the\nNULL data handling, so it doesn't need changes.\n\n## Affected\n\n- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < 41a766c647294842c9b17672449f8e011048cba9`\n- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < ce836587e594af39ff048d9b29dee0f5f10692c9`\n- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < feff0251386aa6bb180a0a1cf7c1f91ba868113d`\n- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < c9f6768515818d71bdfc20119a81f3332c53b9c6`\n- `Linux >= cf393babb37a1679a1ec1d864df1090353465e23 < e4d3386b74fba8e01280484b67ee481ece00201e`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}