{"id":"CVE-2026-64483","summary":"ALSA: firewire: isight: bound the sample count to the packet payload","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: firewire: isight: bound the sample count to the packet payload\n\nisight_packet() takes the frame count from the device iso packet and\nchecks it only against the device claimed iso length.\n\n\tcount = be32_to_cpu(payload-\u003esample_count);\n\tif (likely(count \u003c= (length - 16) / 4))\n\t\tisight_samples(isight, payload-\u003esamples, count);\n\nlength is the iso header data_length. It can be up to 0xffff. So the\ngate allows a count up to about 16379. isight_samples() then copies\ncount frames out of payload-\u003esamples into the PCM DMA buffer.\n\npayload-\u003esamples holds only 2 * MAX_FRAMES_PER_PACKET values. The\ndevice multiplexes two samples per frame. A count past\nMAX_FRAMES_PER_PACKET reads past the payload. A count past the buffer\nsize writes past runtime-\u003edma_area. The smallest PCM buffer is larger\nthan MAX_FRAMES_PER_PACKET. Bounding the count to MAX_FRAMES_PER_PACKET\nkeeps both the read and the write in range.\n\nA malicious or faulty Apple iSight on the FireWire bus reaches this\nduring a normal capture.\n\nAdd the MAX_FRAMES_PER_PACKET bound to the gate.","modified":"2026-07-27T04:02:41.250995395Z","published":"2026-07-25T08:51:43.851Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64483.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/24423e0a9251d348c3f1fb0bb0e61b879e1e976c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29b9667982e4df2ed7744f86b1144f8bb58eb698"},{"type":"WEB","url":"https://git.kernel.org/stable/c/31a01b70bb90e3ef3147f308e2ea899e1d2485ca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/31da82b9676c6b112e7c72c7529e6812b919742a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478"},{"type":"WEB","url":"https://git.kernel.org/stable/c/57e4d9043afc1eaddee8f50d11def6e65415d273"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8e48a29813df8dd71503800b7acf69c12c035045"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebbffacda6733dcbcef601b5b523460f8d8b671e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64483.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64483"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3a691b28a0ca3cf4d9010c6158318159e0275d2c"},{"fixed":"24423e0a9251d348c3f1fb0bb0e61b879e1e976c"},{"fixed":"ebbffacda6733dcbcef601b5b523460f8d8b671e"},{"fixed":"57e4d9043afc1eaddee8f50d11def6e65415d273"},{"fixed":"3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478"},{"fixed":"31da82b9676c6b112e7c72c7529e6812b919742a"},{"fixed":"8e48a29813df8dd71503800b7acf69c12c035045"},{"fixed":"31a01b70bb90e3ef3147f308e2ea899e1d2485ca"},{"fixed":"29b9667982e4df2ed7744f86b1144f8bb58eb698"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64483.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64483.json"}}],"schema_version":"1.7.5"}