{"id":"CVE-2026-64483","title":"ALSA: firewire: isight: bound the sample count to the packet payload","summary":"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 de…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 24423e0a9251d348c3f1fb0bb0e61b879e1e976c","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < ebbffacda6733dcbcef601b5b523460f8d8b671e","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 57e4d9043afc1eaddee8f50d11def6e65415d273","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31da82b9676c6b112e7c72c7529e6812b919742a","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 8e48a29813df8dd71503800b7acf69c12c035045","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31a01b70bb90e3ef3147f308e2ea899e1d2485ca","Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 29b9667982e4df2ed7744f86b1144f8bb58eb698","Linux 3.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:40:04.650665Z"},"published":"2026-07-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:55.003Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64483","references":[{"url":"https://git.kernel.org/stable/c/24423e0a9251d348c3f1fb0bb0e61b879e1e976c"},{"url":"https://git.kernel.org/stable/c/ebbffacda6733dcbcef601b5b523460f8d8b671e"},{"url":"https://git.kernel.org/stable/c/57e4d9043afc1eaddee8f50d11def6e65415d273"},{"url":"https://git.kernel.org/stable/c/3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478"},{"url":"https://git.kernel.org/stable/c/31da82b9676c6b112e7c72c7529e6812b919742a"},{"url":"https://git.kernel.org/stable/c/8e48a29813df8dd71503800b7acf69c12c035045"},{"url":"https://git.kernel.org/stable/c/31a01b70bb90e3ef3147f308e2ea899e1d2485ca"},{"url":"https://git.kernel.org/stable/c/29b9667982e4df2ed7744f86b1144f8bb58eb698"}],"tags":["cve.org"],"epss":0.00184,"epssPercentile":0.08085,"ingestedAt":"2026-11-06T16:57:43.163Z","slug":"CVE-2026-64483","body":"## Overview\n\nIn 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->sample_count);\n\tif (likely(count <= (length - 16) / 4))\n\t\tisight_samples(isight, payload->samples, 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->samples into the PCM DMA buffer.\n\npayload->samples 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->dma_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.\n\n## Affected\n\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 24423e0a9251d348c3f1fb0bb0e61b879e1e976c`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < ebbffacda6733dcbcef601b5b523460f8d8b671e`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 57e4d9043afc1eaddee8f50d11def6e65415d273`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31da82b9676c6b112e7c72c7529e6812b919742a`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 8e48a29813df8dd71503800b7acf69c12c035045`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 31a01b70bb90e3ef3147f308e2ea899e1d2485ca`\n- `Linux >= 3a691b28a0ca3cf4d9010c6158318159e0275d2c < 29b9667982e4df2ed7744f86b1144f8bb58eb698`\n- `Linux 3.0`\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":[]}