CVE-2026-64483
Low risk· EPSS 8%Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel's ALSA firewire isight driver, the sample count from the device packet is not bounded to MAX_FRAMES_PER_PACKET. A malicious or faulty Apple iSight device can send a packet with an excessive sample count, causing out-of-bounds read of the payload and out-of-bounds write of the PCM DMA buffer.
Risk Assessment
An attacker with FireWire bus access or a malicious device can trigger out-of-bounds memory access in the kernel, potentially leading to system crash or privilege escalation.
Recommendation
Apply the Linux kernel patch that bounds the sample count to MAX_FRAMES_PER_PACKET.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire: isight: bound the sample count to the packet payload isight_packet() takes the frame count from the device iso packet and checks it only against the device claimed iso length. count = be32_to_cpu(payload->sample_count); if (likely(count <= (length - 16) / 4)) isight_samples(isight, payload->samples, count); length is the iso header data_length. It can be up to 0xffff. So the gate allows a count up to about 16379. isight_samples() then copies count frames out of payload->samples into the PCM DMA buffer. payload->samples holds only 2 * MAX_FRAMES_PER_PACKET values. The device multiplexes two samples per frame. A count past MAX_FRAMES_PER_PACKET reads past the payload. A count past the buffer size writes past runtime->dma_area. The smallest PCM buffer is larger than MAX_FRAMES_PER_PACKET. Bounding the count to MAX_FRAMES_PER_PACKET keeps both the read and the write in range. A malicious or faulty Apple iSight on the FireWire bus reaches this during a normal capture. Add the MAX_FRAMES_PER_PACKET bound to the gate.