CVE-2026-64483
Received Received - Intake

Buffer Overflow in Linux Kernel ALSA FireWire iSight Driver

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
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.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-08-14
AI Q&A
2026-07-25
EPSS Evaluated
2026-08-13
NVD
CVE-2026-64483
EUVD
EUVD-2026-48827

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apple isight *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the ALSA firewire isight driver. The issue occurs in the isight_packet() function, which processes audio frames from an Apple iSight camera connected via FireWire. The function reads a frame count from the device's ISO packet but only validates it against the packet's length, not the actual buffer size. This allows a malicious or faulty device to provide a frame count that exceeds the buffer's capacity, leading to out-of-bounds memory reads and writes.

Detection Guidance

This vulnerability is specific to the Linux kernel's ALSA firewire isight driver and requires physical access to an Apple iSight FireWire camera. Detection involves checking kernel logs for buffer overflow warnings or monitoring FireWire bus activity for malformed packets from the device. No network detection commands are applicable.

Impact Analysis

If exploited, this vulnerability could allow an attacker with access to the FireWire bus to cause a denial-of-service condition by crashing the system or potentially execute arbitrary code with kernel privileges. It may also lead to memory corruption or privilege escalation if the system is compromised.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a local memory corruption issue in the Linux kernel's ALSA firewire driver for Apple iSight devices, which could lead to system instability or crashes but does not involve data exposure or privacy violations.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for this vulnerability. Disable the isight firewire driver if not needed. Physically disconnect any untrusted Apple iSight devices from FireWire ports until patched.

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