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CVE-2026-64483— ALSA: firewire: isight: bound the sample count to the packet payload

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.0版本存在安全漏洞，该漏洞源于isight_packet函数中样本计数未正确绑定到MAX_FRAMES_PER_PACKET，可能导致越界读取或写入。

AI Predicted 6.5 Difficulty: Theoretical EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3a691b28a0ca3cf4d9010c6158318159e0275d2c< 24423e0a9251d348c3f1fb0bb0e61b879e1e976c affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< ebbffacda6733dcbcef601b5b523460f8d8b671e affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 57e4d9043afc1eaddee8f50d11def6e65415d273 affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478 affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 31da82b9676c6b112e7c72c7529e6812b919742a affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 8e48a29813df8dd71503800b7acf69c12c035045 affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 31a01b70bb90e3ef3147f308e2ea899e1d2485ca affected
3a691b28a0ca3cf4d9010c6158318159e0275d2c< 29b9667982e4df2ed7744f86b1144f8bb58eb698 affected
… +10 more rows
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I. Basic Information for CVE-2026-64483

Vulnerability Information
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Vulnerability Title
ALSA: firewire: isight: bound the sample count to the packet payload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.0版本存在安全漏洞，该漏洞源于isight_packet函数中样本计数未正确绑定到MAX_FRAMES_PER_PACKET，可能导致越界读取或写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3a691b28a0ca3cf4d9010c6158318159e0275d2c ~ 24423e0a9251d348c3f1fb0bb0e61b879e1e976c -
Linux Linux 3.0 -

II. Public POCs for CVE-2026-64483

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III. Intelligence Information for CVE-2026-64483

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Patches & Fixes for CVE-2026-64483 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64483

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