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CVE-2026-93808— ALSA: usb-audio: caiaq: validate EP1 reply lengths

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.

在 Linux 内核中，已修复以下漏洞： ALSA: usb-audio: caiaq：验证 EP1 响应长度 函数将 用作命令字节，随后从相同的 URB（USB 请求块）缓冲区中读取与命令相关的固定数据项。然而，在多个路径中，代码直接使用了 、 、 或 ，而未首先验证 是否确实包含这些字节。 本修复为每种命令类型添加了长度检查；对于控制状态拷贝操作，使用命令字节之后的字节派生的载荷长度；并在输入辅助函数读取 EP1 响应中的固定偏移量之前，拒绝过短的模拟输入载荷，从而防止越界访问。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 523f1dce37434a9a6623bf46e7893e2b4b10ac3c< 91acd231f219452fa58285239f83945accad9513 affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< 7cc6b3745a0cea697c8d0684b3094f220281a08d affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< add9328c91c195c494cd68a21b19e5e47a20d784 affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< 319393151367e6626affedcdd4f7b7b0286f4246 affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< af8a172c4f71ac30d625f2966d2389a7fa872819 affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< 74f3c639f64fa5da4e1613149798b5089bce2807 affected
523f1dce37434a9a6623bf46e7893e2b4b10ac3c< aba30af07d4fe499b50209801eba9da8a815522f affected
2.6.22 affected
… +8 more rows
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I. Basic Information for CVE-2026-93808

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: caiaq: validate EP1 reply lengths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: caiaq: validate EP1 reply lengths usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then reads command-specific fixed items from the same URB buffer. Several paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that urb->actual_length contains those bytes. Add per-command length checks, use a payload length derived from the bytes after the command byte for the control-state copy, and reject short analog input payloads before the input helper reads fixed offsets from the EP1 reply.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 523f1dce37434a9a6623bf46e7893e2b4b10ac3c ~ 91acd231f219452fa58285239f83945accad9513 -
Linux Linux 2.6.22 -

II. Public POCs for CVE-2026-93808

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III. Intelligence Information for CVE-2026-93808

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Patches & Fixes for CVE-2026-93808 (7)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93224 8.1 HIGH svcrdma: Fix unmatched rn_unregister on failed accept
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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