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CVE-2026-74499— ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于snd_usbmidi_akai_output函数边界计算不当，可能导致攻击者触发堆越界写入。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4434ade8c9334a3ab975d8993de456f06841899e< 78dfdeb8d2065524ed5928d6470bf3d3244d1009 affected
4434ade8c9334a3ab975d8993de456f06841899e< 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8 affected
4434ade8c9334a3ab975d8993de456f06841899e< ce949d66607cfb000b8d8d84f80f35a886e72683 affected
4434ade8c9334a3ab975d8993de456f06841899e< 29a4c29943631301e85f5e9d10f25741bd78e7ba affected
4434ade8c9334a3ab975d8993de456f06841899e< 9b22a5c8310b0d55d04f5f0159b913a2fb8b444f affected
4434ade8c9334a3ab975d8993de456f06841899e< b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081 affected
4434ade8c9334a3ab975d8993de456f06841899e< 2b7a0f330dd90dd1a7657cec0db019ee1efa4372 affected
4434ade8c9334a3ab975d8993de456f06841899e< 0970274613fb463d376211450cab066d34ebfe6a affected
… +10 more rows
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I. Basic Information for CVE-2026-74499

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() snd_usbmidi_akai_output() computes its fill-loop bound buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1; as a signed int, so a small device-advertised bulk-OUT max_transfer makes buf_end negative. The loop guard then compares the u32 urb->transfer_buffer_length against that negative int: the usual arithmetic conversion turns buf_end into a large unsigned value, so the guard stays true and each iteration keeps appending SysEx framing and payload bytes past the end of the URB transfer buffer, which is only max_transfer bytes long. A USB device that advertises a tiny bulk-OUT endpoint can therefore trigger an attacker-length- and content-controlled heap out-of-bounds write when a process writes to the created /dev/snd/midiC*D* node. Return early when there is no room for even one SysEx, so the loop is never entered with a bound that would wrap. The loop is the last statement of the function, so bailing out is equivalent to it not running. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于snd_usbmidi_akai_output函数边界计算不当，可能导致攻击者触发堆越界写入。
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 4434ade8c9334a3ab975d8993de456f06841899e ~ 78dfdeb8d2065524ed5928d6470bf3d3244d1009 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2026-74499

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III. Intelligence Information for CVE-2026-74499

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Patches & Fixes for CVE-2026-74499 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74499

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