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CVE-2026-90033— ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_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.

在 Linux 内核中，以下漏洞已得到修复： ALSA: usb-audio: 修复 snd_usbmidi_us122l_output() 中的越界写入（OOB write） 函数对于任何低于高速（full speed 或更低）的设备，固定使用长度为 2 的计数，且该计数并未与 进行关联。由于 URB 缓冲区恰好持有 字节的内存，如果一个设备声明其批量端点仅支持 1 字节传输， 会取走 2 字节，随后用于填充剩余部分的 操作会以 类型计算 ，导致整型下溢（wrap）为 ，从而引发越界写入。 只有 PID 为 和

AI Predicted 7.8 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 030a07e441296c372f946cd4065b5d831d8dc40c< 5538daf2a5cc80ac3f3e913c0db045d92d995d40 affected
030a07e441296c372f946cd4065b5d831d8dc40c< a441a8e52148c91c2f2a91f42e3b9bc961a13a4b affected
030a07e441296c372f946cd4065b5d831d8dc40c< 2dae0e3a59e31f78222279d544b98e747cd1fbff affected
030a07e441296c372f946cd4065b5d831d8dc40c< 1d4add2b832b56f81bb0eab065ec35c610343018 affected
030a07e441296c372f946cd4065b5d831d8dc40c< de6d252f115be887a701c09a05cdb076f3a590c9 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 9392a2c346762ffee8edd1ba8bac50d2e24a2ed7 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 9d81885d97cba7796d1f8edc88f2499c8296f5b9 affected
030a07e441296c372f946cd4065b5d831d8dc40c< e4637ce34607f1733a34a57294966d26b263e626 affected
… +10 more rows
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I. Basic Information for CVE-2026-90033

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_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_us122l_output() The snd_usbmidi_us122l_output() picks a count of 2 on anything slower than high speed and never relates it to ep->max_transfer. The URB buffer holds exactly max_transfer bytes, so a device declaring a one byte bulk endpoint takes two bytes from snd_rawmidi_transmit(), and the memset that pads the rest computes 1 - 2 in int and wraps to SIZE_MAX. Only 0x800e and 0x800f are pinned to nine bytes. The US-122MKII at 0x0644:0x8021 falls to the default and takes usb_maxpacket(), which the USB core only clamps downward. The akai and novation output ops in this file were given the same guard recently. Do the same here.
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 030a07e441296c372f946cd4065b5d831d8dc40c ~ 5538daf2a5cc80ac3f3e913c0db045d92d995d40 -
Linux Linux 2.6.28 -

II. Public POCs for CVE-2026-90033

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III. Intelligence Information for CVE-2026-90033

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Other References for CVE-2026-90033 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89918 9.3 CRITICAL KVM: arm64: Correctly handle end of VA space TLBI invalidation

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90033

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