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CVE-2026-89735— usb: gadget: midi2: remove default configfs groups on teardown

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： USB: 设备（gadget）: midi2: 在拆卸时移除默认 configfs 组 通过 为默认端点和默认块创建默认的 configfs 子组，并将它们的内部引用计数设置为 1。 然而，在功能拆卸过程中的 或端点（EP）清理过程中的 中，从未调用 ，因此引用计数从未被递减，导致 和 发生内存泄漏。 在上述函数中添加缺失的 调用，以正确释放这些结构体。

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 8b645922b22303cec4628dbbbf6c8553d1cdec87< 4beda67ee72e0c8df5b49951dd8b96f6adb25e02 affected
8b645922b22303cec4628dbbbf6c8553d1cdec87< a15c2acd3083461f91725760e59dff88b33c28f6 affected
8b645922b22303cec4628dbbbf6c8553d1cdec87< 9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700 affected
8b645922b22303cec4628dbbbf6c8553d1cdec87< 0f6bffb5008f0cba9cad5ded2caccc64466a6e54 affected
6.6 affected
< 6.6 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89735

Vulnerability Information
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Vulnerability Title
usb: gadget: midi2: remove default configfs groups on teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: midi2: remove default configfs groups on teardown f_midi2_alloc_inst() creates default configfs child groups for the default endpoint and default block using configfs_add_default_group(), setting their internal refcount to 1. However, during function teardown in f_midi2_free_inst() or EP cleanup in f_midi2_ep_opts_release(), configfs_remove_default_groups() is never called, therefore never dropping the refcount and leaking struct f_midi2_ep_opts and f_midi2_block_opts. Add the missing configfs_remove_default_groups() in the afformentioned functions to free the structs properly.
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 8b645922b22303cec4628dbbbf6c8553d1cdec87 ~ 4beda67ee72e0c8df5b49951dd8b96f6adb25e02 -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-89735

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III. Intelligence Information for CVE-2026-89735

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Patches & Fixes for CVE-2026-89735 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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