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CVE-2026-90021— usb: gadget: f_midi: initialize work in f_midi_alloc()

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： usb: gadget: f_midi: 在 f_midi_alloc() 中初始化 work f_midi_alloc 将 free_ref 初始化为 1，该值仅在通过 f_midi_register_card() 注册声卡时才会递增。而 f_midi_register_card() 仅在 f_midi_bind() 中被调用，而 f_midi_bind() 中实际执行了 INIT_WORK。如果 f_midi_bind() 从未执行，work 未被初始化，导致 f_

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1579

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 8653d71ce3763aedcf3d2331f59beda3fecd79e4< 3d8b11255e632170f32f1925bfcaf96331f36317 affected
8653d71ce3763aedcf3d2331f59beda3fecd79e4< 02ac76f27db23ef652358458c272d9d2d6f51167 affected
8653d71ce3763aedcf3d2331f59beda3fecd79e4< 858576de6b2f5166b08dae803f0fd0766dcb3002 affected
8653d71ce3763aedcf3d2331f59beda3fecd79e4< 7e07d3e4c389217d7d7171d80edf2e23ac70f1ea affected
89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d affected
3635523e9b96213969693c320302d536774d8e9b affected
5.4.291< 5.5 affected
5.10.235< 5.11 affected
… +6 more rows
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I. Basic Information for CVE-2026-90021

Vulnerability Information
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Vulnerability Title
usb: gadget: f_midi: initialize work in f_midi_alloc()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: initialize work in f_midi_alloc() f_midi_alloc initializes free_ref to 1 and it can only be incremented when a sound card is registered via f_midi_register_card(). f_midi_register_card() is only called in f_midi_bind() which actually performs INIT_WORK. If f_midi_bind() is never run, work is not initialized and the if condition in f_midi_free becomes true, this results in a warning later in __flush_work as work->func = 0. Fix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().
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 8653d71ce3763aedcf3d2331f59beda3fecd79e4 ~ 3d8b11255e632170f32f1925bfcaf96331f36317 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-90021

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III. Intelligence Information for CVE-2026-90021

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Other References for CVE-2026-90021 (4)

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

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