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CVE-2026-90019— usb: gadget: fix null pointer dereference in usb_put_function_instance()

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: 修复 usb_put_function_instance() 中的空指针解引用问题 在 uvc_alloc_inst() 的错误处理路径中，usb_put_function_instance() 尝试解引用 fi 结构体中的 fd 指针以获取 mod。然而，fd 是在 uvc_alloc_inst() 中分配 fi 之后，在 try_get_usb_function_instance() 函数中才进行分配的，因此在错误处理路径中 fd 必然为

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 0fc54a00954f9f4c3e3d4ffa64a530685d99a39b affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 6e6736c049683380f5e20becde498986e9293ca4 affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 3a9691fff79bcce95338435599df6d3ae433cfdc affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 7a4f4ca7ff32ae24807c83e2a06d62b13378d53c affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 6ea3a073ca97716d4a73df49a3bec1c3ccf8e2a0 affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< d3a7fa61997db3bf6dadef4c1bd87a4fa782a817 affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 5117f236e9e30744338b425395d55913c4500897 affected
0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2< 6e74ac5c596fd246e37eadfc354567179ccbe9aa affected
… +10 more rows
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I. Basic Information for CVE-2026-90019

Vulnerability Information
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Vulnerability Title
usb: gadget: fix null pointer dereference in usb_put_function_instance()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: fix null pointer dereference in usb_put_function_instance() usb_put_function_instance() attempts to dereference fd inside fi struct to get mod in uvc_alloc_inst() error path. However, fd is not allocated until later in try_get_usb_function_instance() after allocating fi in uvc_alloc_inst() and thus guranteed to be null in error path. Fix this by adding a null check for fi->fd that returns if fd is null.
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 0062f6e56f70bd2230ba1ebd1667d1b32a1af3b2 ~ 0fc54a00954f9f4c3e3d4ffa64a530685d99a39b -
Linux Linux 3.9 -

II. Public POCs for CVE-2026-90019

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III. Intelligence Information for CVE-2026-90019

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Other References for CVE-2026-90019 (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-2026-90019

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