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CVE-2026-90020— USB: gadget: fix NULL pointer dereference in gadget_dev_ioctl()

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 子系统（gadget）：修复 gadget_dev_ioctl() 函数中的空指针解引用问题 gadget_dev_ioctl() 函数在获取 dev->lock 之前读取了 dev->gadget，但直到获取锁之后才检查 dev->state。因此，并发执行的 bind 操作可能在上述两个操作之间改变设备状态，导致 ioctl 路径中持有一个过期的 NULL gadget 指针，进而在调用 gadget->ops->ioctl 时引发空指针解引用。 修复方法是：在

AI Predicted 5.5 Difficulty: Hard EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1518 · Software Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8be30959be31b4205e3bdd2e2a6221f3a2ee7ea1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e8219accce2f6d3502ed71f5b5e854ecf27249a6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 87cbf9410b12f5c2d659bb01e8ecf6517cb9f28c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 162178ca83c3de986900385a0477eb539f8e1a7e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ebd916fdfefaacbc0e577f7037ec96b31a105e5f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c29a83c1ff3f06d5751f6d365b606c9f81ccc4cb affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 64ec019bf9a8b12f53b9f2777d65aadb730b5a84 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< dd0eed9e165b1a6292f49e622e3dd0b7d99b106d affected
… +10 more rows
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I. Basic Information for CVE-2026-90020

Vulnerability Information
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Vulnerability Title
USB: gadget: fix NULL pointer dereference in gadget_dev_ioctl()
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 gadget_dev_ioctl() gadget_dev_ioctl() reads dev->gadget before acquiring dev->lock, but dev->state is checked after acquiring the lock. Therefore a concurrent bind can change the device state between these operations, which can leave ioctl with a stale NULL gadget pointer and causing a NULL pointer dereference at gadget->ops->ioctl. Read dev->gadget while holding dev->lock so that the gadget pointer and device state are sampled consistently.
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 8be30959be31b4205e3bdd2e2a6221f3a2ee7ea1 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-90020

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III. Intelligence Information for CVE-2026-90020

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Other References for CVE-2026-90020 (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

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