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CVE-2026-43427— usb: class: cdc-wdm: fix reordering issue in read code path

AI Predicted 7.8 Difficulty: Hard EPSS 0.13% · P3

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxafba937e540c902c989cd516fd97ea0c8499bb27< 638328ca9c17ae6511ad62198c57bae32ffa3c91affected
afba937e540c902c989cd516fd97ea0c8499bb27< 170e8daca24da6edb4be82ab01abf44e87af387baffected
afba937e540c902c989cd516fd97ea0c8499bb27< c8fa96ed021923dae147bcd9f9205b8df7b82360affected
afba937e540c902c989cd516fd97ea0c8499bb27< 4ee3062bf2c9a722afef429826e8607eaf3fc6a0affected
afba937e540c902c989cd516fd97ea0c8499bb27< 276aef0fd2b92f41b920ac891c72cadeee957934affected
afba937e540c902c989cd516fd97ea0c8499bb27< 67ed312124bb1b61858778ac0b985b48961c862aaffected
afba937e540c902c989cd516fd97ea0c8499bb27< e3c874b05901dc519054b5107d16620e6d2b5feaaffected
afba937e540c902c989cd516fd97ea0c8499bb27< 8df672bfe3ec2268c2636584202755898e547173affected
… +10 more rows
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I. Basic Information for CVE-2026-43427

Vulnerability Information
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Vulnerability Title
usb: class: cdc-wdm: fix reordering issue in read code path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于usb class cdc-wdm驱动在读取代码路径中desc->length更新可能被重排序，导致读取未初始化内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux afba937e540c902c989cd516fd97ea0c8499bb27 ~ 638328ca9c17ae6511ad62198c57bae32ffa3c91 -
LinuxLinux 2.6.26 -

II. Public POCs for CVE-2026-43427

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III. Intelligence Information for CVE-2026-43427

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Patches & Fixes for CVE-2026-43427 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-433769.8 CRITICALksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-433789.8 CRITICALsmb: server: fix use-after-free in smb2_open()
CVE-2026-433799.8 CRITICALksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-433419.8 CRITICALnet/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-434149.8 CRITICALscsi: qla2xxx: Completely fix fcport double free
CVE-2026-433049.8 CRITICALlibceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-434029.8 CRITICALkthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-433849.8 CRITICALnet/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-434659.8 CRITICALnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-433839.4 CRITICALnet/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-434079.1 CRITICALlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-434069.1 CRITICALlibceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-433348.8 HIGHBluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-432848.8 HIGHxfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-434038.8 HIGHnsfs: tighten permission checks for ns iteration ioctls
CVE-2026-433918.8 HIGHnsfs: tighten permission checks for handle opening
CVE-2026-433228.8 HIGHBluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-432918.3 HIGHnet: nfc: nci: Fix parameter validation for packet data
CVE-2026-434668.2 HIGHnet/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-434528.2 HIGHnetfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43427

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