VulnerabilityPublished 8 May 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e3c874b05901dc519054b5107d16620e6d2b5fea : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in e3c874b05901dc519054b5107d16620e6d2b5fea, c8fa96ed021923dae147bcd9f9205b8df7b82360, 638328ca9c17ae6511ad62198c57bae32ffa3c91 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 8 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < e3c874b05901dc519054b5107d16620e6d2b5fea	Fixed in e3c874b05901dc519054b5107d16620e6d2b5fea
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < c8fa96ed021923dae147bcd9f9205b8df7b82360	Fixed in c8fa96ed021923dae147bcd9f9205b8df7b82360
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < 638328ca9c17ae6511ad62198c57bae32ffa3c91	Fixed in 638328ca9c17ae6511ad62198c57bae32ffa3c91
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < 276aef0fd2b92f41b920ac891c72cadeee957934	Fixed in 276aef0fd2b92f41b920ac891c72cadeee957934
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < 170e8daca24da6edb4be82ab01abf44e87af387b	Fixed in 170e8daca24da6edb4be82ab01abf44e87af387b
LinuxLinux	Affected ≥ afba937e540c902c989cd516fd97ea0c8499bb27, < 67ed312124bb1b61858778ac0b985b48961c862a	Fixed in 67ed312124bb1b61858778ac0b985b48961c862a

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.

References

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