Answer in brief
CVE-2026-43427 records a Unknown severity vulnerability in usb: class: cdc-wdm: fix reordering issue in read code path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=afba937e540c902c989cd516fd97ea0c8499bb27 <638328ca9c17ae6511ad62198c57bae32ffa3c91 || >=afba937e540c902c989cd516fd97ea0c8499bb27 <170e8daca24da6edb4be82ab01abf44e87af387b || >=afba937e540c902c989cd516fd97ea0c8499bb27 <c8fa96ed021923dae147bcd9f9205b8df7b82360 || >=afba937e540c902c989cd516fd97ea0c8499bb27 <4ee3062bf2c9a722afef429826e8607eaf3fc6a0 || >=afba937e540c902c989cd516fd97ea0c8499bb27 <276aef0fd2b92f41b920ac891c72cadeee957934 || >=afba937e540c902c989cd516fd97ea0c8499bb27 <67ed312124bb1b61858778ac0b985b48961c862a || >=afba937e540c902c989cd516fd97ea0c8499bb27 <e3c874b05901dc519054b5107d16620e6d2b5fea || >=afba937e540c902c989cd516fd97ea0c8499bb27 <8df672bfe3ec2268c2636584202755898e547173 | 638328ca9c17ae6511ad62198c57bae32ffa3c91, 170e8daca24da6edb4be82ab01abf44e87af387b, c8fa96ed021923dae147bcd9f9205b8df7b82360, 4ee3062bf2c9a722afef429826e8607eaf3fc6a0, 276aef0fd2b92f41b920ac891c72cadeee957934, 67ed312124bb1b61858778ac0b985b48961c862a, e3c874b05901dc519054b5107d16620e6d2b5fea, 8df672bfe3ec2268c2636584202755898e547173 |
| Linux/Linuxgeneric | 2.6.26 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
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.
Quoted source text, attributed separately from HOL analysis.