UnratedFix available
usb: class: cdc-wdm: fix reordering issue in read code path
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.253, 5.15.203, 6.1.167, 6.12.78, 6.18.19, 6.19.9, 6.6.130
- CVEs
- CVE-2026-43427
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:36 UTC · Revision 1
Source evidence
usb: class: cdc-wdm: fix reordering issue in read code path
core-osv · Original sourcePublished 8 May 2026, 14:22 UTC
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.
osv:CVE-2026-43427
Kernel
Fixed versions: 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9
Complete source record
{
"id": "a34157c4ce5b1bd92bcc8848b78c9e4dbaeecaed328f7bea54e9075659c21070",
"url": "https://osv.dev/vulnerability/CVE-2026-43427",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "usb: class: cdc-wdm: fix reordering issue in read code path",
"summary": "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.",
"evidence": "osv:CVE-2026-43427",
"products": [
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{
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"package": {
"name": "Kernel",
"ecosystem": "Linux"
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"database_specific": {
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],
"modified": "2026-10-28T02:30:31.003609866Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b",
"https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934",
"https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0",
"https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91",
"https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a",
"https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173",
"https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360",
"https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43427.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-43427",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43427.json"
}
},
"related_cves": [
{
"value": "CVE-2026-43427",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 497907,
"published_at": "2026-05-08T14:22:00.345+00:00"
}