usb: class: cdc-wdm: fix reordering issue in read code path
Summary
| CVE | CVE-2026-43427 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:54 UTC |
| Updated | 2026-05-12 14:10:27 UTC |
| 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.067530000 (date 2026-05-12)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 638328ca9c17ae6511ad62198c57bae32ffa3c91 git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 170e8daca24da6edb4be82ab01abf44e87af387b git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 c8fa96ed021923dae147bcd9f9205b8df7b82360 git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 4ee3062bf2c9a722afef429826e8607eaf3fc6a0 git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 276aef0fd2b92f41b920ac891c72cadeee957934 git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 67ed312124bb1b61858778ac0b985b48961c862a git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 e3c874b05901dc519054b5107d16620e6d2b5fea git | Not specified |
| CNA | Linux | Linux | affected afba937e540c902c989cd516fd97ea0c8499bb27 8df672bfe3ec2268c2636584202755898e547173 git | Not specified |
| CNA | Linux | Linux | affected 2.6.26 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.26 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.167 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.