CVE-2026-43427
usb: class: cdc-wdm: fix reordering issue in read code path
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 638328ca9c17ae6511ad62198c57bae32ffa3c91 (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 170e8daca24da6edb4be82ab01abf44e87af387b (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < c8fa96ed021923dae147bcd9f9205b8df7b82360 (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 4ee3062bf2c9a722afef429826e8607eaf3fc6a0 (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 276aef0fd2b92f41b920ac891c72cadeee957934 (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 67ed312124bb1b61858778ac0b985b48961c862a (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < e3c874b05901dc519054b5107d16620e6d2b5fea (affected, git) ≥ afba937e540c902c989cd516fd97ea0c8499bb27; < 8df672bfe3ec2268c2636584202755898e547173 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.26 (affected) ≥ 0; < 2.6.26 (unaffected, semver) ≥ 5.10.253; ≤ 5.10.* (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.167; ≤ 6.1.* (unaffected, semver) ≥ 6.6.130; ≤ 6.6.* (unaffected, semver) ≥ 6.12.78; ≤ 6.12.* (unaffected, semver) ≥ 6.18.19; ≤ 6.18.* (unaffected, semver) ≥ 6.19.9; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91CNA: Linux
- https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387bCNA: Linux
- https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360CNA: Linux
- https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0CNA: Linux
- https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934CNA: Linux
- https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862aCNA: Linux
- https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5feaCNA: Linux
- https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173CNA: Linux
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