{"id":"CVE-2026-43427","summary":"usb: class: cdc-wdm: fix reordering issue in read code path","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: class: cdc-wdm: fix reordering issue in read code path\n\nQuoting the bug report:\n\nDue to compiler optimization or CPU out-of-order execution, the\ndesc-\u003elength update can be reordered before the memmove. If this\nhappens, wdm_read() can see the new length and call copy_to_user() on\nuninitialized memory. This also violates LKMM data race rules [1].\n\nFix it by using WRITE_ONCE and memory barriers.","modified":"2026-05-28T03:55:42.388315039Z","published":"2026-05-08T14:22:00.345Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43427.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43427.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43427"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"afba937e540c902c989cd516fd97ea0c8499bb27"},{"fixed":"638328ca9c17ae6511ad62198c57bae32ffa3c91"},{"fixed":"170e8daca24da6edb4be82ab01abf44e87af387b"},{"fixed":"c8fa96ed021923dae147bcd9f9205b8df7b82360"},{"fixed":"4ee3062bf2c9a722afef429826e8607eaf3fc6a0"},{"fixed":"276aef0fd2b92f41b920ac891c72cadeee957934"},{"fixed":"67ed312124bb1b61858778ac0b985b48961c862a"},{"fixed":"e3c874b05901dc519054b5107d16620e6d2b5fea"},{"fixed":"8df672bfe3ec2268c2636584202755898e547173"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43427.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.26"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43427.json"}}],"schema_version":"1.7.5"}