{"api_version":"1","generated_at":"2026-05-13T07:41:43+00:00","cve":"CVE-2026-43427","urls":{"html":"https://cve.report/CVE-2026-43427","api":"https://cve.report/api/cve/CVE-2026-43427.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43427","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43427"},"summary":{"title":"usb: class: cdc-wdm: fix reordering issue in read code path","description":"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->length 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:54","updated_at":"2026-05-12 14:10:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360","name":"https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea","name":"https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173","name":"https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934","name":"https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a","name":"https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91","name":"https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b","name":"https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0","name":"https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43427","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43427","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 638328ca9c17ae6511ad62198c57bae32ffa3c91 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 170e8daca24da6edb4be82ab01abf44e87af387b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 c8fa96ed021923dae147bcd9f9205b8df7b82360 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 4ee3062bf2c9a722afef429826e8607eaf3fc6a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 276aef0fd2b92f41b920ac891c72cadeee957934 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 67ed312124bb1b61858778ac0b985b48961c862a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 e3c874b05901dc519054b5107d16620e6d2b5fea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected afba937e540c902c989cd516fd97ea0c8499bb27 8df672bfe3ec2268c2636584202755898e547173 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.26","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.26 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.253 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43427","cve":"CVE-2026-43427","epss":"0.000240000","percentile":"0.067530000","score_date":"2026-05-12","updated_at":"2026-05-13 00:11:53"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/class/cdc-wdm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"638328ca9c17ae6511ad62198c57bae32ffa3c91","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"170e8daca24da6edb4be82ab01abf44e87af387b","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"c8fa96ed021923dae147bcd9f9205b8df7b82360","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"4ee3062bf2c9a722afef429826e8607eaf3fc6a0","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"276aef0fd2b92f41b920ac891c72cadeee957934","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"67ed312124bb1b61858778ac0b985b48961c862a","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"e3c874b05901dc519054b5107d16620e6d2b5fea","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"},{"lessThan":"8df672bfe3ec2268c2636584202755898e547173","status":"affected","version":"afba937e540c902c989cd516fd97ea0c8499bb27","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/class/cdc-wdm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.26"},{"lessThan":"2.6.26","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"2.6.26","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.26","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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->length 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."}],"providerMetadata":{"dateUpdated":"2026-05-11T22:24:22.781Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91"},{"url":"https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b"},{"url":"https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360"},{"url":"https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0"},{"url":"https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934"},{"url":"https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a"},{"url":"https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea"},{"url":"https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173"}],"title":"usb: class: cdc-wdm: fix reordering issue in read code path","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43427","datePublished":"2026-05-08T14:22:00.345Z","dateReserved":"2026-05-01T14:12:56.009Z","dateUpdated":"2026-05-11T22:24:22.781Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:54","lastModifiedDate":"2026-05-12 14:10:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43427","Ordinal":"1","Title":"usb: class: cdc-wdm: fix reordering issue in read code path","CVE":"CVE-2026-43427","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43427","Ordinal":"1","NoteData":"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->length 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.","Type":"Description","Title":"usb: class: cdc-wdm: fix reordering issue in read code path"}]}}}