{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43427", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.009Z", "datePublished": "2026-05-08T14:22:00.345Z", "dateUpdated": "2026-05-08T14:22:00.345Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-08T14:22:00.345Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/class/cdc-wdm.c"], "versions": [{"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "638328ca9c17ae6511ad62198c57bae32ffa3c91", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "170e8daca24da6edb4be82ab01abf44e87af387b", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "c8fa96ed021923dae147bcd9f9205b8df7b82360", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "4ee3062bf2c9a722afef429826e8607eaf3fc6a0", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "276aef0fd2b92f41b920ac891c72cadeee957934", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "67ed312124bb1b61858778ac0b985b48961c862a", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "e3c874b05901dc519054b5107d16620e6d2b5fea", "status": "affected", "versionType": "git"}, {"version": "afba937e540c902c989cd516fd97ea0c8499bb27", "lessThan": "8df672bfe3ec2268c2636584202755898e547173", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/class/cdc-wdm.c"], "versions": [{"version": "2.6.26", "status": "affected"}, {"version": "0", "lessThan": "2.6.26", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.0"}]}]}], "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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-43427", "lastModified": "2026-05-08T15:16:54.867", "metrics": {}, "published": "2026-05-08T15:16:54.867", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: usb: class: cdc-wdm: fix reordering issue in read code path", "id": "2468232", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468232"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's USB CDC WDM driver. Due to compiler optimizations or CPU out-of-order execution, a memory reordering issue can occur during the read operation. This can lead to the driver accessing uninitialized memory, potentially resulting in information disclosure to a local attacker."], "name": "CVE-2026-43427", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43427\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43427\nhttps://lore.kernel.org/linux-cve-announce/2026050849-CVE-2026-43427-12cc@gregkh/T"], "threat_severity": "Moderate"}

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