{"id":"CVE-2026-72483","summary":"usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()\n\nThe `max3421_hub_control()` function handles USB hub class requests\nto the virtual root hub. In the `default` branches of both the\n`ClearPortFeature` and `SetPortFeature` switch statements, it modifies\n`max3421_hcd-\u003eport_status` by left shifting 1 by the request's `value`\nparameter. However, it does not validate whether this shift will exceed\nthe width of `port_status`.\n\nSo if a malicious userspace task with access to the root hub via\n/dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue`\ngreater than or equal to 32, the left shift operation invokes\nshift-out-of-bounds undefined behavior. This results in arbitrary\nbit corruption of `port_status`, including the normally-immutable\nchange bits, which can bypass internal state checks and confuse the\nhub status.\n\nFix this by rejecting requests whose `value` exceeds the shift width\nbefore performing the shift.\n\nThis issue was found using a KLEE-based symbolic execution tool for\nkernel drivers that I'm currently developing.","modified":"2026-08-18T03:56:43.798529602Z","published":"2026-08-15T05:57:20.914Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72483.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517"},{"type":"WEB","url":"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72483.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72483"},{"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":"2d53139f31626bad6f8983d8e519ddde2cbba921"},{"fixed":"e5fa9d8f40746ec3447335c9642c03410f5fd3af"},{"fixed":"08b1d4cab0230697bc74c63fc4e40170a7559c54"},{"fixed":"3be5f24e8270ba53b3c814d13689bb8644c86237"},{"fixed":"d512bdefd241b98f4d7bcb5bab5614a86411fad4"},{"fixed":"00dd025324b56d39d37e57a08f473dab3a660f30"},{"fixed":"02d03c61e8a7b016956acb48e8a2512d16d87517"},{"fixed":"4da073d57176d8e1c2bca34febfbc81d2560c1a5"},{"fixed":"cff06b03b530ae1fe8a13e93a7848f2130e00fb4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72483.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.16.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72483.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}