{"id":"CVE-2026-72483","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-72483","generatedAt":"2026-10-28T01:19:42.057Z","title":"In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control() The `max3421_hub_control()` function handles USB hub class requests to the virtual root hub.","description":"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->port_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.","published":"2026-08-15T06:22:23.000Z","lastModified":"2026-08-17T06:19:16.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":[],"epss":{"score":0.00194,"percentile":0.09048,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72483","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}