{"api_version":"1","generated_at":"2026-08-24T20:08:14+00:00","cve":"CVE-2026-72483","urls":{"html":"https://cve.report/CVE-2026-72483","api":"https://cve.report/api/cve/CVE-2026-72483.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72483","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72483"},"summary":{"title":"usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:22","updated_at":"2026-08-17 06:19:16"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","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","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","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","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517","name":"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4","name":"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54","name":"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5","name":"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af","name":"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237","name":"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30","name":"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4","name":"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72483","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72483","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d53139f31626bad6f8983d8e519ddde2cbba921 e5fa9d8f40746ec3447335c9642c03410f5fd3af git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d53139f31626bad6f8983d8e519ddde2cbba921 08b1d4cab0230697bc74c63fc4e40170a7559c54 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d53139f31626bad6f8983d8e519ddde2cbba921 3be5f24e8270ba53b3c814d13689bb8644c86237 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2d53139f31626bad6f8983d8e519ddde2cbba921 d512bdefd241b98f4d7bcb5bab5614a86411fad4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72483","cve":"CVE-2026-72483","epss":"0.001810000","percentile":"0.079810000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/host/max3421-hcd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e5fa9d8f40746ec3447335c9642c03410f5fd3af","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"08b1d4cab0230697bc74c63fc4e40170a7559c54","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"3be5f24e8270ba53b3c814d13689bb8644c86237","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"d512bdefd241b98f4d7bcb5bab5614a86411fad4","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"00dd025324b56d39d37e57a08f473dab3a660f30","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"02d03c61e8a7b016956acb48e8a2512d16d87517","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"4da073d57176d8e1c2bca34febfbc81d2560c1a5","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"},{"lessThan":"cff06b03b530ae1fe8a13e93a7848f2130e00fb4","status":"affected","version":"2d53139f31626bad6f8983d8e519ddde2cbba921","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/host/max3421-hcd.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.16"},{"lessThan":"3.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached when a local process issues USBDEVFS_CONTROL on the MAX3421 root hub (/dev/bus/usb/BBB/001); usb_submit_urb() routes ep0 control transfers through rh_call_control() to max3421_hub_control(), with no network or remote protocol path.\nAC:L - The attacker fully controls the hub-class wValue field in the ioctl and can reliably trigger the shift-out-of-bounds by sending SetPortFeature or ClearPortFeature with wValue>=32; no race, timing, or memory-layout conditions outside the attacker's control are required.\nPR:L - Only a basic unprivileged local account is needed: desktop, kiosk, and embedded MAX3421 deployments grant USB bus device-node access via udev uaccess/ACL or plugdev, and check_ctrlrecip() imposes no extra capability check for hub-class (USB_RECIP_OTHER) root-hub requests.\nUI:N - Exploitation is self-contained in the attacker's own process issuing the crafted USBDEVFS_CONTROL ioctl; no separate victim action, mount, or file open by another user is required.\nS:U - The undefined-behavior shift corrupts only the MAX3421 driver's port_status state inside kernel memory under the same security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Shift-out-of-bounds on port_status is kernel memory corruption of a security-relevant hub state word; corrupted status (including normally kernel-only change bits) is returned to userspace via GetPortStatus, enabling information disclosure from corrupted kernel state.\nI:H - The unchecked shift allows arbitrary bit manipulation of port_status, including normally immutable change bits, bypassing the USB_PORT_STAT_POWER gate that guards SetPortFeature updates and corrupting hub state that drives VBUS control and port reset logic.\nA:H - Shift-out-of-bounds is undefined behavior that can trap under UBSAN/KASAN or panic_on_warn, and corrupting port_status can confuse hub status polling, suspend/resume, and port-reset handling, causing USB host failure or kernel hang on embedded MAX3421 systems."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:44:46.745Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af"},{"url":"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54"},{"url":"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237"},{"url":"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4"},{"url":"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30"},{"url":"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517"},{"url":"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5"},{"url":"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4"}],"title":"usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72483","datePublished":"2026-08-15T05:57:20.914Z","dateReserved":"2026-08-09T03:40:39.935Z","dateUpdated":"2026-08-17T05:44:46.745Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:22","lastModifiedDate":"2026-08-17 06:19:16","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72483","Ordinal":"1","Title":"usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_contr","CVE":"CVE-2026-72483","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72483","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_contr"}]}}}