{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-31607", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31607", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-04-24T14:42:29.468Z", "updatedAt": "2026-10-19T18:56:00.074Z", "importedAt": "2026-10-24T01:58:02.025Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "usbip: validate number_of_packets in usbip_pack_ret_submit()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: validate number_of_packets in usbip_pack_ret_submit()\n\nWhen a USB/IP client receives a RET_SUBMIT response,\nusbip_pack_ret_submit() unconditionally overwrites\nurb->number_of_packets from the network PDU. This value is\nsubsequently used as the loop bound in usbip_recv_iso() and\nusbip_pad_iso() to iterate over urb->iso_frame_desc[], a flexible\narray whose size was fixed at URB allocation time based on the\n*original* number_of_packets from the CMD_SUBMIT.\n\nA malicious USB/IP server can set number_of_packets in the response\nto a value larger than what was originally submitted, causing a heap\nout-of-bounds write when usbip_recv_iso() writes to\nurb->iso_frame_desc[i] beyond the allocated region.\n\nKASAN confirmed this with kernel 7.0.0-rc5:\n\n BUG: KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640\n Write of size 4 at addr ffff888106351d40 by task vhci_rx/69\n\n The buggy address is located 0 bytes to the right of\n allocated 320-byte region [ffff888106351c00, ffff888106351d40)\n\nThe server side (stub_rx.c) and gadget side (vudc_rx.c) already\nvalidate number_of_packets in the CMD_SUBMIT path since commits\nc6688ef9f297 (\"usbip: fix stub_rx: harden CMD_SUBMIT path to handle\nmalicious input\") and b78d830f0049 (\"usbip: fix vudc_rx: harden\nCMD_SUBMIT path to handle malicious input\"). The server side validates\nagainst USBIP_MAX_ISO_PACKETS because no URB exists yet at that point.\nOn the client side we have the original URB, so we can use the tighter\nbound: the response must not exceed the original number_of_packets.\n\nThis mirrors the existing validation of actual_length against\ntransfer_buffer_length in usbip_recv_xbuff(), which checks the\nresponse value against the original allocation size.\n\nKelvin Mbogo's series (\"usb: usbip: fix integer overflow in\nusbip_recv_iso()\", v2) hardens the receive-side functions themselves;\nthis patch complements that work by catching the bad value at its\nsource -- in usbip_pack_ret_submit() before the overwrite -- and\nusing the tighter per-URB allocation bound rather than the global\nUSBIP_MAX_ISO_PACKETS limit.\n\nFix this by checking rpdu->number_of_packets against\nurb->number_of_packets in usbip_pack_ret_submit() before the\noverwrite. On violation, clamp to zero so that usbip_recv_iso() and\nusbip_pad_iso() safely return early.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "324262c38438255bf6bdbf6342ca47c0badaab76" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "973f2c250289f5bf6cc146b98aa6fdde11fe50d6" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "ce744264b06b97069b3722511ab355738311fee0" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "885c8591784da6314f9aa82fa460ac69f9f79e5f" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "8d155e2d1c4102f74f82a2bf9c016164bb0f7384" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "906f16a836de13fe61f49cdce2f66f2dbd14caf4" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "ef8ebb1c637b4cfb61a9dd2e013376774ee2033b" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "5e1c4ece08ccdc197177631f111845a2c68eede3" }, { "version": "1325f85fa49f57df034869de430f7c302ae23109", "status": "affected", "versionType": "git", "lessThan": "2ab833a16a825373aad2ba7d54b572b277e95b71" }, { "version": "d9638d9236eed035a575feddec61d036dacc2676", "status": "affected", "versionType": "git" }, { "version": "ca7d3501b7a287c18b5b470e871d3029b0f4842a", "status": "affected", "versionType": "git" }, { "version": "1ce528277e1a66856ed3f7526c1e3458c0ed4a70", "status": "affected", "versionType": "git" }, { "version": "db898d0c5c493ce4177d5e1d3a953e079a56a24b", "status": "affected", "versionType": "git" }, { "version": "5aa02704b9ee67c5b2ee26d54c5f4eb99e93ba9a", "status": "affected", "versionType": "git" }, { "version": "2.6.32.37", "status": "affected", "versionType": "semver", "lessThan": "2.6.33" }, { "version": "2.6.33.10", "status": "affected", "versionType": "semver", "lessThan": "2.6.34" }, { "version": "2.6.34.11", "status": "affected", "versionType": "semver", "lessThan": "2.6.35" }, { "version": "2.6.35.13", "status": "affected", "versionType": "semver", "lessThan": "2.6.36" }, { "version": "2.6.38.3", "status": "affected", "versionType": "semver", "lessThan": "2.6.39" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.39", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.39" }, { "version": "5.10.258", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.209", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.136", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.83", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.24", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }