{"id":"CVE-2026-31607","revision":"10a4037e687e447b98f12f29127d7813","records":[{"revision":"10a4037e687e447b98f12f29127d7813","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31607","aliases":[],"title":"usbip: validate number_of_packets in usbip_pack_ret_submit()","description":"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.","state":0,"publishedAt":"2026-04-24T14:42:29.468+00:00","modifiedAt":"2026-10-19T18:56:00.074+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/usb/usbip/usbip_common.c\"\n ],\n \"versions\": [\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"324262c38438255bf6bdbf6342ca47c0badaab76\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"973f2c250289f5bf6cc146b98aa6fdde11fe50d6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"ce744264b06b97069b3722511ab355738311fee0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"885c8591784da6314f9aa82fa460ac69f9f79e5f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"8d155e2d1c4102f74f82a2bf9c016164bb0f7384\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"906f16a836de13fe61f49cdce2f66f2dbd14caf4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"ef8ebb1c637b4cfb61a9dd2e013376774ee2033b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"5e1c4ece08ccdc197177631f111845a2c68eede3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1325f85fa49f57df034869de430f7c302ae23109\",\n \"lessThan\": \"2ab833a16a825373aad2ba7d54b572b277e95b71\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d9638d9236eed035a575feddec61d036dacc2676\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ca7d3501b7a287c18b5b470e871d3029b0f4842a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"1ce528277e1a66856ed3f7526c1e3458c0ed4a70\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"db898d0c5c493ce4177d5e1d3a953e079a56a24b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5aa02704b9ee67c5b2ee26d54c5f4eb99e93ba9a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2.6.32.37\",\n \"lessThan\": \"2.6.33\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"2.6.33.10\",\n \"lessThan\": \"2.6.34\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"2.6.34.11\",\n \"lessThan\": \"2.6.35\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"2.6.35.13\",\n \"lessThan\": \"2.6.36\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"2.6.38.3\",\n \"lessThan\": \"2.6.39\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/usb/usbip/usbip_common.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.39\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.39\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.258\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.209\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.136\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.83\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.24\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.14\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.1\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/324262c38438255bf6bdbf6342ca47c0badaab76","https://git.kernel.org/stable/c/973f2c250289f5bf6cc146b98aa6fdde11fe50d6","https://git.kernel.org/stable/c/ce744264b06b97069b3722511ab355738311fee0","https://git.kernel.org/stable/c/885c8591784da6314f9aa82fa460ac69f9f79e5f","https://git.kernel.org/stable/c/8d155e2d1c4102f74f82a2bf9c016164bb0f7384","https://git.kernel.org/stable/c/906f16a836de13fe61f49cdce2f66f2dbd14caf4","https://git.kernel.org/stable/c/ef8ebb1c637b4cfb61a9dd2e013376774ee2033b","https://git.kernel.org/stable/c/5e1c4ece08ccdc197177631f111845a2c68eede3","https://git.kernel.org/stable/c/2ab833a16a825373aad2ba7d54b572b277e95b71"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31607","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31607","identifiers":["CVE-2026-31607"]},"retained":false,"historicalAffected":[]}],"coverage":[]}