{"api_version":"1","generated_at":"2026-08-03T12:16:46+00:00","cve":"CVE-2026-64331","urls":{"html":"https://cve.report/CVE-2026-64331","api":"https://cve.report/api/cve/CVE-2026-64331.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64331","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64331"},"summary":{"title":"usbip: vudc: fix NULL deref in vep_dequeue()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: fix NULL deref in vep_dequeue()\n\nvep_alloc_request() wasn't initializing vrequest->udc, so cancellations\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\nUDC reference.\n\nSince vrequest->udc is never actually properly used anywhere, we opt to\nremove it, and update vep_dequeue to obtain a reference to the udc with\nep_to_vudc(), consistent with the other vep_ ops.\n\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\nstressed the FunctionFS AIO path on usbip's vudc.\n\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\nvia AIO. Before the fix, running `usbip attach` from the host would\ncause the guest to oops with the following backtrace:\n\nCall trace:\n vep_dequeue+0x1c/0xe4 (P)\n usb_ep_dequeue+0x14/0x20\n ffs_aio_cancel+0x24/0x34\n __arm64_sys_io_cancel+0xb0/0x124\n do_el0_svc+0x68/0x100\n el0_svc+0x18/0x5c\n el0t_64_sync_handler+0x98/0xdc\n el0t_64_sync+0x154/0x158","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:14","updated_at":"2026-07-25 10:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652","name":"https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9","name":"https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757","name":"https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a","name":"https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd","name":"https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e","name":"https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97","name":"https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f","name":"https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64331","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64331","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b6a0ca11186759ad7045d68a5447b1e89f658384 9858c91d9ee6a13c45311569039413729fc9b757 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b6a0ca11186759ad7045d68a5447b1e89f658384 1226293ec9bed3d4cc5b05eeeb811d315ca51652 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b6a0ca11186759ad7045d68a5447b1e89f658384 3750f75f29f99c0223601e2ee73ad084adec47bd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b6a0ca11186759ad7045d68a5447b1e89f658384 d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97 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 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64331","cve":"CVE-2026-64331","epss":"0.001770000","percentile":"0.075090000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/usbip/vudc.h","drivers/usb/usbip/vudc_dev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9858c91d9ee6a13c45311569039413729fc9b757","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"1226293ec9bed3d4cc5b05eeeb811d315ca51652","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"3750f75f29f99c0223601e2ee73ad084adec47bd","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"0025276175fbbe0dcbf3f84d090b0adee769e9d9","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"347b59e9f96719d89b6ef555d02a18ada1a5846f","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"0443e4416aa1ee97748d1ed904eaf3352c60045e","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"},{"lessThan":"c5371e0b91b24159a3ebaa61e70b0980bcf03c0a","status":"affected","version":"b6a0ca11186759ad7045d68a5447b1e89f658384","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/usbip/vudc.h","drivers/usb/usbip/vudc_dev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.7"},{"lessThan":"4.7","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":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"4.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: fix NULL deref in vep_dequeue()\n\nvep_alloc_request() wasn't initializing vrequest->udc, so cancellations\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\nUDC reference.\n\nSince vrequest->udc is never actually properly used anywhere, we opt to\nremove it, and update vep_dequeue to obtain a reference to the udc with\nep_to_vudc(), consistent with the other vep_ ops.\n\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\nstressed the FunctionFS AIO path on usbip's vudc.\n\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\nvia AIO. Before the fix, running `usbip attach` from the host would\ncause the guest to oops with the following backtrace:\n\nCall trace:\n vep_dequeue+0x1c/0xe4 (P)\n usb_ep_dequeue+0x14/0x20\n ffs_aio_cancel+0x24/0x34\n __arm64_sys_io_cancel+0xb0/0x124\n do_el0_svc+0x68/0x100\n el0_svc+0x18/0x5c\n el0t_64_sync_handler+0x98/0xdc\n el0t_64_sync+0x154/0x158"}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:58.370Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757"},{"url":"https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652"},{"url":"https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd"},{"url":"https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97"},{"url":"https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9"},{"url":"https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f"},{"url":"https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e"},{"url":"https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"}],"title":"usbip: vudc: fix NULL deref in vep_dequeue()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64331","datePublished":"2026-07-25T08:49:58.370Z","dateReserved":"2026-07-19T15:36:31.781Z","dateUpdated":"2026-07-25T08:49:58.370Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:14","lastModifiedDate":"2026-07-25 10:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64331","Ordinal":"1","Title":"usbip: vudc: fix NULL deref in vep_dequeue()","CVE":"CVE-2026-64331","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64331","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: fix NULL deref in vep_dequeue()\n\nvep_alloc_request() wasn't initializing vrequest->udc, so cancellations\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\nUDC reference.\n\nSince vrequest->udc is never actually properly used anywhere, we opt to\nremove it, and update vep_dequeue to obtain a reference to the udc with\nep_to_vudc(), consistent with the other vep_ ops.\n\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\nstressed the FunctionFS AIO path on usbip's vudc.\n\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\nvia AIO. Before the fix, running `usbip attach` from the host would\ncause the guest to oops with the following backtrace:\n\nCall trace:\n vep_dequeue+0x1c/0xe4 (P)\n usb_ep_dequeue+0x14/0x20\n ffs_aio_cancel+0x24/0x34\n __arm64_sys_io_cancel+0xb0/0x124\n do_el0_svc+0x68/0x100\n el0_svc+0x18/0x5c\n el0t_64_sync_handler+0x98/0xdc\n el0t_64_sync+0x154/0x158","Type":"Description","Title":"usbip: vudc: fix NULL deref in vep_dequeue()"}]}}}