{"api_version":"1","generated_at":"2026-07-23T15:37:32+00:00","cve":"CVE-2026-63874","urls":{"html":"https://cve.report/CVE-2026-63874","api":"https://cve.report/api/cve/CVE-2026-63874.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63874","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63874"},"summary":{"title":"net: mctp: usb: fix race between urb completion and rx_retry cancellation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: usb: fix race between urb completion and rx_retry cancellation\n\nIt's possible that sequencing between setting ->stopped and cancelling\nthe rx_retry work (in ndo_stop) could leave us with an urb queued:\n\n    T1: ndo_stop                  T2: rx_retry_work\n    ------------                  ----------------\n                                  LD: ->stopped => false\n    ST: ->stopped <= true\n    usb_kill_urb()\n                                  mctp_usb_rx_queue()\n                                    usb_submit_urb()\n    cancel_delayed_work_sync()\n\nThat urb completion can then re-schedule rx_retry_work.\n\nStrenghen the sequencing between the stop (preventing another requeue)\nand the cancel by updating both atomically under a new rx lock. After\nsetting ->rx_stopped, and cancelling pending work, we know that the\nrequeue cannot occur, so all that's left is killing any pending urb.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:54","updated_at":"2026-07-20 15:16:53"},"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/54665dce982689e2fd99b32e9a0dcc204fda8a51","name":"https://git.kernel.org/stable/c/54665dce982689e2fd99b32e9a0dcc204fda8a51","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c46f3ee1837f6881cb99a52ffecb2760f11dc73","name":"https://git.kernel.org/stable/c/9c46f3ee1837f6881cb99a52ffecb2760f11dc73","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d90feaa3f74bea8dafb6494631a194c70e547d94","name":"https://git.kernel.org/stable/c/d90feaa3f74bea8dafb6494631a194c70e547d94","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63874","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63874","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 9c46f3ee1837f6881cb99a52ffecb2760f11dc73 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 d90feaa3f74bea8dafb6494631a194c70e547d94 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 54665dce982689e2fd99b32e9a0dcc204fda8a51 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63874","cve":"CVE-2026-63874","epss":"0.001550000","percentile":"0.050640000","score_date":"2026-07-20","updated_at":"2026-07-21 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the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: usb: fix race between urb completion and rx_retry cancellation\n\nIt's possible that sequencing between setting ->stopped and cancelling\nthe rx_retry work (in ndo_stop) could leave us with an urb queued:\n\n    T1: ndo_stop                  T2: rx_retry_work\n    ------------                  ----------------\n                                  LD: ->stopped => false\n    ST: ->stopped <= true\n    usb_kill_urb()\n                                  mctp_usb_rx_queue()\n                                    usb_submit_urb()\n    cancel_delayed_work_sync()\n\nThat urb completion can then re-schedule rx_retry_work.\n\nStrenghen the sequencing between the stop (preventing another requeue)\nand the cancel by updating both atomically under a new rx lock. After\nsetting ->rx_stopped, and cancelling pending work, we know that the\nrequeue cannot occur, so all that's left is killing any pending urb."}],"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"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:05.329Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9c46f3ee1837f6881cb99a52ffecb2760f11dc73"},{"url":"https://git.kernel.org/stable/c/d90feaa3f74bea8dafb6494631a194c70e547d94"},{"url":"https://git.kernel.org/stable/c/54665dce982689e2fd99b32e9a0dcc204fda8a51"}],"title":"net: mctp: usb: fix race between urb completion and rx_retry cancellation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63874","datePublished":"2026-07-19T14:18:41.907Z","dateReserved":"2026-07-19T07:54:57.017Z","dateUpdated":"2026-07-20T13:41:05.329Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:54","lastModifiedDate":"2026-07-20 15:16:53","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":"63874","Ordinal":"1","Title":"net: mctp: usb: fix race between urb completion and rx_retry can","CVE":"CVE-2026-63874","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63874","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: usb: fix race between urb completion and rx_retry cancellation\n\nIt's possible that sequencing between setting ->stopped and cancelling\nthe rx_retry work (in ndo_stop) could leave us with an urb queued:\n\n    T1: ndo_stop                  T2: rx_retry_work\n    ------------                  ----------------\n                                  LD: ->stopped => false\n    ST: ->stopped <= true\n    usb_kill_urb()\n                                  mctp_usb_rx_queue()\n                                    usb_submit_urb()\n    cancel_delayed_work_sync()\n\nThat urb completion can then re-schedule rx_retry_work.\n\nStrenghen the sequencing between the stop (preventing another requeue)\nand the cancel by updating both atomically under a new rx lock. After\nsetting ->rx_stopped, and cancelling pending work, we know that the\nrequeue cannot occur, so all that's left is killing any pending urb.","Type":"Description","Title":"net: mctp: usb: fix race between urb completion and rx_retry can"}]}}}