{"id":"CVE-2026-98765","title":"USB: gadget: dummy-hcd: Fix wait for outstanding request completions","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: dummy-hcd: Fix wait for outstanding request completions\n\nThe dummy-hcd driver emulates synchronize_irq() by waiting until its\nprivate callback_usage counte…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2","Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 5298c96bf0068f3160969f7ddad81976d01a9b66","Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 3070806a7bc7bb36ed04a21022c09dafcc5619f4","Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < b263ff9b0fc5c1f371d65c4eb196b31263d039ff","Linux 7b416b9dac6ede26d4ca0c1a88b448b543623ff3","Linux 8590bc1da625dd4a589eac0fc3aa3cf4f400424d","Linux a867d5b932ac4911d3f8a1e63505061b0c81f889","Linux e84b4a008365b7edbd842a063ae28d040a98db25","Linux e39b17143a5b5aac81f066d455e5d3a9877eb3ae","Linux 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715","Linux >= 3.2.97 < 3.3","Linux >= 3.16.52 < 3.17","Linux >= 4.1.46 < 4.2","Linux >= 4.4.92 < 4.5","Linux >= 4.9.55 < 4.10","Linux >= 4.13.6 < 4.14","Linux 4.14"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:47:57.358Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98765","references":[{"url":"https://git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2"},{"url":"https://git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66"},{"url":"https://git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4"},{"url":"https://git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.496Z","slug":"CVE-2026-98765","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: dummy-hcd: Fix wait for outstanding request completions\n\nThe dummy-hcd driver emulates synchronize_irq() by waiting until its\nprivate callback_usage counter drops to 0 (with the private lock not\nheld).  This counter is incremented whenever a gadget driver callback\noccurs (which requires the private lock to be dropped), but not when a\nrequest completion handler is called.\n\nThis is an oversight.  Request completion is triggered by timer\ninterrupts (emulating device IRQs in a real UDC), and the interrupt\nhandlers are supposed to have completed when the synchronize_irq()\nemulation routine returns -- they aren't supposed to be in the middle\nof a completion callback.  If this happens it can lead to a gadget\ndriver's unbind routine running before all outstanding request\ncompletions have finished, maybe even allowing the gadget driver's\nmodule to be unloaded while a completion handler is still running.\n\nFix the oversight by incrementing the callback_usage value across\nrequest completion callbacks.\n\n## Affected\n\n- `Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2`\n- `Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 5298c96bf0068f3160969f7ddad81976d01a9b66`\n- `Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < 3070806a7bc7bb36ed04a21022c09dafcc5619f4`\n- `Linux >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 < b263ff9b0fc5c1f371d65c4eb196b31263d039ff`\n- `Linux 7b416b9dac6ede26d4ca0c1a88b448b543623ff3`\n- `Linux 8590bc1da625dd4a589eac0fc3aa3cf4f400424d`\n- `Linux a867d5b932ac4911d3f8a1e63505061b0c81f889`\n- `Linux e84b4a008365b7edbd842a063ae28d040a98db25`\n- `Linux e39b17143a5b5aac81f066d455e5d3a9877eb3ae`\n- `Linux 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715`\n- `Linux >= 3.2.97 < 3.3`\n- `Linux >= 3.16.52 < 3.17`\n- `Linux >= 4.1.46 < 4.2`\n- `Linux >= 4.4.92 < 4.5`\n- `Linux >= 4.9.55 < 4.10`\n- `Linux >= 4.13.6 < 4.14`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}