CVE-2026-98765
Description
In the Linux kernel, the following vulnerability has been resolved: USB: gadget: dummy-hcd: Fix wait for outstanding request completions The dummy-hcd driver emulates synchronize_irq() by waiting until its private callback_usage counter drops to 0 (with the private lock not held). This counter is incremented whenever a gadget driver callback occurs (which requires the private lock to be dropped), but not when a request completion handler is called. This is an oversight. Request completion is triggered by timer interrupts (emulating device IRQs in a real UDC), and the interrupt handlers are supposed to have completed when the synchronize_irq() emulation routine returns -- they aren't supposed to be in the middle of a completion callback. If this happens it can lead to a gadget driver's unbind routine running before all outstanding request completions have finished, maybe even allowing the gadget driver's module to be unloaded while a completion handler is still running. Fix the oversight by incrementing the callback_usage value across request completion callbacks.
How to fix
- Linux Linux32721319e89a2be610b0518b88f0d188ce878063, 48ef54100ceffbd1a055f193873574c45f408eb5, d77cc7c0d739fb17413714c5c4914bd396502e20, 6849e51b89de5b6fc7447dc8e612b58df19c7dea, 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2, 5298c96bf0068f3160969f7ddad81976d01a9b66, 3070806a7bc7bb36ed04a21022c09dafcc5619f4, b263ff9b0fc5c1f371d65c4eb196b31263d039ff, 3.3, 3.17, 4.2, 4.5, 4.10, 4.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 32721319e89a2be610b0518b88f0d188ce878063, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 48ef54100ceffbd1a055f193873574c45f408eb5, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < d77cc7c0d739fb17413714c5c4914bd396502e20, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 6849e51b89de5b6fc7447dc8e612b58df19c7dea, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 5298c96bf0068f3160969f7ddad81976d01a9b66, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < 3070806a7bc7bb36ed04a21022c09dafcc5619f4, 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 ≤ v < b263ff9b0fc5c1f371d65c4eb196b31263d039ff, 7b416b9dac6ede26d4ca0c1a88b448b543623ff3, 8590bc1da625dd4a589eac0fc3aa3cf4f400424d, a867d5b932ac4911d3f8a1e63505061b0c81f889, e84b4a008365b7edbd842a063ae28d040a98db25, e39b17143a5b5aac81f066d455e5d3a9877eb3ae, 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715, 3.2.97 ≤ v < 3.3, 3.16.52 ≤ v < 3.17, 4.1.46 ≤ v < 4.2, 4.4.92 ≤ v < 4.5, 4.9.55 ≤ v < 4.10, 4.13.6 ≤ v < 4.14, 4.14 | 32721319e89a2be610b0518b88f0d188ce878063, 48ef54100ceffbd1a055f193873574c45f408eb5, d77cc7c0d739fb17413714c5c4914bd396502e20, 6849e51b89de5b6fc7447dc8e612b58df19c7dea, 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2, 5298c96bf0068f3160969f7ddad81976d01a9b66, 3070806a7bc7bb36ed04a21022c09dafcc5619f4, b263ff9b0fc5c1f371d65c4eb196b31263d039ff, 3.3, 3.17, 4.2, 4.5, 4.10, 4.14 |
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