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CVE-2026-98765

UnknownEPSS 0.17%

Last modified

CVE-2026-98765 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 32721319e89a2be610b0518b88f0d188ce878063; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 48ef54100ceffbd1a055f193873574c45f408eb5; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < d77cc7c0d739fb17413714c5c4914bd396502e20; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 6849e51b89de5b6fc7447dc8e612b58df19c7dea; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 5298c96bf0068f3160969f7ddad81976d01a9b66; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < 3070806a7bc7bb36ed04a21022c09dafcc5619f4; >= 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81, < b263ff9b0fc5c1f371d65c4eb196b31263d039ff; 7b416b9dac6ede26d4ca0c1a88b448b543623ff3; 8590bc1da625dd4a589eac0fc3aa3cf4f400424d; a867d5b932ac4911d3f8a1e63505061b0c81f889; e84b4a008365b7edbd842a063ae28d040a98db25; e39b17143a5b5aac81f066d455e5d3a9877eb3ae; 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715; >= 3.2.97, < 3.3; >= 3.16.52, < 3.17; >= 4.1.46, < 4.2; >= 4.4.92, < 4.5; >= 4.9.55, < 4.10; >= 4.13.6, < 4.14
LinuxLinux4.14

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98765?
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 severe is CVE-2026-98765?
Severity scoring for CVE-2026-98765 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98765?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST