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CVE-2026-98765

Linux: USB: gadget: dummy-hcd: Fix wait for outstanding request completions

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6849e51b89de5b6fc7447dc8e612b58df19c7deaAlso 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2, 5298c96bf0068f3160969f7ddad81976d01a9b66 and 7 moreCVE List
Published18 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

  • 6849e51b89de5b6fc7447dc8e612b58df19c7deaLinuxCVE List
  • 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2LinuxCVE List
  • 5298c96bf0068f3160969f7ddad81976d01a9b66LinuxCVE List
  • 3070806a7bc7bb36ed04a21022c09dafcc5619f4LinuxCVE List
  • 3.3LinuxCVE List
  • 3.17LinuxCVE List
Show all 10 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 24

  • Linuxaffected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 6849e51b89de5b6fc7447dc8e612b58df19c7deaCVE List
  • Linuxaffected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2CVE List
  • Linuxaffected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 5298c96bf0068f3160969f7ddad81976d01a9b66CVE List
  • Linuxaffected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before 3070806a7bc7bb36ed04a21022c09dafcc5619f4CVE List
  • Linuxaffected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 before b263ff9b0fc5c1f371d65c4eb196b31263d039ffCVE List
  • Linuxaffected: 7b416b9dac6ede26d4ca0c1a88b448b543623ff3CVE List
  • Linuxaffected: 8590bc1da625dd4a589eac0fc3aa3cf4f400424dCVE List
  • Linuxaffected: a867d5b932ac4911d3f8a1e63505061b0c81f889CVE List
  • Linuxaffected: e84b4a008365b7edbd842a063ae28d040a98db25CVE List
  • Linuxaffected: e39b17143a5b5aac81f066d455e5d3a9877eb3aeCVE List
  • Linuxaffected: 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715CVE List
  • Linuxaffected: 3.2.97 before 3.3CVE List
  • Linuxaffected: 3.16.52 before 3.17CVE List
  • Linuxaffected: 4.1.46 before 4.2CVE List
  • Linuxaffected: 4.4.92 before 4.5CVE List
  • Linuxaffected: 4.9.55 before 4.10CVE List
  • Linuxaffected: 4.13.6 before 4.14CVE List
  • Linuxaffected: 4.14CVE List
  • Linuxunaffected: all versions before 4.14CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5