USB: gadget: dummy-hcd: Fix wait for outstanding request completions
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 3.3, 3.17, 4.2, 4.5, 4.10, and 5 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 · fixed in 6849e51b89de5b6fc7447dc8e612b58df19c7dea; From 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 · fixed in 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2; From 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 · fixed in 5298c96bf0068f3160969f7ddad81976d01a9b66; From 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 · fixed in 3070806a7bc7bb36ed04a21022c09dafcc5619f4; From 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 · fixed in b263ff9b0fc5c1f371d65c4eb196b31263d039ff; From 3.2.97 · fixed in 3.3; From 3.16.52 · fixed in 3.17; From 4.1.46 · fixed in 4.2; From 4.4.92 · fixed in 4.5; From 4.9.55 · fixed in 4.10; From 4.13.6 · fixed in 4.14
- Linux Linux
4.14
- KernelLinux
From 4.14.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10