CVE-2024-26934High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: USB: core: Fix deadlock in usb_deauthorize_interface() Among the attribute file callback routines in drivers/usb/core/sysfs.c, the interface_authorized_store() functio…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
USB: core: Fix deadlock in usb_deauthorize_interface()
Among the attribute file callback routines in drivers/usb/core/sysfs.c, the interface_authorized_store() function is the only one which acquires a device lock on an ancestor device: It calls usb_deauthorize_interface(), which locks the interface's parent USB device.
The will lead to deadlock if another process already owns that lock and tries to remove the interface, whether through a configuration change or because the device has been disconnected. As part of the removal procedure, device_del() waits for all ongoing sysfs attribute callbacks to complete. But usb_deauthorize_interface() can't complete until the device lock has been released, and the lock won't be released until the removal has finished.
The mechanism provided by sysfs to prevent this kind of deadlock is to use the sysfs_break_active_protection() function, which tells sysfs not to wait for the attribute callback.
Reported-and-tested by: Yue Sun [email protected] Reported by: xingwei lee [email protected]
linux_kernel >= 4.4, < 4.19.312linux_kernel >= 4.20.0, < 5.4.274linux_kernel >= 5.5.0, < 5.10.215linux_kernel >= 5.11.0, < 5.15.154linux_kernel >= 5.16.0, < 6.1.84linux_kernel >= 6.2.0, < 6.6.24linux_kernel >= 6.7.0, < 6.7.12linux_kernel >= 6.8.0, < 6.8.3linux_kernel = 6.9Upgrade past the affected range:
linux_kernel 6.8.3Connected by shared product, vendor, weakness, or advisory.
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