VULNERABILITY

Debian: CVE-2022-49755: linux -- security update

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Debian: CVE-2022-49755: linux -- security update

Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
03/27/2025
Created
04/01/2025
Added
03/31/2025
Modified
04/01/2025

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait While performing fast composition switch, there is a possibility that the process of ffs_ep0_write/ffs_ep0_read get into a race condition due to ep0req being freed up from functionfs_unbind. Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't bounded so it can go ahead and mark the ep0req to NULL, and since there is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free. Fix this by making a serialized execution between the two functions using a mutex_lock(ffs->mutex).

Solution(s)

  • debian-upgrade-linux

References

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