CVE-2026-46262

Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: fsl_xcvr: Revert fix missing lock in fsl_xcvr_mode_put() This reverts commit f51424872760 ("ASoC: fsl_xcvr: fix missing lock in fsl_xcvr_mode_put()"). The original patch attempted to acquire the card->controls_rwsem lock in fsl_xcvr_mode_put(). However, this function is called from the upper ALSA core function snd_ctl_elem_write(), which already holds the write lock on controls_rwsem for the whole put operation. So there is no need to simply hold the lock for fsl_xcvr_activate_ctl() again. Acquiring the read lock while holding the write lock in the same thread results in a deadlock and a hung task, as reported by Alexander Stein.

References

• https://git.kernel.org/stable/c/0886dc6326c3cc596799c4340d342898301cf52a
• https://git.kernel.org/stable/c/29b2fbe3498da3681a01b34e4a2259f8a1b89448
• https://git.kernel.org/stable/c/30ffcad5edb56947dccc26f6816ab7a55b21a711
• https://git.kernel.org/stable/c/9a2a5da002775376498e8814df4a87cd629a3a0c
• https://git.kernel.org/stable/c/9f16d96e1222391a6b996a1b676bec14fb91e3b2