Linux Kernel: ALSA fsl_xcvr Mode Put Lock Reversal Causing Deadlock
CVE-2026-46262 Published on June 3, 2026
ASoC: fsl_xcvr: Revert fix missing lock in fsl_xcvr_mode_put()
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.
Products Associated with CVE-2026-46262
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Affected Versions
Linux:- Version 612ffe1f4f0499b3011f16d06e354a76dae2e2d1 and below ae5a70e3e87c28edbaf9939cfef1bcbd9615420f is affected.
- Version 38354c82abe7bcbcd1182a06af89d3cc16d3e2c7 and below 30ffcad5edb56947dccc26f6816ab7a55b21a711 is affected.
- Version 61e007657bf7740d54ca2aadce0fb5997839818e and below 29b2fbe3498da3681a01b34e4a2259f8a1b89448 is affected.
- Version daaf4fe333e0d48b2037cd2270bf1ff8f70d5068 and below b0f74f5d24fe3c73ef1369a811891198b54c1e8e is affected.
- Version cab928242853a832ffa7efda270ecfb9efeebb6e and below 9a2a5da002775376498e8814df4a87cd629a3a0c is affected.
- Version f514248727606b9087bc38a284ff686e0093abf1 and below 0886dc6326c3cc596799c4340d342898301cf52a is affected.
- Version f514248727606b9087bc38a284ff686e0093abf1 and below 9f16d96e1222391a6b996a1b676bec14fb91e3b2 is affected.
- Version 5.15.201 and below 5.15.202 is affected.
- Version 6.1.164 and below 6.1.165 is affected.
- Version 6.6.127 and below 6.6.128 is affected.
- Version 6.12.74 and below 6.12.75 is affected.
- Version 6.18.13 and below 6.18.14 is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 5.15.202, <= 5.15.* is unaffected.
- Version 6.1.165, <= 6.1.* is unaffected.
- Version 6.6.128, <= 6.6.* is unaffected.
- Version 6.12.75, <= 6.12.* is unaffected.
- Version 6.18.14, <= 6.18.* is unaffected.
- Version 6.19.4, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.