What’s Vulnerable › Vulnerabilities

CVE-2026-46262: ASoC: fsl_xcvr: Revert fix missing lock in fsl_xcvr_mode_put()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-03 · updated 2026-07-22
• Weakness: CWE-667

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.

Affected products

• Linux kernel: from 6.19.1 before 6.19.4; 5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.18.13, 6.19 — fixed in 6.19.4

How to fix

Upgrade to a fixed version: Linux kernel 6.19.4. Check the vendor advisory for mitigations.

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
• https://git.kernel.org/stable/c/ae5a70e3e87c28edbaf9939cfef1bcbd9615420f
• https://git.kernel.org/stable/c/b0f74f5d24fe3c73ef1369a811891198b54c1e8e

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