In the Linux kernel, the following vulnerability has been resolved:

kcm: use WRITE_ONCE() when changing lower socket callbacks

kcm_attach() replaces a live lower TCP socket's sk_data_ready and
sk_write_space callbacks with KCM handlers, and kcm_unattach() restores
them later. Those callback-pointer updates are still plain stores even
though the same fields can be read and invoked concurrently on other
CPUs.

If another CPU observes an older callback snapshot after the live field
has already been restored, callback execution can run with a mismatched
target and sk_user_data state, leading to stale or misdirected wakeups.

Use WRITE_ONCE() for the callback replacement and restore operations so
these shared callback fields follow the same visibility contract already
established by the earlier 4022 fixes.

https://git.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161ee

https://git.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547fe

https://git.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854d

https://git.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0f

https://git.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468e

https://git.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36

https://git.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4

https://git.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43

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