CVE-2026-74262
Description
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.
How to fix
- Linux Linux0cb3e2f40679032c1aa2186280a86e5ead0161ee, fa26e4606aed0f7fe793c325506adeda1d847a43, b4ccd6eef671d7c44a30123cd29f3acf3de8468e, b8c90823cdfb5f3d22f261aeb3e9066612853c36, 11faefd11ce2448bac7279ab302dd1954a6547fe, f01fb6138f8eb606b56ce9158e2d8b72352c53f4, 9684fff87124b201e11dea01ded9173025359a0f, 47186409c092cd7dd70350999186c700233e854d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < 0cb3e2f40679032c1aa2186280a86e5ead0161ee, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < fa26e4606aed0f7fe793c325506adeda1d847a43, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < b4ccd6eef671d7c44a30123cd29f3acf3de8468e, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < b8c90823cdfb5f3d22f261aeb3e9066612853c36, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < 11faefd11ce2448bac7279ab302dd1954a6547fe, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < f01fb6138f8eb606b56ce9158e2d8b72352c53f4, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < 9684fff87124b201e11dea01ded9173025359a0f, ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 ≤ v < 47186409c092cd7dd70350999186c700233e854d, 4.6 | 0cb3e2f40679032c1aa2186280a86e5ead0161ee, fa26e4606aed0f7fe793c325506adeda1d847a43, b4ccd6eef671d7c44a30123cd29f3acf3de8468e, b8c90823cdfb5f3d22f261aeb3e9066612853c36, 11faefd11ce2448bac7279ab302dd1954a6547fe, f01fb6138f8eb606b56ce9158e2d8b72352c53f4, 9684fff87124b201e11dea01ded9173025359a0f, 47186409c092cd7dd70350999186c700233e854d |
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