CVE-2026-74262
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 3th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.