Description
In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurrent thread. Defer the kfree() to an RCU callback to prevent UAF.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/07712db80857d5d09ae08f3df85a708ecfc3b61f Patch
- git.kernel.org/stable/c/5b1173b165421561db29f30afc7e97d940a398a9 Patch
- git.kernel.org/stable/c/7e8083f5eeedab0f460063b9c2c14c9a4e71a427 Patch
- git.kernel.org/stable/c/a6566cd33f6f967a7651ebf2ce0dd31572e319cf Patch
- git.kernel.org/stable/c/ae0bb9c1fb7c2594519aeeb096cf2c3b7837b322 Patch
- git.kernel.org/stable/c/902120be4f44947df6311002addc7faf69bdbff1
- git.kernel.org/stable/c/a6d57084372161f86660bc4607784420e00efe2c
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 42 · as of 13 November 2026
- CWE
- CWE-401CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.