CVE-2026-45995

io_uring/zcrx: fix user_struct uaf

Published: 5/27/2026 Last updated: 6/14/2026 Reserved: 5/13/2026

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix user_struct uaf io_free_rbuf_ring() usees a struct user_struct, which io_zcrx_ifq_free() puts it down before destroying the ring.

CNA assigner: Linux (416baaa9-dc9f-4396-8d5f-8c081fb06d67) Requested by: n/a

Opam packages affected (29)

albatross cdrom conf-bpftool conf-libbpf conf-linux-libc-dev core core_unix hvsock mirage-block-unix mm ocaml-probes ortools_solvers orun rawlink rawlink-eio rawlink-lwt restricted shell solo5 solo5-bindings-hvt solo5-bindings-spt solo5-cross-aarch64 solo5-kernel-ukvm tracy-client tuntap uring vhd-format vhd-format-lwt xapi-stdext-unix

Products affected (4)

Product	Vendor	Version
Linux	Linux	11.5.1-11.5.8
Linux	Linux	11.6.1-11.6.3
Linux	Linux	All
Linux	Linux	8.5.4

References (4)

https://git.kernel.org/stable/c/9feb88eeda6d288f93fcfb6bca563f89e316479d
https://git.kernel.org/stable/c/0fcccfd87152f957fa8312b841f6efef42a05a20
https://git.kernel.org/stable/c/9feb88eeda6d288f93fcfb6bca563f89e316479d
https://git.kernel.org/stable/c/0fcccfd87152f957fa8312b841f6efef42a05a20