CVE-2026-43089

xfrm_user: fix info leak in build_mapping()

Published: 5/6/2026 Last updated: 6/1/2026 Reserved: 5/1/2026

In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

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	All versions < V4.1.4
Linux	Linux	2019
Linux	Linux	n/a
Linux	Linux	Windows 10 for x64-based Systems

CVE-2026-43089

xfrm_user: fix info leak in build_mapping()

Opam packages affected (29)

Products affected (4)

References (16)