new file mode 100644
@@ -0,0 +1,59 @@
+From 4a2c827c2536aa03a1d6c7cc916689a46c067187 Mon Sep 17 00:00:00 2001
+From: Arne Schwabe <arne@rfc2549.org>
+Date: Fri, 10 Apr 2026 16:59:53 +0200
+Subject: [PATCH] Ensure that buffer of freed session are not used
+
+In a race condition an old TLS session could still try to send a packet but
+also get replaced by a new session. In this case, the buffer of the new
+session is still referenced. Add the check_session_buf_not_used function
+to mitigate this problem.
+
+Also make the check if the to_link pointer is in one of the memory
+regions a bit better even though this not make a difference with the
+way we use these structs. But better safe than sorry.
+
+A better solution to remove the TM_INITIAL state and handle reconnecting
+session in their own complete tls_multi is a more involved fix that requires
+a lot more refactoring.
+
+CVE: 2026-40215
+Reported-By: XlabAI Team of Tencent Xuanwu Lab (xlabai@tencent.com)
+Reported-By: Guannan Wang (wgnbuaa@gmail.com
+Reported-By: Zhanpeng Liu (pkugenuine@gmail.com)
+Reported-By: Guancheng Li (lgcpku@gmail.com)
+Signed-off-by: Arne Schwabe <arne@rfc2549.org>
+
+Change-Id: I7c5fa2a7a2563b7a8955d386411f3ceffe5b092f
+Private-URL: https://github.com/OpenVPN/openvpn-private-issues/issues/112
+Acked-by: Gert Doering <gert@greenie.muc.de>
+
+CVE: CVE-2026-40215
+Upstream-Status: Backport [https://github.com/OpenVPN/openvpn/commit/4a2c827c2536aa03a1d6c7cc916689a46c067187]
+
+Signed-off-by: Gert Doering <gert@greenie.muc.de>
+(cherry picked from commit b2a15fb84d85790eeae4a2e12b431cbfd0b0302f)
+Signed-off-by: Omkar Patil <OmkarAbaji.Patil@windriver.com>
+---
+ src/openvpn/ssl.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/openvpn/ssl.c b/src/openvpn/ssl.c
+index b188b4e9b32..a63d142ec46 100644
+--- a/src/openvpn/ssl.c
++++ b/src/openvpn/ssl.c
+@@ -3280,6 +3280,7 @@ tls_multi_process(struct tls_multi *multi, struct buffer *to_link,
+ if (i == TM_ACTIVE && ks_lame->state >= S_GENERATED_KEYS
+ && !multi->opt.single_session)
+ {
++ check_session_buf_not_used(to_link, session);
+ move_session(multi, TM_LAME_DUCK, TM_ACTIVE, true);
+ }
+ else
+@@ -3353,6 +3354,7 @@ tls_multi_process(struct tls_multi *multi, struct buffer *to_link,
+ */
+ if (TLS_AUTHENTICATED(multi, &multi->session[TM_INITIAL].key[KS_PRIMARY]))
+ {
++ check_session_buf_not_used(to_link, &multi->session[TM_ACTIVE]);
+ move_session(multi, TM_ACTIVE, TM_INITIAL, true);
+ tas = tls_authentication_status(multi);
+ msg(D_TLS_DEBUG_LOW,
@@ -12,6 +12,7 @@ SRC_URI = "http://swupdate.openvpn.org/community/releases/${BP}.tar.gz \
file://0001-tests-skip-test-execution-when-cross-compiling.patch \
file://openvpn \
file://run-ptest \
+ file://CVE-2026-40215.patch \
"
UPSTREAM_CHECK_URI = "https://openvpn.net/community-downloads"
A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion Reference: [https://nvd.nist.gov/vuln/detail/CVE-2026-40215] [https://security-tracker.debian.org/tracker/CVE-2026-40215] Upstream patch: [https://github.com/OpenVPN/openvpn/commit/4a2c827c2536aa03a1d6c7cc916689a46c067187] Signed-off-by: Omkar Patil <OmkarAbaji.Patil@windriver.com> --- .../openvpn/openvpn/CVE-2026-40215.patch | 59 +++++++++++++++++++ .../recipes-support/openvpn/openvpn_2.7.0.bb | 1 + 2 files changed, 60 insertions(+) create mode 100644 meta-networking/recipes-support/openvpn/openvpn/CVE-2026-40215.patch