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openvpn: fix CVE-2026-40215

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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>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Omkar Patil
2026-08-07 08:21:23 +05:30
committed by Anuj Mittal
parent 138d9ded13
commit 0cab969504
2 changed files with 60 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta-networking/recipes-support/openvpn/openvpn/CVE-2026-40215.patch
+59
View File
@@ -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,
meta-networking/recipes-support/openvpn/openvpn_2.7.0.bb
+1
View File
@@ -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"