[wrynose][PATCH v3] curl: fix CVE-2026-5773 - wrong reuse of SMB connection

[Jaipaul Cheernam <jaipaul.cheernam@est.tech>]

Remove PROTOPT_CONN_REUSE from SMB handler flags to prevent
connection pooling. Without this, a second SMB request to the same
host reuses a connection authenticated for a different share.

Reference: https://curl.se/docs/CVE-2026-5773.html

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 .../curl/curl/CVE-2026-5773.patch             | 48 +++++++++++++++++++
 meta/recipes-support/curl/curl_8.19.0.bb      |  1 +
 2 files changed, 49 insertions(+)
 create mode 100644 meta/recipes-support/curl/curl/CVE-2026-5773.patch

diff --git a/meta/recipes-support/curl/curl/CVE-2026-5773.patch b/meta/recipes-support/curl/curl/CVE-2026-5773.patch
new file mode 100644
index 0000000000..970e04b33f
--- /dev/null
+++ b/meta/recipes-support/curl/curl/CVE-2026-5773.patch
@@ -0,0 +1,48 @@
+From 74a169575d6412dc0ff532acdf94de35a6c2a571 Mon Sep 17 00:00:00 2001
+From: Daniel Stenberg <daniel@haxx.se>
+Date: Sun, 5 Apr 2026 18:23:35 +0200
+Subject: [PATCH] protocol: disable connection reuse for SMB(S)
+
+Connections should only be reused when using the same "share" (and
+perhaps some additional conditions), but instead of fixing this flaw,
+this change completely disables connection reuse for SMB. This protocol
+is about to get dropped soon anyway.
+
+Reported-by: Osama Hamad
+Closes #21238
+Signed-off-by: Daniel Stenberg <daniel@haxx.se>
+
+CVE: CVE-2026-5773
+Upstream-Status: Backport [https://github.com/curl/curl/commit/74a169575d6412dc0ff532acdf94de35a6c2a571]
+
+Note: The upstream fix targets lib/protocol.c which was introduced in
+curl 8.20.0. In 8.19.0 the SMB handler flags are still in lib/smb.c,
+so this patch removes PROTOPT_CONN_REUSE there instead. The effect is
+identical: SMB connections are no longer pooled for reuse.
+
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ lib/smb.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/lib/smb.c b/lib/smb.c
+index ccd4f3f69d..2a9f08388f 100644
+--- a/lib/smb.c
++++ b/lib/smb.c
+@@ -1242,7 +1242,7 @@
+ #endif
+   CURLPROTO_SMB,                        /* protocol */
+   CURLPROTO_SMB,                        /* family */
+-  PROTOPT_CONN_REUSE,                   /* flags */
++  PROTOPT_NONE,                         /* flags */
+   PORT_SMB,                             /* defport */
+ };
+ 
+@@ -1259,7 +1259,7 @@
+ #endif
+   CURLPROTO_SMBS,                       /* protocol */
+   CURLPROTO_SMB,                        /* family */
+-  PROTOPT_SSL | PROTOPT_CONN_REUSE,     /* flags */
++  PROTOPT_SSL,                          /* flags */
+   PORT_SMBS,                            /* defport */
+ };
diff --git a/meta/recipes-support/curl/curl_8.19.0.bb b/meta/recipes-support/curl/curl_8.19.0.bb
index d58b774011..3326f478b5 100644
--- a/meta/recipes-support/curl/curl_8.19.0.bb
+++ b/meta/recipes-support/curl/curl_8.19.0.bb
@@ -15,6 +15,7 @@ SRC_URI = " \
     file://disable-tests \
     file://no-test-timeout.patch \
     file://CVE-2026-6276.patch \
+    file://CVE-2026-5773.patch \
     file://mbedtls.patch \
 "
 
-- 
2.34.1