ettercap: patch CVE-2026-3603

Details: https://nvd.nist.gov/vuln/detail/CVE-2026-3606

Pick the commit that is marked to solve the related Github
issue[1]. Its commit message also references the CVE ID explicitly.

[1]: https://github.com/Ettercap/ettercap/issues/1297

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-networking/recipes-support/ettercap/ettercap/CVE-2026-3606.patch

@@ -0,0 +1,48 @@
+From e5f5c671296e7ee678e93968e133a932c76986ad Mon Sep 17 00:00:00 2001
+From: Alexander Koeppe <alexander@koeppe.rocks>
+Date: Sun, 8 Mar 2026 17:57:39 +0100
+Subject: [PATCH] Fix heap-out-of-bounds read issue in etterfilter
+ (CVE-2026-3606)
+
+CVE: CVE-2026-3606
+Upstream-Status: Backport [https://github.com/Ettercap/ettercap/commit/41c312d4be6f6067968a275bf66b2abd2a0ba385]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ include/ec.h                  | 6 ++++++
+ utils/etterfilter/ef_output.c | 4 ++--
+ 2 files changed, 8 insertions(+), 2 deletions(-)
+
+diff --git a/include/ec.h b/include/ec.h
+index 4e363b0a..66da146e 100644
+--- a/include/ec.h
++++ b/include/ec.h
+@@ -81,6 +81,12 @@
+    ON_ERROR(x, NULL, "virtual memory exhausted"); \
+ } while(0)
+ 
++#define SAFE_RECALLOC(x, s) do { \
++   x = realloc(x, s); \
++   ON_ERROR(x, NULL, "virtual memory exhausted"); \
++   memset(x, 0, s); \
++} while(0)
++
+ #define SAFE_STRDUP(x, s) do{ \
+    x = strdup(s); \
+    ON_ERROR(x, NULL, "virtual memory exhausted"); \
+diff --git a/utils/etterfilter/ef_output.c b/utils/etterfilter/ef_output.c
+index 2530e599..2f49177e 100644
+--- a/utils/etterfilter/ef_output.c
++++ b/utils/etterfilter/ef_output.c
+@@ -150,10 +150,10 @@ static size_t create_data_segment(u_char** data, struct filter_header *fh, struc
+ static size_t add_data_segment(u_char **data, size_t base, u_char **string, size_t slen)
+ {
+    /* make room for the new string */
+-   SAFE_REALLOC(*data, base + slen + 1);
++   SAFE_RECALLOC(*data, base + slen + 1);
+ 
+    /* copy the string, NULL separated */
+-   memcpy(*data + base, *string, slen + 1);
++   memcpy(*data + base, *string, slen);
+ 
+    /* 
+     * change the pointer to the new string location 

meta-networking/recipes-support/ettercap/ettercap_0.8.3.1.bb

@@ -19,7 +19,9 @@ DEPENDS += "ethtool \
 
 RDEPENDS:${PN} += "bash ethtool libgcc"
 
-SRC_URI = "gitsm://github.com/Ettercap/ettercap;branch=master;protocol=https"
+SRC_URI = "gitsm://github.com/Ettercap/ettercap;branch=master;protocol=https \
+           file://CVE-2026-3606.patch \
+           "
 
 SRCREV = "7281fbddb7da7478beb1d21e3cb105fff3778b31"