new file mode 100644
@@ -0,0 +1,81 @@
+From f9775af1a0ec76db60c7213241e6b48f1be10ac7 Mon Sep 17 00:00:00 2001
+From: Denis Ovsienko <denis@ovsienko.info>
+Date: Sat, 1 Aug 2026 18:24:48 +0100
+Subject: [PATCH] CVE-2026-18313: Fix a memory leak in rpcapd.
+
+This vulnerability was originally reported publicly, hence no credit is
+given.
+
+daemon_unpackapplyfilter() can allocate a temporary buffer for up to
+RPCAP_BPF_MAXINSNS (8192) BPF instructions (65536 bytes) per each
+received RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ message.
+It never frees the memory, so repeated messages from a client will
+eventually leak enough memory on the server to cause problems. This
+holds for all connections that pass the validation and some connections
+that do not.
+
+48 bytes in 1 blocks are definitely lost in loss record 2 of 2
+ at 0x4844818: malloc (vg_replace_malloc.c:446)
+ by 0x111AAB: daemon_unpackapplyfilter (daemon.c:2372)
+ by 0x113279: daemon_msg_startcap_req.constprop.0 (daemon.c:2139)
+ by 0x114808: daemon_serviceloop (daemon.c:901)
+ by 0x115BC7: accept_connection (rpcapd.c:1321)
+ by 0x115BC7: accept_connections (rpcapd.c:1118)
+ by 0x115BC7: main_startup (rpcapd.c:709)
+ by 0x1112BD: main (rpcapd.c:567)
+
+To fix this, after a successful malloc() return exactly once, after the
+free() call.
+
+(backported from commit 26a1c75702b105ac8788014f35f1b5c57fa6043b)
+
+(cherry picked from commit f9775af1a0ec76db60c7213241e6b48f1be10ac7)
+
+Upstream-Status: Backport [https://github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6b48f1be10ac7]
+CVE: CVE-2026-18313
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+diff --git a/rpcapd/daemon.c b/rpcapd/daemon.c
+index 9b0f8285..b0268688 100644
+--- a/rpcapd/daemon.c
++++ b/rpcapd/daemon.c
+@@ -2378,14 +2378,8 @@ daemon_unpackapplyfilter(SOCKET sockctrl, SSL *ctrl_ssl, struct session *session
+ {
+ status = rpcapd_recv(sockctrl, ctrl_ssl, (char *) &insn,
+ sizeof(struct rpcap_filterbpf_insn), plenp, errmsgbuf);
+- if (status == -1)
+- {
+- return -1;
+- }
+- if (status == -2)
+- {
+- return -2;
+- }
++ if (status == -1 || status == -2)
++ goto free_and_return_status;
+
+ bf_insn->code = ntohs(insn.code);
+ bf_insn->jf = insn.jf;
+@@ -2401,16 +2395,19 @@ daemon_unpackapplyfilter(SOCKET sockctrl, SSL *ctrl_ssl, struct session *session
+ if (bpf_validate(bf_prog.bf_insns, bf_prog.bf_len) == 0)
+ {
+ snprintf(errmsgbuf, PCAP_ERRBUF_SIZE, "The filter contains bogus instructions");
+- return -2;
++ status = -2;
++ goto free_and_return_status;
+ }
+
+ if (pcap_setfilter(session->fp, &bf_prog))
+ {
+ snprintf(errmsgbuf, PCAP_ERRBUF_SIZE, "RPCAP error: %s", pcap_geterr(session->fp));
+- return -2;
++ status = -2;
+ }
+
+- return 0;
++free_and_return_status:
++ free(bf_prog.bf_insns);
++ return status;
+ }
+
+ static int
@@ -22,6 +22,7 @@ SRC_URI = "https://www.tcpdump.org/release/${BP}.tar.gz \
file://03-CVE-2026-31911.patch \
file://04-CVE-2026-6244.patch \
file://05-CVE-2026-6554.patch \
+ file://06-CVE-2026-18313.patch \
"
SRC_URI[sha256sum] = "ed19a0383fad72e3ad435fd239d7cd80d64916b87269550159d20e47160ebe5f"
NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18313 Upstream-commit: https://github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6b48f1be10ac7 Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech> --- .../libpcap/libpcap/06-CVE-2026-18313.patch | 81 +++++++++++++++++++ .../libpcap/libpcap_1.10.4.bb | 1 + 2 files changed, 82 insertions(+) create mode 100644 meta/recipes-connectivity/libpcap/libpcap/06-CVE-2026-18313.patch