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Wed, 14 Oct 2026 14:39:16 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/247772 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 --- .../libpcap/libpcap/06-CVE-2026-18313.patch | 84 +++++++++++++++++++ .../libpcap/libpcap_1.10.4.bb | 1 + 2 files changed, 85 insertions(+) create mode 100644 meta/recipes-connectivity/libpcap/libpcap/06-CVE-2026-18313.patch diff --git a/meta/recipes-connectivity/libpcap/libpcap/06-CVE-2026-18313.patch b/meta/recipes-connectivity/libpcap/libpcap/06-CVE-2026-18313.patch new file mode 100644 index 0000000000..2a9df12e2a --- /dev/null +++ b/meta/recipes-connectivity/libpcap/libpcap/06-CVE-2026-18313.patch @@ -0,0 +1,84 @@ +From f9775af1a0ec76db60c7213241e6b48f1be10ac7 Mon Sep 17 00:00:00 2001 +From: Denis Ovsienko +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) + +Notes on backporting to 1.10.4: + - The upstream CHANGES/changelog hunk is not backported. + +Upstream-Status: Backport [https://github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6b48f1be10ac7] +CVE: CVE-2026-18313 +Signed-off-by: Jaipaul Cheernam +--- +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 diff --git a/meta/recipes-connectivity/libpcap/libpcap_1.10.4.bb b/meta/recipes-connectivity/libpcap/libpcap_1.10.4.bb index f7ba1bf3ea..5f1506f8fc 100644 --- a/meta/recipes-connectivity/libpcap/libpcap_1.10.4.bb +++ b/meta/recipes-connectivity/libpcap/libpcap_1.10.4.bb @@ -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"