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dnsmasq: Fix CVE-2026-4892

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Pick patch from [1] dnsmasq 2.90 debian bookworm pacthes.

[1] https://sources.debian.org/src/dnsmasq/2.90-4~deb12u2/debian/patches/CVE-2026-4892.patch

Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
Reviewed-by: Bruno VERNAY <bruno.vernay@se.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Hugo SIMELIERE (Schneider Electric)
2026-05-20 14:29:06 +02:00
committed by Anuj Mittal
parent cab6f6c603
commit e614003e0a
2 changed files with 42 additions and 0 deletions
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meta-networking/recipes-support/dnsmasq/dnsmasq_2.90.bb
+1
View File
@@ -17,6 +17,7 @@ SRC_URI = "http://www.thekelleys.org.uk/dnsmasq/${@['archive/', ''][float(d.getV
file://dnsmasq-noresolvconf.service \
file://dnsmasq-resolved.conf \
file://CVE-2026-4891.patch \
file://CVE-2026-4892.patch \
"
SRC_URI[sha256sum] = "8f6666b542403b5ee7ccce66ea73a4a51cf19dd49392aaccd37231a2c51b303b"
meta-networking/recipes-support/dnsmasq/files/CVE-2026-4892.patch
+41
View File
@@ -0,0 +1,41 @@
From 2f029069825270a3b91eb5f50bb8477ed7f761d3 Mon Sep 17 00:00:00 2001
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Wed, 25 Mar 2026 23:16:35 +0000
Subject: [PATCH] Fix buffer overflow in helper.c with large CLIDs.
CVE-2026-4892
Bug reported bt Royce M <royce@xchglabs.com>
Location: helper.c:265-270
DHCPv6 CLIDs can be up to 65535 bytes. When --dhcp-script is configured,
the helper hex-encodes raw CLID bytes via sprintf("%.2x") into daemon->packet (5131 bytes).
A 1000-byte CLID writes ~3000 bytes. The helper process retains root privileges.
Note: log6_packet() correctly caps CLID to 100 bytes for logging, but the helper code path was missed.
CVE: CVE-2026-4892
Upstream-Status: Backport [https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=10e6b5b83e80749cba7b090d7780b29f908f0571]
Signed-off-by: Hugo SIMELIERE (Schneider Electric) <hsimeliere.opensource@witekio.com>
---
src/helper.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/helper.c b/src/helper.c
index b9da2259..3a31e618 100644
--- a/src/helper.c
+++ b/src/helper.c
@@ -261,8 +261,8 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
data.hostname_len + data.ed_len + data.clid_len, 1))
continue;
- /* CLID into packet */
- for (p = daemon->packet, i = 0; i < data.clid_len; i++)
+ /* CLID into packet: limit to 100 bytes to avoid overflowing buffer. */
+ for (p = daemon->packet, i = 0; i < data.clid_len && i < 100; i++)
{
p += sprintf(p, "%.2x", buf[i]);
if (i != data.clid_len - 1)
--
2.43.0