From: "Hugo SIMELIERE (Schneider Electric)" <[email protected]>
Pick patch from [1] dnsmasq 2.90 debian bookworm pacthes. [1] https://sources.debian.org/src/dnsmasq/2.90-4~deb12u2/debian/patches/CVE-2026-5172.patch Signed-off-by: Hugo SIMELIERE (Schneider Electric) <[email protected]> Reviewed-by: Bruno VERNAY <[email protected]> --- .../recipes-support/dnsmasq/dnsmasq_2.90.bb | 1 + .../dnsmasq/files/CVE-2026-5172.patch | 39 +++++++++++++++++++ 2 files changed, 40 insertions(+) create mode 100644 meta-networking/recipes-support/dnsmasq/files/CVE-2026-5172.patch diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq_2.90.bb b/meta-networking/recipes-support/dnsmasq/dnsmasq_2.90.bb index 3f06bbb6cf..3e8a808065 100644 --- a/meta-networking/recipes-support/dnsmasq/dnsmasq_2.90.bb +++ b/meta-networking/recipes-support/dnsmasq/dnsmasq_2.90.bb @@ -21,6 +21,7 @@ SRC_URI = "http://www.thekelleys.org.uk/dnsmasq/${@['archive/', ''][float(d.getV file://CVE-2026-4891.patch \ file://CVE-2026-4892.patch \ file://CVE-2026-4893.patch \ + file://CVE-2026-5172.patch \ " SRC_URI[sha256sum] = "8f6666b542403b5ee7ccce66ea73a4a51cf19dd49392aaccd37231a2c51b303b" diff --git a/meta-networking/recipes-support/dnsmasq/files/CVE-2026-5172.patch b/meta-networking/recipes-support/dnsmasq/files/CVE-2026-5172.patch new file mode 100644 index 0000000000..58aac87e4e --- /dev/null +++ b/meta-networking/recipes-support/dnsmasq/files/CVE-2026-5172.patch @@ -0,0 +1,39 @@ +From f158664062e049ec4604f6e772551a00575011f4 Mon Sep 17 00:00:00 2001 +From: Simon Kelley <[email protected]> +Date: Mon, 30 Mar 2026 16:24:33 +0100 +Subject: [PATCH] Fix buffer overflow vulnerability in extract_addresses() + CVE-2026-5172 + +Thanks to Hugo Martinez Ray for spotting this. + +The value of rdlen for an RR can be a lie, allowing the +call to extract_name() at rfc1025.c:952 to advance the value of p1 +past the calculated end of the record. The makes the calculation +of bytes remaining in the RR underflow to a huge number and results +in a massive heap OOB read and certain crash. + +CVE: CVE-2026-5172 +Upstream-Status: Backport [https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=073082ddc0aba7b8efa15a688d6183463b65effa] + +Signed-off-by: Hugo SIMELIERE (Schneider Electric) <[email protected]> +--- + src/rfc1035.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/src/rfc1035.c b/src/rfc1035.c +index 387d894a..32dc5711 100644 +--- a/src/rfc1035.c ++++ b/src/rfc1035.c +@@ -932,7 +932,8 @@ int extract_addresses(struct dns_header *header, size_t qlen, char *name, time_t + /* Name, extract it then re-encode. */ + int len; + +- if (!extract_name(header, qlen, &p1, name, 1, 0)) ++ /* rdlen may lie, and extract_name() advances p1 past where it says the record ends. */ ++ if (!extract_name(header, qlen, &p1, name, 1, 0) || (p1 > endrr)) + { + blockdata_free(addr.rrblock.rrdata); + return 2; +-- +2.43.0 + -- 2.43.0
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