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dnsmasq: fix CVE-2026-5172

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A buffer overflow in dnsmasq’s extract_addresses() function allows
an attacker to trigger a heap out-of-bounds read and crash by
exploiting a malformed DNS response, enabling extract_name()
to advance the pointer past the record’s end.

Reference:
[ https://nvd.nist.gov/vuln/detail/CVE-2026-5172 ]

Signed-off-by: Abhishek Bachiphale <Abhishek.Bachiphale@windriver.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
This commit is contained in:
Abhishek Bachiphale
2026-05-18 22:43:36 +05:30
committed by Khem Raj
parent b4c4853624
commit 44c8962f48
2 changed files with 35 additions and 0 deletions
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meta-networking/recipes-support/dnsmasq/dnsmasq_2.92.bb
+1
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@@ -20,6 +20,7 @@ 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] = "fd908e79ff37f73234afcb6d3363f78353e768703d92abd8e3220ade6819b1e1"
meta-networking/recipes-support/dnsmasq/files/CVE-2026-5172.patch
+34
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@@ -0,0 +1,34 @@
commit fa3c8ddef6712b52f562813317e6a997e1210123
Author: Simon Kelley <simon@thekelleys.org.uk>
Date: Mon Mar 30 16:24:33 2026 +0100
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: Abhishek Bachiphale <Abhishek.Bachiphale@windriver.com>
diff --git a/src/rfc1035.c b/src/rfc1035.c
index f0e1082..7e05fb5 100644
--- a/src/rfc1035.c
+++ b/src/rfc1035.c
@@ -943,7 +943,8 @@ 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, EXTR_NAME_EXTRACT, 0))
+ /* rdlen may lie, and extract_name() advances p1 past where it says the record ends. */
+ if (!extract_name(header, qlen, &p1, name, EXTR_NAME_EXTRACT, 0) || (p1 > endrr))
{
blockdata_free(addr.rrblock.rrdata);
return 2;