| Name | CVE-2026-6507 |
| Description | A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS). |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1134264 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| dnsmasq (PTS) | bullseye | 2.85-1 | fixed |
| bullseye (security) | 2.85-1+deb11u1 | fixed | |
| bookworm | 2.90-4~deb12u1 | fixed | |
| trixie | 2.91-1 | fixed | |
| forky, sid | 2.92-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| dnsmasq | source | bullseye | (not affected) | |||
| dnsmasq | source | bookworm | (not affected) | |||
| dnsmasq | source | trixie | (not affected) | |||
| dnsmasq | source | (unstable) | 2.92-4 | 1134264 |
[trixie] - dnsmasq <not-affected> (Vulnerable code introduced later)
[bookworm] - dnsmasq <not-affected> (Vulnerable code introduced later)
[bullseye] - dnsmasq <not-affected> (Vulnerable code introduced later)
https://bugzilla.redhat.com/show_bug.cgi?id=2459181
Introduced with: https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=1677c6e10b81d4e1181e3a3f88e738ea6d69be8a (v2.92test20)
Fixed by: https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=9ad74926d4f7f34ff902e1db5235535aa813c33f (v2.93test9)