Summary
[2.90-7]
- Prevent overflow in extract_name function (CVE-2026-2291)
- Prevent DoS in DNSSEC validation (CVE-2026-4890)
- Prevent out-of-bounds read in DNSSEC validation (CVE-2026-4891)
- Prevent out-of-bounds write in DHCPv6 server (CVE-2026-4892)
- Prevent source check avoidance by RFC 7871 client-subnet (CVE-2026-4893)
- Prevent out-of-bounds read in extract_addresses (CVE-2026-5172)
[2.90-6]
- Prevent heap buffer overflow in cache via NAME_ESCAPE expansion
(CVE-2026-2291)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Oracle Linux · 10 | dnsmasq | 0:2.90-7.el10_2 |
| Oracle Linux · 10 | dnsmasq-utils | 0:2.90-7.el10_2 |
Vulnerabilities 6
-
High 8.4
CVE-2026-4892
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
-
High 7.5
CVE-2026-4890
A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
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High 7.3CVE-2026-2291 Public exploit
CVE-2026-2291
dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.
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High 7.3CVE-2026-5172 Public exploit
CVE-2026-5172
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.
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Medium 5.3
CVE-2026-4891
A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
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Medium 5.3CVE-2026-4893 Public exploit
CVE-2026-4893
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.