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Red Hat Enterprise Linux 10 CVE-2026-6507

| EUVDEUVD-2026-23419 HIGH
Out-of-bounds Write (CWE-787)
2026-04-17 redhat GHSA-28hj-3gj2-63m5
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 17, 2026 - 15:37 vuln.today
v4 (cvss_changed)
Analysis Updated
Apr 17, 2026 - 13:27 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 17, 2026 - 13:22 vuln.today
cvss_changed
Analysis Generated
Apr 17, 2026 - 12:56 vuln.today
EUVD ID Assigned
Apr 17, 2026 - 12:45 euvd
EUVD-2026-23419
Analysis Generated
Apr 17, 2026 - 12:45 vuln.today
CVE Published
Apr 17, 2026 - 12:23 nvd
HIGH 7.5

DescriptionCVE.org

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).

AnalysisAI

Out-of-bounds write in dnsmasq's DHCP split-relay handler allows remote unauthenticated denial of service via crafted BOOTREPLY packets. Affects Red Hat Enterprise Linux 6-10 and OpenShift Container Platform 4 when dnsmasq runs with the --dhcp-split-relay option enabled. CVSS 7.5 (AV:N/AC:L/PR:N/UI:N) indicates trivial network exploitation, but real-world risk is mitigated by the non-default configuration requirement. No public exploit or active exploitation (CISA KEV) confirmed at time of analysis, though CWE-787 (out-of-bounds write) primitives are well-understood by attackers.

Technical ContextAI

dnsmasq is a lightweight DNS forwarder and DHCP server widely deployed in Linux distributions, embedded systems, and container platforms. The vulnerability (CWE-787: Out-of-bounds Write) resides in the DHCP split-relay feature, which separates DHCP client and server communications across network segments. When --dhcp-split-relay is configured, dnsmasq processes BOOTREPLY packets from upstream DHCP servers. Insufficient bounds checking on attacker-controlled fields in these packets allows writing beyond allocated memory regions, corrupting heap or stack structures. Red Hat CPE data confirms impact across RHEL 6, 7, 8, 9, 10, and OpenShift Container Platform 4, indicating the vulnerable code exists in dnsmasq versions shipped with these platforms since at least RHEL 6 (circa 2010). The Bootstrap Protocol (BOOTP) is the predecessor to DHCP (RFC 951), and BOOTREPLY packets follow fixed 300-byte structures with variable-length vendor extensions-likely the manipulation vector.

RemediationAI

Apply vendor patches from Red Hat security advisories (track via https://access.redhat.com/security/cve/CVE-2026-6507 and Bugzilla 2459181). At time of analysis, Red Hat has not published RHSA (Red Hat Security Advisory) numbers or fixed package versions-monitor the CVE page for updates. For RHEL systems, patched dnsmasq RPMs will be delivered through standard 'yum update dnsmasq' or 'dnf update dnsmasq' channels once released. Interim mitigation for high-risk environments: disable --dhcp-split-relay if not operationally required (edit /etc/dnsmasq.conf or relevant drop-in files in /etc/dnsmasq.d/, remove or comment the dhcp-split-relay directive, restart dnsmasq service). Trade-off: disabling split-relay breaks DHCP relay functionality for segmented networks, requiring architecture changes (direct DHCP server access or alternative relay agents like dhcrelay). Network-level compensating control: restrict BOOTREPLY packet sources to trusted upstream DHCP servers via firewall rules (iptables/nftables) on UDP port 67/68, though this assumes attacker cannot spoof trusted server IPs. Verify configuration with 'dnsmasq --test' before restart to avoid service disruption.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

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CVE-2026-6507 vulnerability details – vuln.today

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