CVE-2026-6507: Out-of-bounds Write
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).
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds write in the dnsmasq service when processing BOOTREPLY packets under the --dhcp-split-relay configuration. The flaw allows remote attackers to cause memory corruption, resulting in a crash of the dnsmasq daemon and denial of service. It affects Red Hat Enterprise Linux 10. The CVSS 3.1 score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Exploitation leads to a denial of service condition by crashing the dnsmasq daemon due to memory corruption. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-6507 for current remediation guidance. Until an official fix is available, consider disabling the --dhcp-split-relay option if feasible to mitigate exposure.
CVE-2026-6507: Out-of-bounds Write
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).
CVSS v3.1
Score 7.5high
Affected software
Red Hat
Red Hat Enterprise Linux 10
Red Hat
Red Hat Enterprise Linux 6
Red Hat
Red Hat Enterprise Linux 7
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
Red Hat
Red Hat OpenShift Container Platform 4
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds write in the dnsmasq service when processing BOOTREPLY packets under the --dhcp-split-relay configuration. The flaw allows remote attackers to cause memory corruption, resulting in a crash of the dnsmasq daemon and denial of service. It affects Red Hat Enterprise Linux 10. The CVSS 3.1 score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Exploitation leads to a denial of service condition by crashing the dnsmasq daemon due to memory corruption. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-6507 for current remediation guidance. Until an official fix is available, consider disabling the --dhcp-split-relay option if feasible to mitigate exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-04-17T11:32:04.326Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-6507","vendor":"Red Hat"}]
Threat ID: 69e22bbf82d89c981ff3d640
Added to database: 04/17/2026, 12:46:55 UTC
Last enriched: 05/28/2026, 21:21:27 UTC
Last updated: 09/14/2026, 10:01:33 UTC
Views: 187
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