What’s Vulnerable › Vulnerabilities

CVE-2026-88833: Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-16
• Weakness: CWE-191

Description

A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.

Affected products

• Red Hat Hardened Images: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-88833
• https://bugzilla.redhat.com/show_bug.cgi?id=2531347

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