CVE-2026-88833

CVSS 6.5 (medium) · published 2026-10-13

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.

Weakness: CWE-191

Source: NVD CVE-2026-88833

References

• https://access.redhat.com/errata/RHSA-2026:99577
• https://access.redhat.com/security/cve/CVE-2026-88833
• https://bugzilla.redhat.com/show_bug.cgi?id=2531347

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