Buffer Overflow vulnerability in the net/bootp.c in DENEX U-Boot from its initial commit in 2002 (3861aa5) up to today on any platform allows an attacker on the local network to leak memory from four up to 32 bytes of memory stored behind the packet to the network depending on the later use of DHCP-provided parameters via crafted DHCP responses.

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4642 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4642-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Andreas Henriksson     June 23, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : u-boot     Version        : 2021.01+dfsg-5+deb11u3 2023.01+dfsg-2+deb12u3     CVE ID         : CVE-2024-42040 CVE-2026-46728     Debian Bug     : 1081557 1136954

    Multiple issues where found in u-boot, a cross-platform bootloader for     embedded systems, which could lead to information leak and signature     verification bypass.

    CVE-2024-42040

        buffer overread vulnerability in the DHCP implementation

    CVE-2026-46728

        mishandles use of unit addresses in a FIT

    For Debian 11 bullseye, these problems have been fixed in version     2021.01+dfsg-5+deb11u3.

    For Debian 12 bookworm, these problems have been fixed in version     2023.01+dfsg-2+deb12u3.

    We recommend that you upgrade your u-boot packages.

    For the detailed security status of u-boot please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/u-boot

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016520 advisory.

    Buffer Overflow vulnerability in the net/bootp.c in DENEX U-Boot from its initial commit in 2002 (3861aa5)     up to today on any platform allows an attacker on the local network to leak memory from four up to 32     bytes of memory stored behind the packet to the network depending on the later use of DHCP-provided     parameters via crafted DHCP responses.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Buffer Overflow vulnerability in the net/bootp.c in DENEX U-Boot from its initial commit in 2002 (3861aa5)     up to today on any platform allows an attacker on the local network to leak memory from four up to 32     bytes of memory stored behind the packet to the network depending on the later use of DHCP-provided     parameters via crafted DHCP responses. (CVE-2024-42040)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
322326	Debian dla-4642 : u-boot - security update	Nessus	Debian Local Security Checks	high
313081	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: uboot-tools (UTSA-2026-016520)	Nessus	Unity Linux Local Security Checks	high
229353	Linux Distros Unpatched Vulnerability : CVE-2024-42040	Nessus	Misc.	high

Detections

Analytics

CVE-2024-42040

high

Tenable Plugins

high

high

high