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Debian LTS u-boot Critical Buffer Overread Signature Bypass DLA-4642-1

debian lts
Calendar Grey June 23, 2026
Dist Debian Esm H88
Debian LTS advisory details critical u-boot updates addressing information leak and signature bypass vulnerabilities in embedded systems.
Multiple issues where found in u-boot, a cross-platform bootloader for embedded systems, which could lead to information leak and signature verification bypass
Topics%20covered

Topics Covered

security advisory information leak critical signature bypass u-boot deblts

Summary

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



Severity
critical
Lowest
Low
Medium
High
Critical

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

Topics%20covered

Topics Covered

security advisory information leak critical signature bypass u-boot deblts

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