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[USN-8930-2] U-Boot vulnerabilities

Posted on 21 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8930-2
October 21, 2026

u-boot vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.10

Summary:

Several security issues were fixed in U-Boot.

Software Description:
- u-boot: A boot loader for embedded systems

Details:

USN-8930-1 fixed some vulnerabilities in U-Boot. This update provides the
corresponding fix for U-Boot on Ubuntu 26.10.

Original advisory details:

Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot
incorrectly handled certain NFS READ and NFS READLINK responses. An
attacker could possibly use this issue to trigger a buffer overflow,
resulting in a denial of service or arbitrary code execution.
(CVE-2026-74220, CVE-2026-74221)

Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot
incorrectly handled certain HTTP data storage failures in its lwIP
implementation. An attacker could possibly use this issue to trigger a
use-after-free, resulting in a denial of service. (CVE-2026-74222)

Shahriyar Jalayeri and Mehrun P. Hunter discovered that U-Boot did not
properly validate certain DHCPv6 option lengths during network boot. An
attacker could possibly use this issue to trigger out-of-bounds memory
access, resulting in a denial of service. (CVE-2026-74225)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.10
u-boot-imx 2025.10-0ubuntu6
u-boot-qemu 2025.10-0ubuntu6
u-boot-tools 2025.10-0ubuntu6

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8930-2
https://ubuntu.com/security/notices/USN-8930-1
CVE-2026-74220, CVE-2026-74221, CVE-2026-74222, CVE-2026-74225

Package Information:
https://launchpad.net/ubuntu/+source/u-boot/2025.10-0ubuntu6

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