Is CVE-2026-74220 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74220 being exploited in the wild.

How severe is CVE-2026-74220?

High severity, with a CVSS score of 8.2, published 29 September 2026.

Which products and versions are affected?

Das U-Boot U-Boot before 2026.10-rc5.

Is there a fix for CVE-2026-74220?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-74220 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-74220?

Check whether you run Das U-Boot U-Boot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74220: U-Boot buffer overflow in NFS read reply handling

CVE-2026-74220 · Severity: high · CVSS 8.2 · Published 2026-09-29

U-Boot is the bootloader software that initializes hardware and loads the operating system on embedded devices. A malicious NFS (network file system) server can send specially crafted responses that overflow a memory buffer in the bootloader, crashing the device or corrupting critical memory used during boot. An attacker with control over the network or NFS server could exploit this to prevent systems from starting or gain code execution.

Technologies: Das U-Boot U-Boot. Vendors: Das U-Boot.

Quick answers

Is CVE-2026-74220 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74220 being exploited in the wild.
How severe is CVE-2026-74220?: High severity, with a CVSS score of 8.2, published 29 September 2026.
Which products and versions are affected?: Das U-Boot U-Boot before 2026.10-rc5.
Is there a fix for CVE-2026-74220?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-74220 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-74220?: Check whether you run Das U-Boot U-Boot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A signed integer handling flaw in the nfs_read_reply() function within net/nfs-common.c allows bypass of length validation on NFS READ replies, permitting out-of-bounds writes past the destination buffer. Exploitation requires network access to the bootloader during NFS boot operations and the ability to respond as a malicious NFS server. The vulnerability can result in memory corruption, denial of service, or potential code execution.

Affected products

Das U-Boot U-Boot before 2026.10-rc5

Timeline

2026-09-29: disclosed

References

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