Is CVE-2026-29009 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-29009 being exploited in the wild.

How severe is CVE-2026-29009?

High severity, with a CVSS score of 8.2, published 8 July 2026.

Which products and versions are affected?

u-boot project U-Boot through 2026.04-rc3.

Is there a fix for CVE-2026-29009?

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-2026-29009 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-29009?

Check whether anything you run is named in the advisory. 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-2026-29009: U-Boot buffer overflow in nfs_readlink_reply

CVE-2026-29009 · Severity: high · CVSS 8.2 · Published 2026-07-08

U-Boot is an open-source bootloader used to initialize hardware and start the operating system on various devices. A vulnerability in its network file sharing (NFS) component allows a malicious or compromised server to crash the device or take control of its network state during the boot process. This could lead to a complete denial of service or allow an attacker to redirect the device's network traffic.

Quick answers

Is CVE-2026-29009 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-29009 being exploited in the wild.
How severe is CVE-2026-29009?: High severity, with a CVSS score of 8.2, published 8 July 2026.
Which products and versions are affected?: u-boot project U-Boot through 2026.04-rc3.
Is there a fix for CVE-2026-29009?: 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-2026-29009 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-29009?: Check whether anything you run is named in the advisory. 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 classic buffer overflow (CWE-120) exists in the nfs_readlink_reply() function within net/nfs-common.c. The vulnerability occurs because the code fails to perform cumulative length validation when appending multiple relative symlink targets to the 2048-byte nfs_path_buff buffer. An attacker controlling an NFS server can send multiple READLINK responses (e.g., two responses of ~1100 bytes each) to overflow the buffer and corrupt adjacent BSS variables such as nfs_server_ip, nfs_server_port, and rpc_id. This allows for memory corruption and potential manipulation of the NFS client state machine. The issue is present in versions up to 2026.04-rc3 when the NFS command is enabled.

Affected products

u-boot project U-Boot through 2026.04-rc3

Timeline

2026-05-08: other: Coordinated disclosure process initiated by VulnCheck
2026-07-08: advisory: CVE-2026-29009 published

References

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