CVE-2026-29009: U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c)

Q: How do I fix CVE-2026-29009?

u-boot: upgrade to 2026.04. Exact commands for each OS are on this page.

Q: Is CVE-2026-29009 being exploited?

CVE-2026-29009 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-29009 affect?

CVE-2026-29009 affects u-boot. Severity is high (CVSS 8.2). U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by r

Q: How urgent is CVE-2026-29009?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.2REMOTEUPGRADE

CVE-2026-29009 is a high-severity flaw (CVSS 8.2) affecting u-boot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 byt

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-07-08
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: denx

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 17:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

denx u-boot UPGRADE

Affected: < 2026.04 · 2026.04 rc1 · 2026.04 rc2 · 2026.04 rc3

Fixed in: 2026.04

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy u-boot || rpm -q u-boot || u-boot --version

2. UPGRADE to 2026.04 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade u-boot

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade u-boot

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Debian 12 · u-boot · NO FIX YET

Debian 13 · u-boot · NO FIX YET

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29009?

u-boot: upgrade to 2026.04. Exact commands for each OS are on this page.

Is CVE-2026-29009 being exploited?

CVE-2026-29009 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29009 affect?

CVE-2026-29009 affects u-boot. Severity is high (CVSS 8.2). U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by r

How urgent is CVE-2026-29009?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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