CVE-2026-29007: U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c)

Q: How do I fix CVE-2026-29007?

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

Q: Is CVE-2026-29007 being exploited?

CVE-2026-29007 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-2026-29007 affect?

CVE-2026-29007 affects u-boot. Severity is medium (CVSS 5.3). U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet wi

Q: How urgent is CVE-2026-29007?

Priority 41/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-29007 is a medium-severity flaw (CVSS 5.3) affecting u-boot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet with a mismatched IP total length and TCP data offset field. Attackers can send a packet with an IP total length of 40 bytes and a TCP data offset claiming 60 bytes of header to cause tcp_parse_options() to read

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-07-08
Last modified	2026-07-22

Publisher (CNA): VulnCheck · Vendor: denx

Last updated 2026-07-22 · 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
2026-07-22 18:31 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.

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-2026-29007?

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

Is CVE-2026-29007 being exploited?

CVE-2026-29007 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-2026-29007 affect?

CVE-2026-29007 affects u-boot. Severity is medium (CVSS 5.3). U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet wi

How urgent is CVE-2026-29007?

Priority 41/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-46728 HIGH 8.2 UPGRADE Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is o
CVE-2026-29009 HIGH 8.2 UPGRADE U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c)
CVE-2026-29008 HIGH 7.5 UPGRADE U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcp_rx_state_machine() function

References

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