CVE-2026-29007VulnerabilityPublished 8 Jul 2026Updated 21 Oct 2026

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

Affects u-bootSource GCVE Database

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Not known to be exploited · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10u-boot`pkg:deb/ubuntu/u-boot?arch=source&distro=stonking`Other threats	Affected 2025.10-0ubuntu2 – 2025.10-0ubuntu6 5 affected builds	Fixed in–
Ubuntu 26.04 LTSu-boot`pkg:deb/ubuntu/u-boot?arch=source&distro=resolute`Other threats	Affected 2025.01-3ubuntu4 – 2025.10-0ubuntu2.2 5 affected builds	Fixed in–
Ubuntu 25.10u-boot`pkg:deb/ubuntu/u-boot?arch=source&distro=questing`Other threats	Affected 2025.01-1~0ubuntu2 – 2025.10-0ubuntu0.25.10.1 5 affected builds	Fixed in–
Ubuntu 24.04 LTSu-boot`pkg:deb/ubuntu/u-boot?arch=source&distro=noble`Other threats	Affected 2023.07+dfsg-1ubuntu2 – 2025.10-0ubuntu0.24.04.4 14 affected builds	Fixed in–
Ubuntu 24.04 LTSu-boot-nezha`pkg:deb/ubuntu/u-boot-nezha?arch=source&distro=noble`Other threats	Affected 2022.10-1089-g528ae9bc6c-0ubuntu2 – 2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2 4 affected builds	Fixed in–
Ubuntu 22.04 LTSu-boot`pkg:deb/ubuntu/u-boot?arch=source&distro=jammy`Other threats	Affected 2021.07+dfsg-0ubuntu8 – 2022.01+dfsg-2ubuntu2.9 13 affected builds	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a patch is available, users should consider disabling CONFIG_PROT_TCP if feasible to mitigate exposure. Monitor vendor communications for updates on official fixes.

Description

U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in the tcp_rx_state_machine() function when CONFIG_PROT_TCP is enabled. This flaw allows remote attackers to craft malicious TCP packets with mismatched IP total length and TCP data offset fields, causing the system to read beyond TCP segment boundaries. The vulnerability can corrupt TCP connection state variables, potentially disrupting TCP window calculations. The CVSS v3.1 base score is 5.3, indicating medium severity. No known exploits are reported in the wild. The vulnerability affects multiple specific U-Boot versions as listed.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 17 Sep 2026, 18:35 UTC

Technical details

References

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