Improper signature verification in Das U-Boot
Priority LOW 31CWE-347Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-347.
Summary
An exploitable vulnerability exists in the verified boot protection of the Das U-Boot from version 2013.07-rc1 to 2014.07-rc2. The affected versions lack proper FIT signature enforcement, which allows an attacker to bypass U-Boot's verified boot and execute an unsigned kernel, embedded in a legacy image format. To trigger this vulnerability, a local attacker needs to be able to supply the image to boot.
Why it matters now
EPSS 0.00276 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Das U-Boot | Das U-Boot 2013.07-rc1 to 2014.07-rc2 OCTEON-SDK 3.1.2 to 5.1 CUJO Smart Firewall - Firmware version 7003 | — | No fix listed | CNA |
- Das U-Boot Vendor— Affected Das U-Boot 2013.07-rc1 to 2014.07-rc2 OCTEON-SDK 3.1.2 to 5.1 CUJO Smart Firewall - Firmware version 7003 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:* | 2013.07 – 2014.07 | Vulnerable | u-boot |
| cpe:2.3:a:denx:u-boot:2013.07:rc1:*:*:*:*:*:* | 2013.07 rc1 | Vulnerable | u-boot |
| cpe:2.3:a:denx:u-boot:2013.07:rc2:*:*:*:*:*:* | 2013.07 rc2 | Vulnerable | u-boot |
| cpe:2.3:a:denx:u-boot:2013.07:rc3:*:*:*:*:*:* | 2013.07 rc3 | Vulnerable | u-boot |
| cpe:2.3:a:denx:u-boot:2014.07:rc1:*:*:*:*:*:* | 2014.07 rc1 | Vulnerable | u-boot |
| cpe:2.3:a:denx:u-boot:2014.07:rc2:*:*:*:*:*:* | 2014.07 rc2 | Vulnerable | u-boot |
- cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:* Versions 2013.07 – 2014.07 Vulnerable ·u-boot
- cpe:2.3:a:denx:u-boot:2013.07:rc1:*:*:*:*:*:* Versions 2013.07 rc1 Vulnerable ·u-boot
- cpe:2.3:a:denx:u-boot:2013.07:rc2:*:*:*:*:*:* Versions 2013.07 rc2 Vulnerable ·u-boot
- cpe:2.3:a:denx:u-boot:2013.07:rc3:*:*:*:*:*:* Versions 2013.07 rc3 Vulnerable ·u-boot
- cpe:2.3:a:denx:u-boot:2014.07:rc1:*:*:*:*:*:* Versions 2014.07 rc1 Vulnerable ·u-boot
- cpe:2.3:a:denx:u-boot:2014.07:rc2:*:*:*:*:*:* Versions 2014.07 rc2 Vulnerable ·u-boot
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-3968
- 2026-10-03 Alias added: GHSA-xjmf-xr2j-gfx7
References
More U-boot vulnerabilities
- TI-2022-02168 Unchecked Download size in Uboot CVSS 3.1HIGH 7.7
- TI-2025-28794 A lack of signature verification in the bootloader of DENX Software Engineering Das… CVSS 3.1MEDIUM 6.5
- TI-2020-06770 In Das U-Boot through 2020.01, a double free has been found in the cmd/gpt.c… CVSS 3.1CRITICAL 9.8
- TI-2022-12898 nfs_lookup_reply in net/nfs.c in Das U-Boot through 2022.04 (and through 2022.07-rc2) has… CVSS 3.1CRITICAL 9.8
- TI-2019-10569 An issue was discovered in Das U-Boot through 2019.07. CVSS 3.0CRITICAL 9.8
- TI-2019-10568 An issue was discovered in Das U-Boot through 2019.07. CVSS 3.0CRITICAL 9.8
Sources
- CVE-2018-3968 · CVE Program
- CVE-2018-3968 · NVD
- FIRST EPSS
- GHSA-xjmf-xr2j-gfx7 · GitHub Advisory Database · CC BY 4.0
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