RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-347.
Summary
RAUC controls the update process on embedded Linux systems. Prior to version 1.15.2, RAUC bundles using the 'plain' format exceeding a payload size of 2 GiB cause an integer overflow which results in a signature which covers only the first few bytes of the payload. Given such a bundle with a legitimate signature, an attacker can modify the part of the payload which is not covered by the signature. This issue has been patched in version 1.15.2.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| rauc | rauc | before 1.15.2 | 1.15.2 | Patch available | CNA |
- rauc Vendorrauc Affected before 1.15.2 Fixed in 1.15.2 Patch available CNA
Remediation
- Fix · CNA rauc (rauc) Fixed in 1.15.2
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34155
References
More barebox Rauc vulnerabilities
- TI-2020-15849 Time-of-check time-of-use race condition in Pengutronix RAUC CVSS 3.1MEDIUM 6.6
Sources
- CVE-2026-34155 · CVE Program
- CVE-2026-34155 · NVD
- FIRST EPSS
- CVE-2026-34155 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences