Out-of-bounds Read in Barebox
CVE-2026-34961
barebox prior to version 2026.04.0 contains out-of-bounds read vulnerabilities in ext4 extent parsing due to missing validation of the eh_entries field against buffer capacity in fs/ext4/ext4_common.c. Attackers can supply a malicious ext4 filesystem image via USB, SD card, or network boot to trigger heap out-of-bounds reads during boot-time filesystem parsing, potentially redirecting reads to arbitrary disk offsets.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (11.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Barebox — versions 0
- Pengutronix Barebox
Weakness classification (CWE)
References
- github.com/barebox/barebox (Product, product)
- github.com/barebox/barebox/releases/tag/v2026.04.0 (Release Notes, patch)
- www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-read (Third Party Advisory, third-party-advisory)
- y637f9qq2x.com/posts/barebox-sandbox-vulns/ (technical-description)
Frequently asked questions
- What is CVE-2026-34961?
- CVE-2026-34961 is a medium-severity vulnerability in Barebox, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2026-05-11.
- How severe is CVE-2026-34961?
- Medium severity. CVSS v3 base score is 6.2 out of 10.