CVE-2026-34961
barebox ext4 Extent Parsing Out-of-Bounds Read
Description
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.
INFO
Published Date :
May 11, 2026, 10:22 p.m.
Last Modified :
May 13, 2026, 7:57 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Barebox to version 2026.04.0 or later.
- Avoid booting from untrusted filesystem images.
- Validate ext4 filesystem integrity before booting.
- Review ext4 extent parsing logic for security.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34961.
| URL | Resource |
|---|---|
| https://github.com/barebox/barebox | Product |
| https://github.com/barebox/barebox/releases/tag/v2026.04.0 | Release Notes |
| https://www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-read | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34961 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34961
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34961 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34961 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:* versions up to (excluding) 2026.04.0 Added Reference Type VulnCheck: https://github.com/barebox/barebox Types: Product Added Reference Type VulnCheck: https://github.com/barebox/barebox/releases/tag/v2026.04.0 Types: Release Notes Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-read Types: Third Party Advisory -
New CVE Received by [email protected]
May. 11, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-125 Added Reference https://github.com/barebox/barebox Added Reference https://github.com/barebox/barebox/releases/tag/v2026.04.0 Added Reference https://www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-read