CVE-2026-34961: barebox prior to version 2026.04.0 contains out-of-bounds read vulnerabilities in ext4 extent parsing due to m

Q: How do I fix CVE-2026-34961?

barebox: upgrade to 2026.04.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-34961 being exploited?

CVE-2026-34961 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34961 affect?

CVE-2026-34961 affects barebox. Severity is medium (CVSS 6.2). 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

Q: How urgent is CVE-2026-34961?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.2UPGRADE

CVE-2026-34961 is a medium-severity flaw (CVSS 6.2) affecting barebox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-05-11
Last modified	2026-07-18

Publisher (CNA): VulnCheck · Vendor: pengutronix

Last updated 2026-07-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 22:22 UTCPublished CVE record published
2026-07-18 03:16 UTCUpdated Record last modified

pengutronix barebox UPGRADE

Affected: < 2026.04.0

Fixed in: 2026.04.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy barebox || rpm -q barebox || barebox --version

2. UPGRADE to 2026.04.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade barebox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade barebox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34961?

barebox: upgrade to 2026.04.0. Exact commands for each OS are on this page.

Is CVE-2026-34961 being exploited?

CVE-2026-34961 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34961 affect?

CVE-2026-34961 affects barebox. Severity is medium (CVSS 6.2). 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

How urgent is CVE-2026-34961?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34963 HIGH 8.4 UPGRADE barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi
CVE-2026-34962 MEDIUM 6.2 UPGRADE barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/
CVE-2026-34960 MEDIUM 6.5 UPGRADE barebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within

References

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