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Vulnerability record · CVE-2026-34962 · published 11 May 2026

CVE-2026-34962: Pengutronix barebox vulnerability

Pengutronix · Barebox

barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/ext4/ext4_common.c where the ext4fs_iterate_dir() function fails to validate that directory entry length values are non-zero. Attackers can supply a malicious ext4 filesystem image with a crafted directory entry containing a direntlen value of 0 to cause an infinite loop during directory listing or path resolution, resulting in the boot process hanging indefinitely.

6.9 CVSS 4.0 Medium EPSS 0.18% · top 93.0% CWE-835 · CWE-835
6.9CVSS 4.0 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
18 Jul 2026Last modified by NVD

Description

barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/ext4/ext4_common.c where the ext4fs_iterate_dir() function fails to validate that directory entry length values are non-zero. Attackers can supply a malicious ext4 filesystem image with a crafted directory entry containing a direntlen value of 0 to cause an infinite loop during directory listing or path resolution, resulting in the boot process hanging indefinitely.

CVSS:4.0/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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-directory-parsing-infinite-loop-denial-of-service Third Party Advisory
https://y637f9qq2x.com/posts/barebox-sandbox-vulns/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-15937Pengutronix barebox out-of-bounds write vulnerabilityPengutronix barebox through 2019.08.1 has a remote buffer overflow in nfs_readlink_reply in net/nfs.c because a length field is directly used for a m…EPSS 2.1%9.8CVE-2019-15938Pengutronix barebox out-of-bounds write vulnerabilityPengutronix barebox through 2019.08.1 has a remote buffer overflow in nfs_readlink_req in fs/nfs.c because a length field is directly used for a memc…EPSS 2.1%9.1CVE-2020-13910Pengutronix barebox out-of-bounds read vulnerabilityPengutronix Barebox through v2020.05.0 has an out-of-bounds read in nfs_read_reply in net/nfs.c because a field of an incoming network packet is dire…EPSS 1.2%8.6CVE-2026-34963Pengutronix barebox integer overflow vulnerabilitybarebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in …EPSS 0.22%8.2CVE-2026-33243Pengutronix barebox insufficient verification of data authenticity vulnerabilitybarebox is a bootloader. In barebox from version 2016.03.0 to before version 2026.03.1 (and the corresponding backport to 2025.09.3), an attacker cou…EPSS 0.12%7.5CVE-2021-37847Pengutronix barebox vulnerabilitycrypto/digest.c in Pengutronix barebox through 2021.07.0 leaks timing information because memcmp is used during digest verification.EPSS 1.5%7.5CVE-2021-37848Pengutronix barebox observable discrepancy vulnerabilitycommon/password.c in Pengutronix barebox through 2021.07.0 leaks timing information because strncmp is used during hash comparison.EPSS 1.5%7.1CVE-2026-34960Pengutronix barebox out-of-bounds read vulnerabilitybarebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within the dhcp_message_type() function that f…EPSS 0.38%

Source: NIST National Vulnerability Database (record CVE-2026-34962), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.