[Filesystems-devel] Bug#1140362: nilfs-tools: CVE-2026-55392

[Salvatore Bonaccorso]

Source: nilfs-tools
Version: 2.2.11-2
Severity: important
Tags: security upstream
Forwarded: https://github.com/nilfs-dev/nilfs-utils/issues/26
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for nilfs-tools.

CVE-2026-55392[0]:
| NILFS utilities through 2.3.0, fixed in commit 26efb5d,
| nilfs_sb_is_valid() function fails to validate s_log_block_size
| field in NILFS2 superblock before bit-shift operations. Attackers
| supplying crafted NILFS2 images trigger undefined behavior through
| oversized shifts or out-of-memory conditions, crashing tools like
| nilfs-tune and dumpseg.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-55392
    https://www.cve.org/CVERecord?id=CVE-2026-55392
[1] https://github.com/nilfs-dev/nilfs-utils/issues/26

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore