This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-55392 →

DEBIAN-CVE-2026-55392

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 bef...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 nilfs-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 nilfs-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 nilfs-tools

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

References

advisory security-tracker.debian.org