Is CVE-2026-55392 actively exploited?

No active exploitation of CVE-2026-55392 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55392 be exploited remotely?

No. CVE-2026-55392 requires local access to exploit.

What is the CVSS score of CVE-2026-55392?

CVE-2026-55392 has a CVSS score of 5.5 (MEDIUM).

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MEDIUM

CVE-2026-55392

CWE-1284Published: June 18, 2026· Updated: Jun 23, 2026

5.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-55392 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.