CVE-2026-55392
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
In NILFS utilities through version 2.3.0, the nilfs_sb_is_valid() function fails to validate the s_log_block_size field in the NILFS2 superblock before bit-shift operations. Attackers can supply crafted NILFS2 images to trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.
Risk Assessment
The organization is exposed to denial of service (DoS) attacks via crashes of NILFS2 filesystem management tools. This can prevent filesystem administration and potentially lead to data loss.
Recommendation
Immediately update NILFS utilities to a version containing commit 26efb5d or later. If an update is not possible, avoid mounting or analyzing untrusted NILFS2 images.
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Original NVD description (English 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

