Unrated severityNVD Advisory· Published Jun 18, 2026· Updated Jun 18, 2026
NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size
CVE-2026-55392
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.
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Affected products
2- Range: <=2.3.0
Patches
Vulnerability mechanics
References
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