CVE-2026-55392
Medium · 5.5CVSS
5.5
EPSS
0.2%
Published
Jun 18, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | nilfs-utils | 0 | 2.2.9-bp160.2.1 |
| openSUSE:Tumbleweed | nilfs-utils | 0 | 2.3.1-1.1 |
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