CVE-2026-55392
NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size
- State
- Published
- Severity
- 6.7 Medium
- Published
- Jun 18, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.7 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.5 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
nilfs-utilsnilfs-dev |
|
References
- Pull Requestissue-tracking
- Patch Commitpatch
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