CVE-2026-55392
NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 6.7EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado
Lifecycle
18 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
nilfs-dev · nilfs-utilsWant to know if your infrastructure is exposed to this?
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