VDB

CVE-2026-55392

CVE-2026-55392 PUBLISHED CVSS 6.7 MEDIUM

Reported by VulnCheck · Published June 18, 2026

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.

Risk Scores

CVSS 4.0
6.7
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

VendorProductVersions
nilfs-devnilfs-utils0, 26efb5daff0757365101035145331b0a5a85d9d9
nilfs-devnilfs-utils0, 26efb5daff0757365101035145331b0a5a85d9d9, 0

Timeline

  • Jun 18, 2026 CVE Published
  • Jun 19, 2026 Coalition ESS Score
  • Jun 19, 2026 Security Advisory
  • Aug 7, 2026 EPSS Score
  • Aug 24, 2026 EPSS Score
  • Aug 27, 2026 EPSS Score

References

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