PT-2026-50777 · Unknown · Nilfs Utilities

Tristan Madani · CVE-2026-55392 · Published 2026-06-18 · Updated 2026-07-06

Positive Technologies (AI Summary)

CVSS v4.0

6.7

Medium

Base vector

AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions NILFS utilities versions prior to 2.3.1

Description The nilfs sb is valid() function fails to validate the s log block size field in the NILFS2 superblock before performing bit-shift operations. An attacker can provide crafted NILFS2 images to trigger undefined behavior via oversized shifts or out-of-memory conditions, leading to crashes in tools such as 'nilfs-tune' and 'dumpseg'.

Recommendations Update to version 2.3.1 or later.

Exploit

Fix

Weakness Enumeration

CWE-1284

Related Identifiers

CVE-2026-55392

OESA-2026-2840

OPENSUSE-SU-2026:11094-1

OPENSUSE-SU-2026:21183-1

Affected Products

Nilfs Utilities

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55392.json · Exploit
• https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9 · Patch
• https://cve.org/CVERecord?id=CVE-2026-55392 · Security Note
• https://ubuntu.com/security/CVE-2026-55392 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2840 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:21183-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-55392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55392 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-55392 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-55392 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11094-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-55392 · Vendor Advisory
• https://github.com/nilfs-dev/nilfs-utils/issues/26 · Note
• https://github.com/nilfs-dev/nilfs-utils · Note
• https://suse.com/security/cve/CVE-2026-55392 · Note