Upstream information

CVE-2026-55392 at MITRE

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.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (VulnCheck) SUSE
Base Score 5.5 5.5
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector Local Local
Attack Complexity Low Low
Privileges Required None None
User Interaction Required Required
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail CNA (VulnCheck) SUSE
Base Score 6.7 6.7
Vector 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/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 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
Attack Vector Local Local
Attack Complexity Low Low
Attack Requirements None None
Privileges Required None None
User Interaction Active Active
Vulnerable System Confidentiality Impact None None
Vulnerable System Integrity Impact None None
Vulnerable System Availability Impact High High
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1268553 [IN_PROGRESS]

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
SUSE Package Hub 15 SP7
  • libnilfs0 >= 2.2.9-bp157.2.3.1
  • libnilfscleaner0 >= 2.2.9-bp157.2.3.1
  • libnilfsgc0 >= 2.2.9-bp157.2.3.1
  • nilfs-utils >= 2.2.9-bp157.2.3.1
  • nilfs-utils-devel >= 2.2.9-bp157.2.3.1
 Patchnames:
openSUSE-2026-228
openSUSE Leap 16.0
  • libnilfs0 >= 2.2.9-bp160.2.1
  • libnilfscleaner0 >= 2.2.9-bp160.2.1
  • libnilfsgc0 >= 2.2.9-bp160.2.1
  • nilfs-utils >= 2.2.9-bp160.2.1
  • nilfs-utils-devel >= 2.2.9-bp160.2.1
 Patchnames:
openSUSE-Leap-16.0-packagehub-378
openSUSE Tumbleweed
  • libnilfs3 >= 2.3.1-1.1
  • libnilfsgc3 >= 2.3.1-1.1
  • nilfs-utils >= 2.3.1-1.1
  • nilfs-utils-devel >= 2.3.1-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-11094

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Package Hub 15 SP7 nilfs-utils Released

SUSE Timeline for this CVE

CVE page created: Thu Jun 18 22:01:40 2026
CVE page last modified: Tue Jul 7 11:36:48 2026