UBUNTU-CVE-2026-55392

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-55392
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55392
Upstream
Published
2026-06-18T19:16:00Z
Modified
2026-06-24T11:02:00.968818231Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • 6.7 (Medium) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfssbisvalid() function fails to validate slogblocksize 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.

References

Affected packages

Ubuntu:16.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.3-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.3-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:18.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:20.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.7-1
2.2.8-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.8-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:22.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.8-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.8-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:24.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.9-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:25.10
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.11-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.11-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"
Ubuntu:26.04:LTS
nilfs-tools

Package

Name
nilfs-tools
Purl
pkg:deb/ubuntu/nilfs-tools?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.11-2
2.2.11-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nilfs-tools",
            "binary_version": "2.2.11-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55392.json"