UBUNTU-CVE-2026-54904

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Source
https://ubuntu.com/security/CVE-2026-54904
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54904
Upstream
Published
2026-06-24T17:17:00Z
Modified
2026-06-29T13:56:54.632629467Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compareandset(oldvalue, newvalue) succeeds; Numeric compareandset, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a result, once an AtomicReference contains Float::NAN, calling #update repeatedly evaluates the caller's block and never returns. In services that store externally derived numeric values in an AtomicReference, this can cause CPU exhaustion or permanent request/job hangs. This vulnerability is fixed in 1.3.7.

References

Affected packages

Ubuntu:16.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.0.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.0.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:18.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.0.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.0.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:20.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.0.5-3
1.0.5-4
1.1.6+dfsg-2
1.1.6+dfsg-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.1.6+dfsg-3"
        },
        {
            "binary_name": "ruby-concurrent-ext",
            "binary_version": "1.1.6+dfsg-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:22.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.1.6+dfsg-3
1.1.6+dfsg-3build1
1.1.6+dfsg-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.1.6+dfsg-4"
        },
        {
            "binary_name": "ruby-concurrent-ext",
            "binary_version": "1.1.6+dfsg-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:24.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.1.6+dfsg-5build2
1.1.6+dfsg-5build3
1.2.3-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.2.3-2build1"
        },
        {
            "binary_name": "ruby-concurrent-ext",
            "binary_version": "1.2.3-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:25.10
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.3.4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.3.4-1"
        },
        {
            "binary_name": "ruby-concurrent-ext",
            "binary_version": "1.3.4-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"
Ubuntu:26.04:LTS
ruby-concurrent

Package

Name
ruby-concurrent
Purl
pkg:deb/ubuntu/ruby-concurrent?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.3.4-1
1.3.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-concurrent",
            "binary_version": "1.3.6-1"
        },
        {
            "binary_name": "ruby-concurrent-ext",
            "binary_version": "1.3.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54904.json"