UBUNTU-CVE-2026-18107

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Source

https://ubuntu.com/security/CVE-2026-18107

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18107.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18107

Upstream

CVE-2026-18107

Published

2026-07-28T19:17:00Z

Modified

2026-08-06T03:08:40Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw was found in CRIU's handling of restartable sequences (rseq) during checkpoint/restore. A malicious process inside a container can register an rseq critical section that hijacks CRIU's parasite code injection during checkpoint, allowing it to spoof the process credentials saved in the checkpoint image. On restore, the container process gains elevated capabilities and zeroed UIDs/GIDs. The practical impact on Red Hat products is limited by several factors: checkpoint/restore requires root privileges (podman) or cluster-admin RBAC (OpenShift) to trigger and cannot be initiated from within the container itself; on OpenShift prior to 4.17 the feature required explicit opt-in, and on 4.17+ the kubelet checkpoint API RBAC is not configured by default; OpenShift enforces user namespaces by default for regular workloads (hostUsers is gated behind admin-only SCCs), which makes the spoofed capabilities namespace-scoped and ineffective for privilege escalation; SELinux type enforcement (container_t) blocks privilege transitions independently of capabilities; seccomp filters persist through checkpoint/restore and cannot be corrupted via the parasite; and kernel mount namespace ownership checks on RHEL 9/10 kernels prevent mount-based container escape even with spoofed capabilities.

References

Affected packages

Ubuntu:16.04:LTS / criu

Package

Name: criu
Purl: pkg:deb/ubuntu/criu?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7-2

1.7-3

1.7.2-1

1.7.2-2

1.8-2

2.*

2.0-2ubuntu1

2.0-2ubuntu2

2.0-2ubuntu3

2.6-1ubuntu1~ubuntu16.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "criu",
            "binary_version": "2.6-1ubuntu1~ubuntu16.04.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18107.json"

Ubuntu:18.04:LTS / criu

Package

Name: criu
Purl: pkg:deb/ubuntu/criu?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.4-3

3.5-2

3.6-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "criu",
            "binary_version": "3.6-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18107.json"

Ubuntu:22.04:LTS / criu

Package

Name: criu
Purl: pkg:deb/ubuntu/criu?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.14-1

3.16.1-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "criu",
            "binary_version": "3.16.1-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18107.json"

Ubuntu:26.04:LTS / criu

Package

Name: criu
Purl: pkg:deb/ubuntu/criu?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.1.1-1build1

4.2-1ubuntu1

4.2-1ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "criu",
            "binary_version": "4.2-1ubuntu2"
        },
        {
            "binary_name": "libcompel1",
            "binary_version": "4.2-1ubuntu2"
        },
        {
            "binary_name": "libcriu2",
            "binary_version": "4.2-1ubuntu2"
        },
        {
            "binary_name": "python3-pycriu",
            "binary_version": "4.2-1ubuntu2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18107.json"