DEBIAN-CVE-2026-18107
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.
DEBIAN-CVE-2026-18107
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-18107
criu
Source reference: /affected/0/package/name
- Affected versions
- 3.17.1-2
Source reference:
/affected/0/versions3.17.1-2+deb12u1Source reference:
/affected/0/versions3.17.1-2+deb12u2Source reference:
/affected/0/versions3.17.1-3Source reference:
/affected/0/versions3.19-1Source reference:
/affected/0/versions3.19-2Source reference:
/affected/0/versions3.19-3Source reference:
/affected/0/versions3.19-4Source reference:
/affected/0/versions3.19-5Source reference:
/affected/0/versions3.19-6Source reference:
/affected/0/versions3.19-7Source reference:
/affected/0/versions4.0-1Source reference:
/affected/0/versions4.0-1~exp1Source reference:
/affected/0/versions4.0-2Source reference:
/affected/0/versions4.0-3Source reference:
/affected/0/versions4.0-4Source reference:
/affected/0/versions4.1-1Source reference:
/affected/0/versions4.1-1~exp1Source reference:
/affected/0/versions4.1.1-1Source reference:
/affected/0/versions4.1.1-2Source reference:
/affected/0/versions4.1.1-2~exp1Source reference:
/affected/0/versions4.1.1-3Source reference:
/affected/0/versions4.2-1Source reference:
/affected/0/versions4.2-2Source reference:
/affected/0/versions4.2-3Source reference:
/affected/0/versions4.2-4Source reference:
/affected/0/versions4.2-5Source reference:
/affected/0/versions4.2-6Source reference:
/affected/0/versions4.2.1-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
criu
Source reference: /affected/1/package/name
- Affected versions
- 4.1.1-1
Source reference:
/affected/1/versions4.1.1-2Source reference:
/affected/1/versions4.1.1-2~exp1Source reference:
/affected/1/versions4.1.1-3Source reference:
/affected/1/versions4.2-1Source reference:
/affected/1/versions4.2-2Source reference:
/affected/1/versions4.2-3Source reference:
/affected/1/versions4.2-4Source reference:
/affected/1/versions4.2-5Source reference:
/affected/1/versions4.2-6Source reference:
/affected/1/versions4.2.1-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
criu
Source reference: /affected/2/package/name
- Affected versions
- 4.1.1-1
Source reference:
/affected/2/versions4.1.1-2Source reference:
/affected/2/versions4.1.1-2~exp1Source reference:
/affected/2/versions4.1.1-3Source reference:
/affected/2/versions4.2-1Source reference:
/affected/2/versions4.2-2Source reference:
/affected/2/versions4.2-3Source reference:
/affected/2/versions4.2-4Source reference:
/affected/2/versions - Fixed versions
- 4.2-5
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "criu",
"purl": "pkg:deb/debian/criu?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.17.1-2",
"3.17.1-2+deb12u1",
"3.17.1-2+deb12u2",
"3.17.1-3",
"3.19-1",
"3.19-2",
"3.19-3",
"3.19-4",
"3.19-5",
"3.19-6",
"3.19-7",
"4.0-1",
"4.0-1~exp1",
"4.0-2",
"4.0-3",
"4.0-4",
"4.1-1",
"4.1-1~exp1",
"4.1.1-1",
"4.1.1-2",
"4.1.1-2~exp1",
"4.1.1-3",
"4.2-1",
"4.2-2",
"4.2-3",
"4.2-4",
"4.2-5",
"4.2-6",
"4.2.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18107.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "criu",
"purl": "pkg:deb/debian/criu?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.1.1-1",
"4.1.1-2",
"4.1.1-2~exp1",
"4.1.1-3",
"4.2-1",
"4.2-2",
"4.2-3",
"4.2-4",
"4.2-5",
"4.2-6",
"4.2.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18107.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.2-5"
}
]
}
],
"package": {
"name": "criu",
"purl": "pkg:deb/debian/criu?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.1.1-1",
"4.1.1-2",
"4.1.1-2~exp1",
"4.1.1-3",
"4.2-1",
"4.2-2",
"4.2-3",
"4.2-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18107.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55560 · Revision 1
- Added to Heist Feed
- Publisher date