{"id":"CVE-2026-104795","revision":"e2b267066e114e9bb518556d590fb0d8","records":[{"revision":"e2b267066e114e9bb518556d590fb0d8","observedAt":"2026-10-30T05:48:55.046+00:00","statement":{"source":"cve-program","id":"CVE-2026-104795","aliases":[],"title":"Insights-runtime-extractor: insights-runtime-extractor: container escape via privileged binary execution","description":"The insights-runtime-extractor runs as a privileged DaemonSet (`hostPID: true`)\nthat scans container processes for runtime fingerprinting. When scanning a\ncontainer, the coordinator:\n\n1. **fork()s** a child process\n2. **setns()** into the target container's PID and mount namespaces\n3. **fchdir()** back to an orphaned FD pointing at the extractor's own root\n   filesystem (where `/crio.sock` is hostPath-mounted)\n4. Calls **only `seteuid(target_uid)`** — changing the effective UID but leaving\n   the **real UID and saved-set-UID at 0** and **retaining the permitted\n   capability set**\n5. The `check_no_privileged_perms()` guard inspects only the Effective capability\n   set (so it passes), and is **skipped entirely when the target runs as uid 0**\n6. The `VersionExecutable` fingerprint invokes `fpr_kind_executable` with\n   `process.command_line[0]` — the target's argv[0], read from\n   `/proc/<pid>/cmdline` and **fully controlled by the workload**\n7. `fpr_kind_executable` calls `exec.Command(executable, \"--version\").Output()`\n   — executing the **workload's own binary** inside the workload's mount\n   namespace while **ruid=0 in the host user namespace**\n\nThe executed process can call `setuid(0)` to restore full root with\n`CAP_SYS_ADMIN`, and inherits the orphaned cwd which resolves into the extractor\ncontainer's filesystem containing the host CRI-O socket.\n\n## Affected Code\n\n### 1. Insufficient privilege drop (Rust — extractor coordinator)\n\n**File:** `extractor/src/insights_runtime_extractor.rs`\n\n```rust\n// Lines 139-146 — seteuid-only drop, guard skipped for root containers\njoin_process_namespaces(process.pid)?;\nchange_dir(current_dir);\nswitch_user(*process.uid)?;\nif *process.uid != 0 {\n    perms::check_no_privileged_perms()\n        .expect(\"Must not have privileged permissions to run fingerprints\");\n}\nfingerprint::run_fingerprints(&config, out_dir, &process);\n```\n\n```rust\n// Lines 182-185 — only effective UID changed; ruid/suid stay 0\nfn switch_user(uid: u32) -> Result<(), ScannerError> {\n    debug!(\"... Becoming user: {uid}\");\n    seteuid(uid.into()).map_err(|e| ScannerError::Errno(e))\n}\n```\n\n### 2. Execution of untrusted binary (Go — fingerprint)\n\n**File:** `fingerprints/pkg/utils/file.go`\n\n```go\n// Lines 75-80 — executes a path taken verbatim from workload's argv[0]\nfunc GetExecutableVersionOutput(executable string) (string, error) {\n    out, err := exec.Command(executable, \"--version\").Output()\n    if err != nil {\n        return \"\", err\n    }\n    return string(out), nil\n}\n```\n\n### 3. Workload-controlled path forwarded (Rust — version_executable)\n\n**File:** `version_executable.rs`\n\n```rust\n// Lines 29-34 — workload-controlled command_line[0] forwarded to fingerprint\nreturn Some(vec![\n    fpr_kind_executable,\n    out_dir.to_string(),\n    String::from(&process.command_line[0]),\n    String::from(&version_executable.runtime_kind_name),\n]);\n```\n\n## Attack Pattern\n\n**Attacker:** Any tenant able to schedule a pod (unprivileged, any namespace)\n**Victim:** The node running the insights-runtime-extractor DaemonSet\n**Trigger:** Automatic — the DaemonSet scans all container processes on the node\n\n**Attack sequence:**\n\n1. Attacker creates a pod whose process name matches a configured\n   versioned-executable pattern (`node`, `python`, `python3`, `MainThread`,\n   or contains `java`)\n2. The pod's main binary (at the path matching argv[0]) is a malicious\n   executable that calls `setuid(0)` to restore root\n3. When the insights operator triggers a scan, the DaemonSet forks, enters the\n   attacker's mount namespace, and executes the attacker's binary with ruid=0\n4. The attacker's code regains full root with `CAP_SYS_ADMIN` in the host user\n   namespace\n5. The inherited cwd contains the host CRI-O socket → full node compromise","state":0,"publishedAt":"2026-10-14T10:55:17.144+00:00","modifiedAt":"2026-10-30T04:26:30.832+00:00","affected":[{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"openshift4/insights-runtime-extractor-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat OpenShift Container Platform 4.19\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"openshift4/insights-runtime-extractor-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1792771524\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:openshift:4.19::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"openshift4/insights-runtime-extractor-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat OpenShift Container Platform 4.20\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"openshift4/insights-runtime-extractor-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1792849665\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:openshift:4.20::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"openshift4/insights-runtime-extractor-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat OpenShift Container Platform 4.21\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"openshift4/insights-runtime-extractor-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1792008935\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:openshift:4.21::el9\"\n                    ]\n                }"},{"ecosystem":"https://catalog.redhat.com/software/containers/","name":"openshift4/insights-runtime-extractor-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat OpenShift Container Platform 4.22\",\n                    \"collectionURL\": \"https://catalog.redhat.com/software/containers/\",\n                    \"packageName\": \"openshift4/insights-runtime-extractor-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1792844435\",\n                            \"lessThan\": \"*\",\n                            \"versionType\": \"rpm\",\n                            \"status\": \"unaffected\"\n                        }\n                    ],\n                    \"cpes\": [\n                        \"cpe:/a:redhat:openshift:4.22::el9\"\n                    ]\n                }"},{"ecosystem":"https://access.redhat.com/downloads/content/package-browser/","name":"openshift5/insights-runtime-extractor-rhel9","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Red Hat\",\n                    \"product\": \"Red Hat OpenShift Container Platform 5\",\n                    \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\",\n                    \"packageName\": \"openshift5/insights-runtime-extractor-rhel9\",\n                    \"defaultStatus\": \"affected\",\n                    \"cpes\": [\n                        \"cpe:/a:redhat:openshift:5\"\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://access.redhat.com/errata/RHSA-2026:83702","https://access.redhat.com/errata/RHSA-2026:89198","https://access.redhat.com/errata/RHSA-2026:89341","https://access.redhat.com/errata/RHSA-2026:89655","https://access.redhat.com/security/cve/CVE-2026-104795","https://bugzilla.redhat.com/show_bug.cgi?id=2543917"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104795","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104795","identifiers":["CVE-2026-104795"]},"retained":false,"historicalAffected":[]}],"coverage":[]}