{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-104795","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-10-02T13:07:13.820Z","datePublished":"2026-10-14T10:55:17.144Z","dateUpdated":"2026-10-30T04:26:30.832Z"},"containers":{"cna":{"title":"Insights-runtime-extractor: insights-runtime-extractor: container escape via privileged binary execution","metrics":[{"other":{"content":{"value":"Important","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4.19","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"openshift4/insights-runtime-extractor-rhel9","defaultStatus":"affected","versions":[{"version":"1792771524","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:openshift:4.19::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4.20","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"openshift4/insights-runtime-extractor-rhel9","defaultStatus":"affected","versions":[{"version":"1792849665","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:openshift:4.20::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4.21","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"openshift4/insights-runtime-extractor-rhel9","defaultStatus":"affected","versions":[{"version":"1792008935","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:openshift:4.21::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4.22","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"openshift4/insights-runtime-extractor-rhel9","defaultStatus":"affected","versions":[{"version":"1792844435","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/a:redhat:openshift:4.22::el9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 5","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift5/insights-runtime-extractor-rhel9","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:5"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:83702","name":"RHSA-2026:83702","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:89198","name":"RHSA-2026:89198","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:89341","name":"RHSA-2026:89341","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:89655","name":"RHSA-2026:89655","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-104795","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543917","name":"RHBZ#2543917","tags":["issue-tracking","x_refsource_REDHAT"]}],"datePublic":"2026-10-14T09:47:53.272Z","problemTypes":[{"descriptions":[{"cweId":"CWE-250","description":"Execution with Unnecessary Privileges","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-250: Execution with Unnecessary Privileges","workarounds":[{"lang":"en","value":"The vulnerability requires a\ncode fix to implement a complete privilege drop (setting all three UID/GID\nfields, clearing all Linux capability sets, and setting `PR_SET_NO_NEW_PRIVS`)\nbefore executing any fingerprint binary."}],"timeline":[{"lang":"en","time":"2026-09-30T12:50:08.063Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-10-14T09:47:53.272Z","value":"Made public."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-10-30T04:26:30.832Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-14T15:25:50.103511Z","id":"CVE-2026-104795","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-14T15:26:53.109Z"}}]}}