{"id":"CVE-2026-104795","aliases":[],"cve":{"records":[{"id":"CVE-2026-104795","source":"redhat","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-02T13:07:13.820Z","published":"2026-10-14T10:55:17.144Z","modified":"2026-10-30T04:26:30.832Z"}],"publishers":[{"name":"redhat","role":"CNA","organizationId":"53f830b8-0a3f-465b-8143-3b8a9948e749","modified":"2026-10-30T04:26:30.832Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-14T15:26:53.109Z"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:83702","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://access.redhat.com/errata/RHSA-2026:89198","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://access.redhat.com/errata/RHSA-2026:89341","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://access.redhat.com/errata/RHSA-2026:89655","tags":["vendor-advisory","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://access.redhat.com/security/cve/CVE-2026-104795","tags":["vdb-entry","x_refsource_REDHAT"],"source":"redhat"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543917","tags":["issue-tracking","x_refsource_REDHAT"],"source":"redhat"}],"weaknesses":[{"id":"CWE-250","description":"Execution with Unnecessary Privileges","source":"redhat"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-14T15:25:50.103511Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Insights-runtime-extractor: insights-runtime-extractor: container escape via privileged binary execution","titleSource":"redhat","descriptionSource":"redhat","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","score":8.8,"severity":"high","published":"2026-10-14T10:55:17.144Z","modified":"2026-10-30T04:26:30.832Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4.19","platforms":[],"versions":[{"version":"1792771524","status":"unaffected","lessThan":"*","versionType":"rpm"}],"defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4.19::el9"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4.20","platforms":[],"versions":[{"version":"1792849665","status":"unaffected","lessThan":"*","versionType":"rpm"}],"defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4.20::el9"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4.21","platforms":[],"versions":[{"version":"1792008935","status":"unaffected","lessThan":"*","versionType":"rpm"}],"defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4.21::el9"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 4.22","platforms":[],"versions":[{"version":"1792844435","status":"unaffected","lessThan":"*","versionType":"rpm"}],"defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4.22::el9"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"},{"vendor":"Red Hat","name":"Red Hat OpenShift Container Platform 5","platforms":[],"versions":[],"defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:5"],"source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"}],"remediation":[{"text":"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.","source":"redhat","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"}],"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"],"sources":[{"name":"CVE","id":"CVE-2026-104795","modified":"2026-10-30T04:26:30.832Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-104795"}],"assessments":[{"source":"redhat","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-30T04:31:33.886Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:00:33.317Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-30T04:35:31.081Z","attemptedAt":"2026-10-30T04:35:31.081Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-30T04:35:31.080Z","attemptedAt":"2026-10-30T04:35:31.080Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-30T04:35:30.786Z","attemptedAt":"2026-10-30T04:35:30.786Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-30T04:35:30.903Z","attemptedAt":"2026-10-30T04:35:30.903Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-100981","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100981","modified":"Oct 29, 2026, 5:04:14 PM","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T04:35:30.786Z"},{"source":"FIRST EPSS","id":"CVE-2026-104795","url":"https://www.first.org/epss/","probability":0.00159,"percentile":0.0503,"date":"2026-10-29","checkedAt":"2026-10-30T04:35:30.903Z"},{"source":"GitHub Advisory Database","id":"GHSA-98f3-7g2j-289q","url":"https://github.com/advisories/GHSA-98f3-7g2j-289q","modified":"2026-10-29T18:30:37Z","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T04:35:31.080Z"},{"source":"NVD","id":"CVE-2026-104795","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104795","modified":"2026-10-29T17:17:55.960","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","checkedAt":"2026-10-30T04:35:31.081Z"}],"aiSummary":null}