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EUVD-2026-326502

2026-10-07T16:47:27.516498+00:00

EUVD-2026-326502

fkie_cve-2026-50570

2026-10-07T16:47:27.516538+00:00

Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted CAP_SYS_TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: ["SYS_TIME"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP_SYS_TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.

GHSA-qf5v-m7p4-95rp — Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and…

2026-10-07T16:47:27.516576+00:00

Affected: Go: github.com/fission/fission

Fission v1.24.0 added PodSpec safety validation for tenant-facing Environment and Function CRDs (`ValidatePodSpecSafety` / `ValidateContainerSafety` admission webhook + `sanitizeContainerSecurityContext` executor merge layer), but the capability check was implemented as a fixed **denylist of six Linux capabilities** (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted **CAP_SYS_TIME**, among others. As a result, a tenant who could create a Function or Environment CRD could request `securityContext.capabilities.add: ["SYS_TIME"]`, pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with `CAP_SYS_TIME` in the resulting function or runtime container.

Demonstrated consequence: cross-tenant node integrity damage via `CAP_SYS_TIME`. The Linux real-time clock is not namespaced — time namespaces virtualize only `MONOTONIC` and `BOOTTIME`, never `REALTIME` — so a tenant container holding `CAP_SYS_TIME` could call `clock_settime(CLOCK_REALTIME)` and rewrite the shared node wall clock. That corrupts TLS / certificate validity windows, Kubernetes lease renewal, token expiry, scheduling, and time-series for every workload on the node.

The denylist also omitted `SYS_RAWIO`, `BPF`, `SYS_RESOURCE`, and `MAC_ADMIN`. Those are documented as evidence that the denylist is structurally incomplete (their practical impact is kernel-, LSM-, or device-cgroup-dependent and is not exercised in this report).…