Arm c1-Ultra Firmware vulnerabilities

2 CVEs affecting Arm c1-Ultra Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2025-0647, published 2026-01-14.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2024-7881, published 2025-01-28. Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days. An unprivileged context can trigger a data memory-dependent prefetch engine to fetch the contents of a privileged location and consume those contents as an address that is also dereferenced.
• CVE-2025-0647, published 2026-01-14. High severity, CVSS 7.9. EPSS: 0.2% chance of exploitation in the next 30 days. In certain Arm CPUs, a CPP RCTX instruction executed on one Processing Element (PE) may inhibit TLB invalidation when a TLBI is issued to the PE, either by the same PE or another PE in the…