CVE intelligence and bounded remediation

CVE-2023-34320 — Arm Cortex-A77 Firmware security vulnerability

Medium CVSS 5.5

Cortex-A77 cores (r0p0 and r1p0) are affected by erratum 1508412 where software, under certain circumstances, could deadlock a core due to the execution of either a load to device or non-cacheable memory, and either a store exclusive or register read of the Physical Address Register (PAR_EL1) in close proximity.

Severity
Medium
CVSS
5.5 (3.1)
Published
2023-12-08
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-667

Affected products

  • arm / cortex-a77_firmware / r0p0
  • arm / cortex-a77_firmware / r1p0
  • xen / xen

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

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Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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