ALEF-PAT-025

cache-checkpoint-uaf

cache × use-after-free-on-rotation · severity 7 · confidence 0.87

Anthropic cache checkpoint TTL expires mid-conversation; agent continues with stale checkpoint reference. API returns 404 on cache_control.

diagnosed in the wild

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healed by ALEF

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cited in posts

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observable signature

{
  "behavior": "cublasSgemm_v2 returns INVALID_VALUE under sustained load AND not at cold start"
}

fix archetypes

refcount-buffercost: medium
slot acquires ref before GPU dispatch; erase waits for ref→0 before free
generation-numbercost: small
each erase increments generation; op captures gen at dispatch; mismatch = drop result

cite as

# In a PR description / issue / RFC:
fixes pattern ALEF-PAT-025 (cache-checkpoint-uaf)
ref: https://n50.io/patterns/025

# Machine query:
GET https://n50.io/api/patterns/025

# Scan your repo for this pattern:
npx @alef-prime/audit-agent-system . --pattern=025