Low
Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads
Type: advisorySources: OSV
Uncontrolled Resource Consumption vulnerability in ash-project ash lets a slow asynchronous read spin a scheduler thread at full CPU while the framework waits for it. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 (lib/ash/actions/read/async_limiter.ex) waited for concurrent async read tasks by polling each with Task.yield(task, 0) in a tight loop rather than blocking. While every outstanding task is still running (a slow related-data load or calculation), the loop returns immediately and repeats, busy-spinning and holding a BEAM scheduler at full CPU for the whole duration of the slow read; concurrent slow reads tie up further schedulers. The fix waits with Task.yield_many (a non-blocking sweep followed by a blocking wait with timeout: :infinity), so the process sleeps until a task completes instead of spinning. This issue affects ash: from 2.19.0 before 3.32.2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-82743
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 22:11 UTC · Revision 1
Source evidence
Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads
core-osv · Original sourcePublished 1 Sept 2026, 03:37 UTC
Uncontrolled Resource Consumption vulnerability in ash-project ash lets a slow asynchronous read spin a scheduler thread at full CPU while the framework waits for it. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 (lib/ash/actions/read/async_limiter.ex) waited for concurrent async read tasks by polling each with Task.yield(task, 0) in a tight loop rather than blocking. While every outstanding task is still running (a slow related-data load or calculation), the loop returns immediately and repeats, busy-spinning and holding a BEAM scheduler at full CPU for the whole duration of the slow read; concurrent slow reads tie up further schedulers. The fix waits with Task.yield_many (a non-blocking sweep followed by a blocking wait with timeout: :infinity), so the process sleeps until a task completes instead of spinning. This issue affects ash: from 2.19.0 before 3.32.2.
osv:CVE-2026-82743
Complete source record
{
"id": "b2b97c2974e05c65ce75bfe3983a40e3471e16bedd6a56eb2663e9a32677bda1",
"url": "https://osv.dev/vulnerability/CVE-2026-82743",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Ash.Actions.Read.AsyncLimiter busy-spins a scheduler while awaiting slow async reads",
"summary": "Uncontrolled Resource Consumption vulnerability in ash-project ash lets a slow asynchronous read spin a scheduler thread at full CPU while the framework waits for it. Ash.Actions.Read.AsyncLimiter.await_at_least_one/1 (lib/ash/actions/read/async_limiter.ex) waited for concurrent async read tasks by polling each with Task.yield(task, 0) in a tight loop rather than blocking. While every outstanding task is still running (a slow related-data load or calculation), the loop returns immediately and repeats, busy-spinning and holding a BEAM scheduler at full CPU for the whole duration of the slow read; concurrent slow reads tie up further schedulers. The fix waits with Task.yield_many (a non-blocking sweep followed by a blocking wait with timeout: :infinity), so the process sleeps until a task completes instead of spinning. This issue affects ash: from 2.19.0 before 3.32.2.",
"evidence": "osv:CVE-2026-82743",
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"severity": "low",
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"modified": "2026-10-28T02:30:32.248519822Z",
"provider": "osv",
"references": [
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"https://github.com",
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"source_id": "core-osv",
"document_id": 499113,
"published_at": "2026-09-01T03:37:24.292+00:00"
}