CVE-2025-37747

Local task hang via uncancelled perf task work

Published May 1, 2025 · Updated May 23, 2026

Denial of service in the perf subsystem of affected Linux kernel releases allows local users to hang a task by closing a sigtrap event. The perf event release path calls perf_pending_task_sync after task_work_run detaches pending callbacks, so task_work_cancel fails and rcuwait_wait_event waits indefinitely. Low-privilege local access is required; mutually targeted events deadlock tasks that close their event descriptors after the required event relationship is created.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the perf subsystem of affected Linux kernel releases allows local users to hang a task by closing a sigtrap event. The perf event release path calls perf_pending_task_sync after task_work_run detaches pending callbacks, so task_work_cancel fails and rcuwait_wait_event waits indefinitely. Low-privilege local access is required; mutually targeted events deadlock tasks that close their event descriptors after the required event relationship is created.

The record

CVE
CVE-2025-37747
Published
May 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=104e258a004037bc7dba9f6085c71dad6af57ad4
  2. Affected versionversion=3a5465418f5fd970e86a86c7f4075be262682840 <1267bd38f161c1a27d9b722de017027167a225a0
  3. Affected versionversion=3a5465418f5fd970e86a86c7f4075be262682840 <56799bc035658738f362acec3e7647bb84e68933
  4. Affected versionversion=3a5465418f5fd970e86a86c7f4075be262682840 <665b87b8f8b3aeb49083ef3b65c4953e7753fc12
  5. Affected versionversion=3a5465418f5fd970e86a86c7f4075be262682840 <fa1827fa968c0674e9b6fca223fa9fb4da4493eb
  6. Affected versionversion=5.15.165 <5.16
  7. Affected versionversion=6.10.3 <6.11
  8. Affected versionversion=6.11
  9. Affected versionversion=6.1.103 <6.2
  10. Affected versionversion=6.6.44 <6.7
  11. Affected versionversion=9ad46f1fef421d43cdab3a7d1744b2f43b54dae0
  12. Affected versionversion=ed2c202dac55423a52d7e2290f2888bf08b8ee99
  13. Affected versionversion=f34d8307a73a18de5320fcc6f40403146d061891

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=104e258a004037bc7dba9f6085c71dad6af57ad4; version=3a5465418f5fd970e86a86c7f4075be262682840 <1267bd38f161c1a27d9b722de017027167a225a0; version=3a5465418f5fd970e86a86c7f4075be262682840 <56799bc035658738f362acec3e7647bb84e68933; version=3a5465418f5fd970e86a86c7f4075be262682840 <665b87b8f8b3aeb49083ef3b65c4953e7753fc12; version=3a5465418f5fd970e86a86c7f4075be262682840 <fa1827fa968c0674e9b6fca223fa9fb4da4493eb; version=5.15.165 <5.16; version=6.10.3 <6.11; version=6.11; version=6.1.103 <6.2; version=6.6.44 <6.7; version=9ad46f1fef421d43cdab3a7d1744b2f43b54dae0; version=ed2c202dac55423a52d7e2290f2888bf08b8ee99; version=f34d8307a73a18de5320fcc6f40403146d061891

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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