CVE-2026-53370

Local service interruption via unchecked ACR masks

Published Jul 19, 2026 · Updated Jul 19, 2026

Improper ACR mask validation in affected Linux Kernel releases from 6.16 allows local users to interrupt service through perf event settings. The Intel perf path accepts attr.config2 bits from another ACR group, returns early on invalid bits, and reuses uncleared hw.config1 masks. Exploitation requires local low-privilege access on Intel x86 hardware with ACR sampling active; sources establish availability loss but do not identify a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper ACR mask validation in affected Linux Kernel releases from 6.16 allows local users to interrupt service through perf event settings. The Intel perf path accepts attr.config2 bits from another ACR group, returns early on invalid bits, and reuses uncleared hw.config1 masks. Exploitation requires local low-privilege access on Intel x86 hardware with ACR sampling active; sources establish availability loss but do not identify a hang, crash, or reboot.

The record

CVE
CVE-2026-53370
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.16
  2. Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <5ad732a56be46aabf158c16aa0c095291727aaef
  3. Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <aab56b95bee3ff79176b13443cd9d7cfe9747df0
  4. Affected versionversion=ec980e4facef8110f6fce27e5b6344660117f01f <c05e01cef47d9b4969eae2dcf9467e2a555bcb4f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=ec980e4facef8110f6fce27e5b6344660117f01f <5ad732a56be46aabf158c16aa0c095291727aaef; version=ec980e4facef8110f6fce27e5b6344660117f01f <aab56b95bee3ff79176b13443cd9d7cfe9747df0; version=ec980e4facef8110f6fce27e5b6344660117f01f <c05e01cef47d9b4969eae2dcf9467e2a555bcb4f

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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