CVE-2026-52947

Kernel memory corruption via QRTR RCU race

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the QRTR port removal path in Linux Kernel allows local users to corrupt kernel memory through a race. The qrtr_port_remove function calls __sock_put before erasing the socket from qrtr_ports and waiting for the RCU grace period, so concurrent readers can call sock_hold after the reference count reaches zero. The race requires local low-privileged access and concurrent port removal and lookup; exploitation compromises kernel confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the QRTR port removal path in Linux Kernel allows local users to corrupt kernel memory through a race. The qrtr_port_remove function calls __sock_put before erasing the socket from qrtr_ports and waiting for the RCU grace period, so concurrent readers can call sock_hold after the reference count reaches zero. The race requires local low-privileged access and concurrent port removal and lookup; exploitation compromises kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-52947
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=4.7
  2. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <03bfa95e452e2b6ccd76a332060ae4feaf5ad84d
  3. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <2047c2aa0963bb2872fd722300a15bcb441a4c00
  4. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <2aa4c12723fe432e623462a3be42a197a128722b
  5. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <3b20ec8f31e8a6a6782243f473b0abd3463621df
  6. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <474293d90880622fde9d2430fb0165767090f7b3
  7. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <7de2d447072be3b1a76793f034432338fc9c494b
  8. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <a2171131ecda1ed61a594a1eb715e75fdad0fef5
  9. Affected versionversion=bdabad3e363d825ddf9679dd431cca0b2c30f881 <ab269990ed58143a92a263be1bee626d82ac03da

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.7; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <03bfa95e452e2b6ccd76a332060ae4feaf5ad84d; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <2047c2aa0963bb2872fd722300a15bcb441a4c00; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <2aa4c12723fe432e623462a3be42a197a128722b; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <3b20ec8f31e8a6a6782243f473b0abd3463621df; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <474293d90880622fde9d2430fb0165767090f7b3; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <7de2d447072be3b1a76793f034432338fc9c494b; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <a2171131ecda1ed61a594a1eb715e75fdad0fef5; version=bdabad3e363d825ddf9679dd431cca0b2c30f881 <ab269990ed58143a92a263be1bee626d82ac03da

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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