CVE-2026-52979

Local availability loss via PSP unregister race

Published Jun 24, 2026 · Updated Jun 24, 2026

Race condition in Linux Kernel 6.18 through 6.18.32 and 6.19 through 7.0.9 allows local users to interrupt kernel availability. psp_assoc_device_get_locked() drops its live psp_dev reference before acquiring psd->lock and does not recheck registration, allowing psp_dev_unregister() to clear device state during that gap. Exploitation requires low-privileged local access and a concurrent PSP device-unregistration window; no confidentiality or integrity impact is reported.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel 6.18 through 6.18.32 and 6.19 through 7.0.9 allows local users to interrupt kernel availability. psp_assoc_device_get_locked() drops its live psp_dev reference before acquiring psd->lock and does not recheck registration, allowing psp_dev_unregister() to clear device state during that gap. Exploitation requires low-privileged local access and a concurrent PSP device-unregistration window; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2026-52979
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
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=6.18
  2. Affected versionversion=6b46ca260e2290e3453d1355ab5b6d283d73d780 <b89769f936a8fa9e66de72ddc1b71a9745a488e6
  3. Affected versionversion=6b46ca260e2290e3453d1355ab5b6d283d73d780 <d90df5ce6deb2424de3ad89bcc693ac1b67accc9
  4. Affected versionversion=6b46ca260e2290e3453d1355ab5b6d283d73d780 <e201c57073e624dd2ba5beaf9eda31e19b77b332

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.18; version=6b46ca260e2290e3453d1355ab5b6d283d73d780 <b89769f936a8fa9e66de72ddc1b71a9745a488e6; version=6b46ca260e2290e3453d1355ab5b6d283d73d780 <d90df5ce6deb2424de3ad89bcc693ac1b67accc9; version=6b46ca260e2290e3453d1355ab5b6d283d73d780 <e201c57073e624dd2ba5beaf9eda31e19b77b332

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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 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

T1499.004Application or System Exploitation

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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