CVE-2023-52707

Local privilege escalation via PSI waitqueue use-after-free

Published May 21, 2024 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel releases allows local users to escalate privileges through delegated cgroup PSI files. cgroup_file_release() frees the psi_trigger waitqueue when a non-root cgroup is removed even though epoll retains a reference, so ep_remove_wait_queue() later writes through freed memory. Reachability requires writable delegated cgroup v2 controls; successful exploitation grants kernel privileges, while an unsuccessful attempt can panic the host.

CVSS severity7.8
High
EPSS probability0.26%
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 affected Linux kernel releases allows local users to escalate privileges through delegated cgroup PSI files. cgroup_file_release() frees the psi_trigger waitqueue when a non-root cgroup is removed even though epoll retains a reference, so ep_remove_wait_queue() later writes through freed memory. Reachability requires writable delegated cgroup v2 controls; successful exploitation grants kernel privileges, while an unsuccessful attempt can panic the host.

The record

CVE
CVE-2023-52707
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <7caeb5457bd01ccba0df1d6f4872f20d28e50b38
  2. Affected versionversion=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe
  3. Affected versionversion=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <c6879a4dcefe92d870ab68cabaa9caeda4f2af5a
  4. Affected versionversion=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a
  5. Affected versionversion=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <ec9c7aa08819f976b2492fa63c41b5712d2924b5
  6. Affected versionversion=5.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <7caeb5457bd01ccba0df1d6f4872f20d28e50b38; version=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <c2dbe32d5db5c4ead121cf86dabd5ab691fb47fe; version=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <c6879a4dcefe92d870ab68cabaa9caeda4f2af5a; version=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <cca2b3feb70170ef6f0fbc4b4d91eea235a2b73a; version=0e94682b73bfa6c44c98af7a26771c9c08c055d5 <ec9c7aa08819f976b2492fa63c41b5712d2924b5; version=5.2

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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 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

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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