CVE-2023-52760Public exploit

Kernel memory corruption via premature GFS2 teardown

Published May 21, 2024 · Updated Aug 5, 2026

Use-after-free in Linux 6.6 allows local users to corrupt kernel memory by unmounting a GFS2 filesystem after quota access. In gfs2_put_super(), the read-only teardown path frees struct gfs2_sbd without running gfs2_quota_cleanup(), so the later gfs2_qd_dealloc RCU callback writes through the freed pointer. Reachability requires local ability to mount and unmount a GFS2 filesystem and issue a quota query; triggering it can crash the host or corrupt kernel memory.

CVSS severity7.8
High
EPSS probability0.27%
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 Linux 6.6 allows local users to corrupt kernel memory by unmounting a GFS2 filesystem after quota access. In gfs2_put_super(), the read-only teardown path frees struct gfs2_sbd without running gfs2_quota_cleanup(), so the later gfs2_qd_dealloc RCU callback writes through the freed pointer. Reachability requires local ability to mount and unmount a GFS2 filesystem and issue a quota query; triggering it can crash the host or corrupt kernel memory.

The record

CVE
CVE-2023-52760
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=6.6
  2. Affected versionversion=f66af88e33212b57ea86da2c5d66c0d9d5c46344 <08a28272faa750d4357ea2cb48d2baefd778ea81
  3. Affected versionversion=f66af88e33212b57ea86da2c5d66c0d9d5c46344 <bdcb8aa434c6d36b5c215d02a9ef07551be25a37

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=f66af88e33212b57ea86da2c5d66c0d9d5c46344 <08a28272faa750d4357ea2cb48d2baefd778ea81; version=f66af88e33212b57ea86da2c5d66c0d9d5c46344 <bdcb8aa434c6d36b5c215d02a9ef07551be25a37

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS: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 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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

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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