CVE-2023-52598

Tracer state corruption via interrupt-driven FPC race

Published Mar 6, 2024 · Updated May 11, 2026

Race condition in Linux kernel 4.3 through 6.7.3 allows local users on s390 systems to corrupt a tracer's floating-point control state. In arch/s390/kernel/ptrace.c, test_fp_ctl() loads the traced process's FPC value before preserving the tracer's FP/VX registers, so an interrupt can save the wrong state. Exploitation requires ptrace access and an interrupt that uses floating-point or vector registers; the tracer then resumes with attacker-supplied FPC state, exposing data or interrupting service.

CVSS severity7.1
High
EPSS probability0.24%
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 4.3 through 6.7.3 allows local users on s390 systems to corrupt a tracer's floating-point control state. In arch/s390/kernel/ptrace.c, test_fp_ctl() loads the traced process's FPC value before preserving the tracer's FP/VX registers, so an interrupt can save the wrong state. Exploitation requires ptrace access and an interrupt that uses floating-point or vector registers; the tracer then resumes with attacker-supplied FPC state, exposing data or interrupting service.

The record

CVE
CVE-2023-52598
Published
Mar 6, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.3
  2. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <02c6bbfb08bad78dd014e24c7b893723c15ec7a1
  3. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <28a1f492cb527f64593457a0a0f0d809b3f36c25
  4. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <6ccf904aac0292e1f6b1a1be6c407c414f7cf713
  5. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <6d0822f2cc9b153bf2df49a84599195a2e0d21a8
  6. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <7a4d6481fbdd661f9e40e95febb95e3dee82bad3
  7. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <856caf2730ea18cb39e95833719c02a02447dc0a
  8. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <8b13601d19c541158a6e18b278c00ba69ae37829
  9. Affected versionversion=9977e886cbbc758b4b601a160b5825ba573b5ca8 <bdce67df7f12fb0409fbc604ce7c4254703f56d4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <02c6bbfb08bad78dd014e24c7b893723c15ec7a1; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <28a1f492cb527f64593457a0a0f0d809b3f36c25; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <6ccf904aac0292e1f6b1a1be6c407c414f7cf713; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <6d0822f2cc9b153bf2df49a84599195a2e0d21a8; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <7a4d6481fbdd661f9e40e95febb95e3dee82bad3; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <856caf2730ea18cb39e95833719c02a02447dc0a; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <8b13601d19c541158a6e18b278c00ba69ae37829; version=9977e886cbbc758b4b601a160b5825ba573b5ca8 <bdce67df7f12fb0409fbc604ce7c4254703f56d4

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
6.0OracleCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-125Out-of-bounds Read

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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