CVE-2023-52597

Host-process state corruption via guest FPC validation

Published Mar 6, 2024 · Updated May 11, 2026

Register-state corruption in the Linux KVM s390 backend allows local users to alter a host process's floating-point behavior. kvm_arch_vcpu_ioctl_set_fpu() temporarily loads an untrusted guest FPC value for validation, letting an interrupt save it as host state. Exploitation requires a permitted KVM vCPU FPU ioctl, a precisely timed interrupt, and floating-point or vector use in interrupt context; the host process then resumes with the guest-supplied control value.

CVSS severity4.0
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Register-state corruption in the Linux KVM s390 backend allows local users to alter a host process's floating-point behavior. kvm_arch_vcpu_ioctl_set_fpu() temporarily loads an untrusted guest FPC value for validation, letting an interrupt save it as host state. Exploitation requires a permitted KVM vCPU FPU ioctl, a precisely timed interrupt, and floating-point or vector use in interrupt context; the host process then resumes with the guest-supplied control value.

The record

CVE
CVE-2023-52597
Published
Mar 6, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

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=3.13
  2. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <0671f42a9c1084db10d68ac347d08dbf6689ecb3
  3. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <150a3a3871490e8c454ffbac2e60abeafcecff99
  4. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7
  5. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <3a04410b0bc7e056e0843ac598825dd359246d18
  6. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1
  7. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <732a3bea7aba5b15026ea42d14953c3425cc7dc2
  8. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <b988b1bb0053c0dcd26187d29ef07566a565cf55
  9. Affected versionversion=4725c86055f5bbdcdfe47199c0715881893a2c79 <c87d7d910775a025e230fd6359b60627e392460f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.13; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <0671f42a9c1084db10d68ac347d08dbf6689ecb3; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <150a3a3871490e8c454ffbac2e60abeafcecff99; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <3a04410b0bc7e056e0843ac598825dd359246d18; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <732a3bea7aba5b15026ea42d14953c3425cc7dc2; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <b988b1bb0053c0dcd26187d29ef07566a565cf55; version=4725c86055f5bbdcdfe47199c0715881893a2c79 <c87d7d910775a025e230fd6359b60627e392460f

Published CVSS scores

4.0CISA-ADPCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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