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NVD / CVE Program· CNA Linux

CVE-2023-52597: KVM: s390: fix setting of fpc register

Noroxi assessment

Priority: Monitor (action score 16/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 0671f42a9c1084db10d68ac347d08dbf6689ecb3, 150a3a3871490e8c454ffbac2e60abeafcecff99, 2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0671f42a9c1084db10d68ac347d08dbf6689ecb3, 150a3a3871490e8c454ffbac2e60abeafcecff99, 2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: fix setting of fpc register kvm_arch_vcpu_ioctl_set_fpu() allows to set the floating point control (fpc) register of a guest cpu. The new value is tested for validity by temporarily loading it into the fpc register. This may lead to corruption of the fpc register of the host process: if an interrupt happens while the value is temporarily loaded into the fpc register, and within interrupt context floating point or vector registers are used, the current fp/vx registers are saved with save_fpu_regs() assuming they belong to user space and will be loaded into fp/vx registers when returning to user space. test_fp_ctl() restores the original user space / host process fpc register value, however it will be discarded, when returning to user space. In result the host process will incorrectly continue to run with the value that was supposed to be used for a guest cpu. Fix this by simply removing the test. There is another test right before the SIE context is entered which will handles invalid values. This results in a change of behaviour: invalid values will now be accepted instead of that the ioctl fails with -EINVAL. This seems to be acceptable, given that this interface is most likely not used anymore, and this is in addition the same behaviour implemented with the memory mapped interface (replace invalid values with zero) - see sync_regs() in kvm-s390.c.

MediumCVSS 4.0 · v3.1—No exploit Fix available
Published
Mar 6, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 14th percentile
CWE
—

Report tools

JSON

Action score

16

Monitor

Low priority for now.

CVSS
16 / 40 · 4.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-52597

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • linux linux kernel4.20 and later · before 5.4.269
  • linux linux kernel5.5 and later · before 5.10.210
  • linux linux kernel5.11 and later · before 5.15.149
  • linux linux kernelbefore 4.19.307
  • linux linux kernel6.2 and later · before 6.6.16
  • linux linux kernel6.7 and later · before 6.7.4
  • linux linux kernel5.16 and later · before 6.1.77

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.13affected
    • 6.7.4 and later · up to and including 6.7.*not affected · semver
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 3a04410b0bc7e056e0843ac598825dd359246d18affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 150a3a3871490e8c454ffbac2e60abeafcecff99affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 732a3bea7aba5b15026ea42d14953c3425cc7dc2affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 0671f42a9c1084db10d68ac347d08dbf6689ecb3affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before c87d7d910775a025e230fd6359b60627e392460faffected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before 2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7affected · git
    • 4725c86055f5bbdcdfe47199c0715881893a2c79 and later · before b988b1bb0053c0dcd26187d29ef07566a565cf55affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-52595Mar 6, 2024 · wifi: rt2x00: restart beacon queue when hardware reset
    22Monitor
  • ← EarlierCVE-2023-52596Mar 6, 2024 · sysctl: Fix out of bounds access for empty sysctl registers
    22Monitor
  • Later →CVE-2023-52598Mar 6, 2024 · s390/ptrace: handle setting of fpc register correctly
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0671f42a9c1084db10d68ac347d08dbf6689ecb3Vendor (CNA)
Linux Linux150a3a3871490e8c454ffbac2e60abeafcecff99Vendor (CNA)
Linux Linux2823db0010c400e4b2b12d02aa5d0d3ecb15d7c7Vendor (CNA)
Linux Linux3a04410b0bc7e056e0843ac598825dd359246d18Vendor (CNA)
Linux Linux5e63c9ae8055109d805aacdaf2a4fe2c3b371ba1Vendor (CNA)
Linux Linux732a3bea7aba5b15026ea42d14953c3425cc7dc2Vendor (CNA)
Linux Linuxb988b1bb0053c0dcd26187d29ef07566a565cf55Vendor (CNA)
Linux Linuxc87d7d910775a025e230fd6359b60627e392460fVendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records