CVE-2025-37997

Unspecified impact via incorrect ipset region mapping

Published May 29, 2025 · Updated Aug 5, 2026

Race condition in Linux kernel ipset hash types allows local users to cause unspecified impact through concurrent set updates. The ahash_region macro uses bucket-number modulo lock count instead of dividing by the region size, so operations on one bucket can lock the wrong region. Reachability requires a timeout-enabled hash set and overlap between garbage collection and element insertion; no concrete consequence has been published.

CVSS severity7.8
High
EPSS probability0.17%
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 ipset hash types allows local users to cause unspecified impact through concurrent set updates. The ahash_region macro uses bucket-number modulo lock count instead of dividing by the region size, so operations on one bucket can lock the wrong region. Reachability requires a timeout-enabled hash set and overlap between garbage collection and element insertion; no concrete consequence has been published.

The record

CVE
CVE-2025-37997
Published
May 29, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2025CVE 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=5.4.24 <5.4.294
  2. Affected versionversion=5.5.8 <5.6
  3. Affected versionversion=5.6
  4. Affected versionversion=5dd9488ae41070b69d2f4acb580f77db5705f9ca <00cfc5fad1491796942a948808afb968a0a3f35b
  5. Affected versionversion=a469bab3386aebff33c59506f3a95e35b91118fd
  6. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <226ce0ec38316d9e3739e73a64b6b8304646c658
  7. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <6e002ecc1c8cfdfc866b9104ab7888da54613e59
  8. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <82c1eb32693bc48251d92532975e19160987e5b9
  9. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <8478a729c0462273188263136880480729e9efca
  10. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <a3dfec485401943e315c394c29afe2db8f9481d6
  11. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <aa77294b0f73bb8265987591460cd25b8722c3df
  12. Affected versionversion=f66ee0410b1c3481ee75e5db9b34547b4d582465 <e2ab67672b2288521a6146034a971f9a82ffc5c5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4.24 <5.4.294; version=5.5.8 <5.6; version=5.6; version=5dd9488ae41070b69d2f4acb580f77db5705f9ca <00cfc5fad1491796942a948808afb968a0a3f35b; version=a469bab3386aebff33c59506f3a95e35b91118fd; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <226ce0ec38316d9e3739e73a64b6b8304646c658; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <6e002ecc1c8cfdfc866b9104ab7888da54613e59; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <82c1eb32693bc48251d92532975e19160987e5b9; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <8478a729c0462273188263136880480729e9efca; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <a3dfec485401943e315c394c29afe2db8f9481d6; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <aa77294b0f73bb8265987591460cd25b8722c3df; version=f66ee0410b1c3481ee75e5db9b34547b4d582465 <e2ab67672b2288521a6146034a971f9a82ffc5c5

Published CVSS scores

7.8LinuxCVSS: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 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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