CVE-2026-31418

Local service interruption via retained empty buckets

Published Apr 13, 2026 · Updated Apr 13, 2026

Resource-management error in affected Linux Kernel releases allows local users to interrupt service by retaining empty ipset buckets. The netfilter mtype_del function drops a bucket only when both n->pos and its empty-slot count are zero, so a bucket with no live entries remains allocated when n->pos still spans deleted slots. Low-privileged local access is required, and repeated retention can exhaust kernel memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-management error in affected Linux Kernel releases allows local users to interrupt service by retaining empty ipset buckets. The netfilter mtype_del function drops a bucket only when both n->pos and its empty-slot count are zero, so a bucket with no live entries remains allocated when n->pos still spans deleted slots. Low-privileged local access is required, and repeated retention can exhaust kernel memory and interrupt service.

The record

CVE
CVE-2026-31418
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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=5.6
  2. Affected versionversion=6c717726f341fd8f39a3ec2dcf5d98d9d28a2769
  3. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4
  4. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <6cea34d7ec6829b62f521a37a287f670144a2233
  5. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <9862ef9ab0a116c6dca98842aab7de13a252ae02
  6. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb
  7. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <b7eef00f08b92b0b9efe8ae0df6d0005e6199323
  8. Affected versionversion=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ceacaa76f221a6577aba945bb8873c2e640aeba4
  9. Affected versionversion=d2997d64dfa65082236bca1efd596b6c935daf5e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.6; version=6c717726f341fd8f39a3ec2dcf5d98d9d28a2769; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <6cea34d7ec6829b62f521a37a287f670144a2233; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <9862ef9ab0a116c6dca98842aab7de13a252ae02; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <b7eef00f08b92b0b9efe8ae0df6d0005e6199323; version=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ceacaa76f221a6577aba945bb8873c2e640aeba4; version=d2997d64dfa65082236bca1efd596b6c935daf5e

Published CVSS scores

7.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
0.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N

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

T1499Endpoint Denial of Service

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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