CVE-2026-23416Public exploit

Local denial of service via stale VMA boundary

Published Apr 2, 2026 · Updated Apr 2, 2026

Denial of service in affected Linux Kernel releases allows local users to interrupt service via a crafted mseal call. In mm/mseal.c, mseal_apply() caches curr_end before vma_modify_flags() merges a VMA, then advances curr_start with that stale boundary. An unprivileged process can trigger the condition across adjacent VMAs with mixed seal states; debug builds emit a kernel warning, while production builds silently misapply the seal.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux Kernel releases allows local users to interrupt service via a crafted mseal call. In mm/mseal.c, mseal_apply() caches curr_end before vma_modify_flags() merges a VMA, then advances curr_start with that stale boundary. An unprivileged process can trigger the condition across adjacent VMAs with mixed seal states; debug builds emit a kernel warning, while production builds silently misapply the seal.

The record

CVE
CVE-2026-23416
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.17
  2. Affected versionversion=6c2da14ae1e0a0146587381594559027bd46c059 <2697dd8ae721db4f6a53d4f4cbd438212a80f8dc
  3. Affected versionversion=6c2da14ae1e0a0146587381594559027bd46c059 <40b3f4700e5535fbe74738cebb9379a40ec66bed
  4. Affected versionversion=6c2da14ae1e0a0146587381594559027bd46c059 <83737e34b83a23b2a9bcf586b058b2c2a54c7c6b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=6c2da14ae1e0a0146587381594559027bd46c059 <2697dd8ae721db4f6a53d4f4cbd438212a80f8dc; version=6c2da14ae1e0a0146587381594559027bd46c059 <40b3f4700e5535fbe74738cebb9379a40ec66bed; version=6c2da14ae1e0a0146587381594559027bd46c059 <83737e34b83a23b2a9bcf586b058b2c2a54c7c6b

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service

Public exploit references

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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