CVE-2026-98507

Task hangs via premature anon_vma publication

Published Oct 18, 2026 · Updated Oct 18, 2026

A race in Linux kernel anonymous-memory management allows local users to hang tasks through concurrent faults on adjacent mappings. __anon_vma_prepare() publishes anon_vma before its root initialization becomes visible, allowing another thread to lock a stale root and unlock a different one. The race requires adjacent, unmerged but compatible mappings and leaves locks stuck; it was reproduced on arm64 with KSM enabled.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in Linux kernel anonymous-memory management allows local users to hang tasks through concurrent faults on adjacent mappings. __anon_vma_prepare() publishes anon_vma before its root initialization becomes visible, allowing another thread to lock a stale root and unlock a different one. The race requires adjacent, unmerged but compatible mappings and leaves locks stuck; it was reproduced on arm64 with KSM enabled.

The record

CVE
CVE-2026-98507
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=2.6.36
  2. Affected versionversion=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <4cef512a955e4008ae4436a4fc97726976df1fdf
  3. Affected versionversion=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <a500df43cde075f6ea4b8bae495d89f2c35b3e16
  4. Affected versionversion=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <b6ac0b3f6013c168f22cad97e79967accacb08e1
  5. Affected versionversion=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <d348a715380bfcc6a611bdf722169d53fd01e735

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.36; version=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <4cef512a955e4008ae4436a4fc97726976df1fdf; version=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <a500df43cde075f6ea4b8bae495d89f2c35b3e16; version=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <b6ac0b3f6013c168f22cad97e79967accacb08e1; version=5c341ee1dfc8fe69d66b1c8b19e463c6d7201ae1 <d348a715380bfcc6a611bdf722169d53fd01e735

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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.

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Technologies

Your stack

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Your stack

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