CVE-2026-98655

Kernel-address disclosure via unchecked text-poke event requests

Published Oct 18, 2026 · Updated Oct 18, 2026

Information disclosure in Linux perf allows local users to bypass KASLR through kernel addresses exposed in text-poke records. In kernel/events/core.c, perf_event_open skips the kernel-access permission check when exclude_kernel=1 even when text_poke=1 requests records containing raw kernel instruction addresses. Exploitation requires permission to open and mmap a task-local perf event; a known kernel image lets the disclosed addresses reveal the runtime kernel text base, without establishing code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux perf allows local users to bypass KASLR through kernel addresses exposed in text-poke records. In kernel/events/core.c, perf_event_open skips the kernel-access permission check when exclude_kernel=1 even when text_poke=1 requests records containing raw kernel instruction addresses. Exploitation requires permission to open and mmap a task-local perf event; a known kernel image lets the disclosed addresses reveal the runtime kernel text base, without establishing code execution.

The record

CVE
CVE-2026-98655
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=5.9
  2. Affected versionversion=e17d43b93e544f5016c0251d2074c15568d5d963 <357e8a77a501d96c9517f01f4a211eed5e9c9184
  3. Affected versionversion=e17d43b93e544f5016c0251d2074c15568d5d963 <677d0b51ac1a0db55d768c4c6399210b3de0795b
  4. Affected versionversion=e17d43b93e544f5016c0251d2074c15568d5d963 <8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7
  5. Affected versionversion=e17d43b93e544f5016c0251d2074c15568d5d963 <e506333d1b9f42f1e402acebf1283af3c44a3809

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=e17d43b93e544f5016c0251d2074c15568d5d963 <357e8a77a501d96c9517f01f4a211eed5e9c9184; version=e17d43b93e544f5016c0251d2074c15568d5d963 <677d0b51ac1a0db55d768c4c6399210b3de0795b; version=e17d43b93e544f5016c0251d2074c15568d5d963 <8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7; version=e17d43b93e544f5016c0251d2074c15568d5d963 <e506333d1b9f42f1e402acebf1283af3c44a3809

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

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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