Is there a patch available for CVE-2026-98655?

Yes, a patch is available for CVE-2026-98655. Update the affected software to the latest version immediately.

Linux CVE-2026-98655

EUVD-2026-103909

2026-10-18 Linux

GHSA-73f2-5qh8-h6cg

Information Disclosure Linux

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Monitor Track and reassess. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisCVE.org

In the Linux kernel, the following vulnerability has been resolved:

perf: Require kernel access for text poke events

Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address.

An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR.

Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.

Affected VersionsENISA

Linux patch: 7.3-rc6

Linux e17d43b93e544f5016c0251d2074c15568d5d963 <677d0b51ac1a0db55d768c4c6399210b3de0795b

Linux e17d43b93e544f5016c0251d2074c15568d5d963 <8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7

Linux e17d43b93e544f5016c0251d2074c15568d5d963 <e506333d1b9f42f1e402acebf1283af3c44a3809

Linux patch: 0

Linux patch: 6.12.113

Linux patch: 6.18.56

Linux 5.9

Linux patch: 7.2.10

Linux e17d43b93e544f5016c0251d2074c15568d5d963 <357e8a77a501d96c9517f01f4a211eed5e9c9184

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Lifecycle Timeline

Patch available

Oct 18, 2026 - 17:19 EUVD

CVE Published

Oct 18, 2026 - 15:44 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 93% exploitable

Data Quality

3 sources

Confidence: Low

EUVD

CVE.org

EPSS MSRC

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.