Is there a patch available for EUVD-2026-103591?

Yes, a patch is available for EUVD-2026-103591. Update the affected software to the latest version immediately.

Linux EUVD-2026-103591

| CVE-2026-98546

2026-10-18 Linux

GHSA-gfjh-3rr5-qgfr

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:

arm64/boot: Disable trapping of PMZR_EL0 writes to EL2

__init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message.

Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits.

Affected VersionsENISA

Linux 858c7bfcb35e1100b58bb63c9f562d86e09418d9 <071f51188a5d8ec10535541255587976d12fc7d8

Linux 6.14.4 <6.15

Linux patch: 6.12.112

Linux patch: 7.3-rc5

Linux 6.15

Linux 882f78400322c0aec4b641a7168adad9a66bc0c2

Linux patch: 7.2.9

Linux 858c7bfcb35e1100b58bb63c9f562d86e09418d9 <2bc6b218717b9d08f466f88209251d54bc09b207

Linux 858c7bfcb35e1100b58bb63c9f562d86e09418d9 <ce71865bf43f88bed9d9218e9218e537150be506

Linux patch: 0

Linux 6.12.25 <6.12.112

Linux 686d8f7b592f3466f44aea653c8147611b351c83 <bb8c90c86441c090e9036f019cf1b4d7894a2c40

Linux patch: 6.18.55

Affected Packages

euvd linux fix: 6.12.112, 6.15

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 - 16:02 EUVD

CVE Published

Oct 18, 2026 - 15:18 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 91% 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.