Is there a patch available for CVE-2026-98888?

Yes, a patch is available for CVE-2026-98888. Update the affected software to the latest version immediately.

Linux CVE-2026-98888

EUVD-2026-108682

2026-10-23 Linux

GHSA-g4px-h95h-7mgm

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: kprobes: Allow reentering kprobes while single-stepping

A kprobe can be hit while another kprobe is in KPROBE_HIT_SS state. This can happen when tracing or perf code runs from the debug exception path while the first kprobe is preparing or executing its out-of-line single-step instruction.

Currently arm64 treats a kprobe hit in KPROBE_HIT_SS as unrecoverable, the same as a hit in KPROBE_REENTER. This is too strict. A hit in KPROBE_HIT_SS is still a one-level reentry and can be handled by saving the current kprobe state and setting up single-step for the new probe, just like reentry from KPROBE_HIT_ACTIVE or KPROBE_HIT_SSDONE.

The truly unrecoverable case is hitting another kprobe while already in KPROBE_REENTER, because the reentry save area has already been consumed.

Move KPROBE_HIT_SS to the recoverable reentry cases and leave KPROBE_REENTER as the unrecoverable nested reentry case.

This change also requires saving saved_irqflag in struct prev_kprobe. When a nested kprobe calls kprobes_save_local_irqflag(), it overwrites kcb->saved_irqflag with the currently masked DAIF value, losing the outer kprobe's original DAIF state. Without this fix, when the outer kprobe's single-step finishes, kprobes_restore_local_irqflag() applies the wrong DAIF mask and leaves interrupts permanently disabled.

Extend struct prev_kprobe with a saved_irqflag field and save/restore it alongside kp and status. This ensures the outer kprobe's original interrupt state is preserved across reentry.

This mirrors the x86 fix in commit 6a5022a56ac3 ("kprobes/x86: Allow to handle reentered kprobe on single-stepping").

Affected VersionsENISA

Linux 0 <6.1.189

Linux 0 <6.6.158

Linux patch: 6.6.158

Linux patch: 7.2

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8e84e292ed4cfc199824146da71bb4397b02a1f

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bb0fe9121aa0824211aafa33c7d0151fd25ddb75

Linux 0 <6.18.53

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <23f851ac0078a908bf3422d6467ebc1db5828c46

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <68774caca799e9695db56d426c69acebd041c2ed

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f96a0606de6bcc8d937b80e6470fd7a174c17e26

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a21bf9cb893126e8d9730995708d0be5eb167652

Linux patch: 5.15.222

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1f342b3e44c3035a837b53b217d816f7511c0d0a

Linux patch: 6.12.111

Linux 0 <6.12.111

Linux 0 <5.10.271

Linux 0 <5.15.222

Linux patch: 6.18.53

Linux patch: 6.1.189

Linux patch: 5.10.271

Affected Packages

euvd linux fix: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53

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 23, 2026 - 12:16 EUVD

CVE Published

Oct 23, 2026 - 11:37 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 89% 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.