Is there a patch available for CVE-2026-98234?

Yes, a patch is available for CVE-2026-98234. Update the affected software to the latest version immediately.

Linux CVE-2026-98234

EUVD-2026-93162

2026-10-06 Linux

GHSA-qgx8-c46g-4vmq

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:

net/sched: hhf: cap hh_flows_limit at change time

hhf_change() stores TCA_HHF_HH_FLOWS_LIMIT with no upper bound. A huge hh_flows_limit lets each new heavy-hitter flow pass the hh_flows_current_cnt check in alloc_new_hh() and forces a fixed-size kzalloc(GFP_ATOMIC) per flow under spoofed traffic, for unbounded memory growth.

Bound the attribute with NLA_POLICY_MAX() at 2*HH_FLOWS_CNT (the hhf_init() default) and report the rejected value via extack. The deprecated nested parse is kept: legacy tc does not set NLA_F_NESTED on TCA_OPTIONS. Configs relying on hh_limit above the default were relying on unbounded, unsafe behaviour and are not supported going forward.

hhf_init() also ran hhf_change() before setting the default hh_flows_limit, so a user-supplied hh_limit at add time was clobbered back to 2048. Set the default before hhf_change() so the configured value sticks.

This is a follow-up to commit eb56a495f59b ("net/sched: hhf: clamp quantum in change and init paths"), which bounded the quantum of the same qdisc; the hh_flows_limit bound is the remaining unbounded knob of that series' scope.

Conditions to recreate the bug: CAP_NET_ADMIN in a user namespace; tc qdisc change dev X root hhf hh_limit 4294967295 succeeds and the value is echoed by tc qdisc show, unbounding heavy-hitter flow allocations; also tc qdisc add dev X root hhf hh_limit 500 stores 2048 instead of 500.

Affected VersionsENISA

Linux patch: 6.18.54

Linux patch: 7.3-rc4

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <d8e2f1f0263b7c97b222c06070cccf13e0ab7112

Linux patch: 6.12.112

Linux patch: 6.6.158

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <2cef2588c995722a901368def30befeef9ae55c6

Linux patch: 5.10.271

Linux patch: 6.1.189

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <7adfd0a42174b85c6bd678858ecd6674f403f336

Linux patch: 0

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <06d2a101e89063cb0b9b459104db48bdfb0a797d

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <f3f4a5cb4a6e9b1f1f25d34dfc25f836a1601db4

Linux patch: 7.2.8

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <35fd423a5c5132c6f4321f6c4f0a7b4b90af830c

Linux 3.14

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <1731ff1d20489afe4cd01b7d16d37f324746ac54

Linux 10239edf86f137ce4c39b62ea9575e8053c549a0 <f6547d27ce2093c5627636fb63dd0b7523c466f9

Linux patch: 5.15.222

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 06, 2026 - 10:02 EUVD

CVE Published

Oct 06, 2026 - 08:45 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.