Is there a patch available for CVE-2026-98554?

Yes, a patch is available for CVE-2026-98554. Update the affected software to the latest version immediately.

Linux CVE-2026-98554

EUVD-2026-103599

2026-10-18 Linux

GHSA-xh57-3wrj-366f

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:

vlan: ensure sufficient headroom in vlan_dev_hard_header()

Callers that only reserve ETH_HLEN or less (such as llc_alloc_frame()), or skbs allocated before dynamic device/headroom changes (e.g. toggling VLAN_FLAG_REORDER_HDR or bonding/team switching slaves), can reach vlan_dev_hard_header() with insufficient headroom and trigger skb_under_panic().

Use skb_cow_head() in vlan_dev_hard_header() when VLAN_FLAG_REORDER_HDR is not set to ensure sufficient headroom for the VLAN header(s) and the underlying device hard header.

Use READ_ONCE() to read dev->hard_header_len and dev->needed_headroom as they can be updated concurrently under RTNL (e.g. in vlan_transfer_features()) while vlan_dev_hard_header() runs locklessly on the transmit path. Also avoid LL_RESERVED_SPACE(dev) here so that the extra HH_DATA_MOD alignment padding does not trigger unnecessary pskb_expand_head() reallocations on inner stacked VLAN devices after the outer VLAN header has been pushed.

Affected VersionsENISA

Linux patch: 0

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ca797491f0ae4bfde9039f79f6f1ed7781c9110f

Linux patch: 5.15.222

Linux patch: 7.2.9

Linux patch: 6.18.55

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5aca8e6a8ff6aeae358c1d9b65447aac416ace95

Linux 2.6.12

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cfba0f45553de2b803059e3d539a1e418df24da8

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <90d51095371d96747f45bbd8504edf6513e039ef

Linux patch: 6.6.158

Linux patch: 7.3-rc5

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4ba1f57313f36a3ce6f77d593548f0c511f34aa1

Linux patch: 6.12.112

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <55e007fc3b4d76fa4d6b4660f6904fe6ab045a1b

Linux patch: 6.1.189

Linux patch: 5.10.271

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7ee4bea64f559ea8e03260014775b64c720cb5b

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd5dd68267c4238795fadaf02b3575ca3f8a6500

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 - 16:02 EUVD

CVE Published

Oct 18, 2026 - 15:18 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.