What is the CVSS score of EUVD-2026-16158?

EUVD-2026-16158 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-16158?

Yes, a patch is available for EUVD-2026-16158. Update the affected software to the latest version immediately.

Linux EUVD-2026-16158

| CVE-2026-23398 MEDIUM

NULL Pointer Dereference (CWE-476)

2026-03-26 Linux

Denial Of Service Linux Null Pointer Dereference Canonical

5.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness

CWE

CWE-476

OWASP Top 10:2025

A10:2025 - Mishandling of Exceptional Conditions

ASVS 5.0

V16 - Security Logging and Error Handling Null pointer safety, defensive checks

MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 26, 2026

Linux kernel ICMP tag validation routines fail to check for NULL protocol handler pointers before dereferencing them, causing kernel panics in softirq context when processing fragmentation-needed errors with unregistered protocol numbers and ip_no_pmtu_disc hardened mode enabled. The vulnerability affects multiple Linux kernel versions across stable branches (6.1, 6.6, 6.12, 6.18, 6.19, and 7.0-rc5), with an EPSS score of 0.02% (7th percentile) indicating low real-world exploitation probability. No public exploit code or active exploitation has been confirmed; the fix requires adding a NULL pointer check in icmp_tag_validation() before accessing icmp_strict_tag_validation.

Affected VersionsENISA

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <614aefe56af8e13331e50220c936fc0689cf5675

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <b61529c357f1ee4d64836eb142a542d2e7ad67ce

Linux patch: 6.12.78

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <9647e99d2a617c355d2b378be0ff6d0e848fd579

Linux patch: 6.6.130

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <1e4e2f5e48cec0cccaea9815fb9486c084ba41e2

Linux 3.14

Linux patch: 6.19.10

Linux patch: 0

Linux patch: 6.1.167

Linux patch: 6.18.20

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <d938dd5a0ad780c891ea3bc94cae7405f11e618a

Linux patch: 7.0-rc5

Linux 8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e <1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.5 MEDIUM

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SUSE 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Red Hat 6.2 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVSS changed

Apr 24, 2026 - 15:22 NVD

5.5 (MEDIUM)

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 26, 2026 - 10:22 nvd

N/A

DescriptionNVD

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

icmp: fix NULL pointer dereference in icmp_tag_validation()

icmp_tag_validation() unconditionally dereferences the result of rcu_dereference(inet_protos[proto]) without checking for NULL. The inet_protos[] array is sparse -- only about 15 of 256 protocol numbers have registered handlers. When ip_no_pmtu_disc is set to 3 (hardened PMTU mode) and the kernel receives an ICMP Fragmentation Needed error with a quoted inner IP header containing an unregistered protocol number, the NULL dereference causes a kernel panic in softirq context.

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:icmp_unreach (net/ipv4/icmp.c:1085 net/ipv4/icmp.c:1143) Call Trace: <IRQ> icmp_rcv (net/ipv4/icmp.c:1527) ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207) ip_local_deliver_finish (net/ipv4/ip_input.c:242) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) __netif_receive_skb_one_core (net/core/dev.c:6164) process_backlog (net/core/dev.c:6628) handle_softirqs (kernel/softirq.c:561) </IRQ>

Add a NULL check before accessing icmp_strict_tag_validation. If the protocol has no registered handler, return false since it cannot perform strict tag validation.

Threat Intelligence Overview

EPSS Score

0.0%

Top 93% exploitable

Threat Intel

1 source

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS CISA Vendor

VulDB

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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat Yes

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

PoC: 0

Weaponized: 0

Threat intel: +10

Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-476 – NULL Pointer Dereference

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Vendor StatusVendor

Debian

linux

Release	Status	Fixed Version	Urgency
bullseye	vulnerable	5.10.223-1	-
bullseye (security)	vulnerable	5.10.251-1	-
bookworm	vulnerable	6.1.159-1	-
bookworm (security)	vulnerable	6.1.164-1	-
trixie	vulnerable	6.12.73-1	-
trixie (security)	vulnerable	6.12.74-2	-
forky, sid	vulnerable	6.19.8-1	-
(unstable)	fixed	(unfixed)	-

SUSE

Severity: High

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7	Fixed

Threat IntelligenceMISP

CISA Advisories

ICSA-26-209-04 ICSA-26-295-11 ICSA-26-295-16

Sources: CISA (public domain)

References

Advisories & patches

Search Externally

GitHub PoC

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