Is there a patch available for CVE-2026-99074?

Yes, a patch is available for CVE-2026-99074. Update the affected software to the latest version immediately.

Linux CVE-2026-99074

EUVD-2026-108740

2026-10-23 Linux

GHSA-j9w6-p85x-r6r9

Information Disclosure Linux

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Awaiting Data No severity or threat signals available yet. Label will update when CVSS score is published or threat intelligence arrives. 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:

ipv4: stop PMTU walk when nexthop group shrinks

Commit 7d3f3b4367f3 ("net: ipv4: Cache pmtu for all packet paths if multipath enabled") made __ip_rt_update_pmtu() update every path.

For nexthop objects, fib_info_num_path() and fib_info_nhc() independently load nh->nh_grp. RCU protects each group's lifetime but does not make the loads observe the same group. If replacement shrinks the group after the loop accepts an index, fib_info_nhc() returns NULL and update_or_create_fnhe() dereferences it.

A deterministic probe only widened the existing window between the real operations. On v7.2, an RTM_NEWNEXTHOP replacement published a one-member group after the PMTU reader accepted index 1 from a two-member group, producing:

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: update_or_create_fnhe+0x45/0x15b0

Stop when the indexed path is absent. Groups are dense, so no later index exists in that snapshot. The same real-writer window completed 114,423 PMTU iterations without an oops with this check. A reproducer is available on request.

Replacement requires CAP_NET_ADMIN in the network namespace. Where unprivileged user namespaces are permitted, a local user can obtain it in a new user and network namespace.

Affected VersionsENISA

Linux 3bed2abab4a682d426624ce9add9d7b6d475d4e4 <7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a

Linux 7f5005457b3072fe1ddf15bfef869f2a1d98e05e <c60d17d6dd61adc761ac6f65a008fefbc54cbf87

Linux patch: 6.12.113

Linux 6.1.129 <6.2

Linux b1f7bdee5750d6cbb9497140cd6582abc5fdcb9e

Linux patch: 6.6.160

Linux 6.6.79 <6.6.160

Linux patch: 7.2.11

Linux 7d3f3b4367f315a61fc615e3138f3d320da8c466 <6619e01855e65ef35723685a557e3eb106f4ecf5

Linux 5.15.179 <5.16

Linux patch: 6.18.57

Linux fc07a232326a623d0be482e307c08ea7049c2846

Linux 7d3f3b4367f315a61fc615e3138f3d320da8c466 <c6d670ac656badfd0e15355e07a13a6bdf3b69fd

Linux 7d3f3b4367f315a61fc615e3138f3d320da8c466 <f27483f9975b5065ff67054cc7eb8edac6083488

Linux 6.13

Linux patch: 0

Linux 6.12.16 <6.12.113

Linux patch: 7.3

Affected Packages

euvd linux fix: 5.16, 6.2, 6.6.160, 6.12.113

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 - 13:17 EUVD

CVE Published

Oct 23, 2026 - 12:23 cve.org

UNKNOWN (no severity yet)

Threat Intelligence Overview

EPSS Score

0.2%

Top 91% exploitable

Data Quality

2 sources

Confidence: Low

EUVD

CVE.org

EPSS

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.