CVE-2026-98303: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-hw8j-26f4-2863
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Advisory Summary

CVE-2026-98303 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-98303 at a Glance

CVE Identifier CVE-2026-98303
GHSA Identifier GHSA-hw8j-26f4-2863
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-98303

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-98303, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: ipv4: icmp: reject RTN_UNREACHABLE input routes in icmp_route_lookup When the forward output route cannot be used in icmp_route_lookup(), it enters the "reverse path" and calls ip_route_input() on fl4_dec.daddr, the original packet's source address. ip_route_input() only returns an error for truly invalid packets. For unreachable addresses it will succeed and return an input route whose dst.output is set to ip_rt_bug(). The existing check only rejects RTN_LOCAL routes, so the RTN_UNREACHABLE route types can still be returned and later used for output, syzkaller triggering a WARN_ON_ONCE() in ip_rt_bug() as bellow: ------------[ cut here ]------------ WARNING: net/ipv4/route.c:1273 at ip_rt_bug+0x14/0x20 RIP: 0010:ip_rt_bug+0x14/0x20 Call Trace: ip_push_pending_frames+0xfa/0x100 __icmp_send+0x905/0xf10 ip_options_compile+0xc0/0xd0 ip_rcv_finish_core+0x321/0xae0 ip_rcv+0x1de/0x260 __netif_receive_skb_one_core+0x11a/0x130 netif_receive_skb+0x7b/0x260 tun_get_user+0x11bf/0x1c10 ------------[ cut here ]------------ Reject input route that is RTN_UNREACHABLE to fix it. The net warning is only printed for RTN_LOCAL, as RTN_UNREACHABLE is not the result of a race condition.

References

NVD — CVE-2026-98303 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-98303
git.kernel.org/stable/c/06083cea4a... WEB
https://git.kernel.org/stable/c/06083cea4a3b95f5ebc85312f97d7086e6c9e782
git.kernel.org/stable/c/1af2d87964... WEB
https://git.kernel.org/stable/c/1af2d87964d87ba7626d96928d68c09158b5a223
git.kernel.org/stable/c/2998147b59... WEB
https://git.kernel.org/stable/c/2998147b59c9df0a51477c7a6b3d1f0ba3127dd4
git.kernel.org/stable/c/83aa83f81a... WEB
https://git.kernel.org/stable/c/83aa83f81a8fec30ff5372dee60b2f0561bcb2ca
git.kernel.org/stable/c/cac69c5071... WEB
https://git.kernel.org/stable/c/cac69c50716c712ef0114837c9427da66066124c
git.kernel.org/stable/c/fda3000147... WEB
https://git.kernel.org/stable/c/fda3000147dc96c75ba162f680bec0a9fecf3037

Frequently Asked Questions

What is CVE-2026-98303?
CVE-2026-98303 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-98303?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-98303?
CVE-2026-98303 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-98303?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hw8j-26f4-2863",
  "modified" : "2026-10-06T09:31:34Z",
  "published" : "2026-10-06T09:31:34Z",
  "aliases" : [ "CVE-2026-98303" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: icmp: reject RTN_UNREACHABLE input routes in icmp_route_lookup\n\nWhen the forward output route cannot be used in icmp_route_lookup(),\nit enters the \"reverse path\" and calls ip_route_input() on fl4_dec.daddr,\nthe original packet's source address.\n\nip_route_input() only returns an error for truly invalid packets. For\nunreachable addresses it will succeed and return an input route whose\ndst.output is set to ip_rt_bug(). The existing check only rejects\nRTN_LOCAL routes, so the RTN_UNREACHABLE route types can still be returned\nand later used for output, syzkaller triggering a WARN_ON_ONCE()\nin ip_rt_bug() as bellow:\n\n ------------[ cut here ]------------\n WARNING: net/ipv4/route.c:1273 at ip_rt_bug+0x14/0x20\n RIP: 0010:ip_rt_bug+0x14/0x20\n Call Trace:\n  ip_push_pending_frames+0xfa/0x100\n  __icmp_send+0x905/0xf10\n  ip_options_compile+0xc0/0xd0\n  ip_rcv_finish_core+0x321/0xae0\n  ip_rcv+0x1de/0x260\n  __netif_receive_skb_one_core+0x11a/0x130\n  netif_receive_skb+0x7b/0x260\n  tun_get_user+0x11bf/0x1c10\n ------------[ cut here ]------------\n\nReject input route that is RTN_UNREACHABLE to fix it. The net warning\nis only printed for RTN_LOCAL, as RTN_UNREACHABLE is not the result of\na race condition.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98303"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/06083cea4a3b95f5ebc85312f97d7086e6c9e782"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1af2d87964d87ba7626d96928d68c09158b5a223"
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cac69c50716c712ef0114837c9427da66066124c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fda3000147dc96c75ba162f680bec0a9fecf3037"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-06T09:18:21Z"
  }
}