CVE-2026-98621: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-2cjw-phmm-3745
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Advisory Summary

CVE-2026-98621 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-2026-98621 at a Glance

CVE Identifier CVE-2026-98621
GHSA Identifier GHSA-2cjw-phmm-3745
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-2026-98621

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-2026-98621, 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: net: gue: reject invalid REMCSUM offsets The REMCSUM option carries an absolute checksum start and checksum field offset. gue_remcsum() passes them to skb_remcsum_process(), whose partial path stores offset - start in the u16 skb->csum_offset variable. If offset is less than start, this underflows. A forwarded packet can retain CHECKSUM_PARTIAL and reach a NETIF_F_HW_CSUM driver which trusts the metadata, leading skb_copy_and_csum_dev() to write two bytes about 64 KiB beyond the destination buffer. Reject reversed tuples in validate_gue_flags(), after the existing length validation, so all GUE parsers enforce the ordering in one place.

References

NVD — CVE-2026-98621 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-98621
git.kernel.org/stable/c/1d664be4ca... WEB
https://git.kernel.org/stable/c/1d664be4ca49d1696e85239236f4988dfc4653c3
git.kernel.org/stable/c/1eeec0c51f... WEB
https://git.kernel.org/stable/c/1eeec0c51fd5598da44080ed96bbd9880021c28b
git.kernel.org/stable/c/2566866fc3... WEB
https://git.kernel.org/stable/c/2566866fc30965d915d0b52b5c3323b362619f0e
git.kernel.org/stable/c/40aeafbcbc... WEB
https://git.kernel.org/stable/c/40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f
git.kernel.org/stable/c/43efb1f997... WEB
https://git.kernel.org/stable/c/43efb1f997e976f386aa89716f55870cd2cff9ad
git.kernel.org/stable/c/4b9bc21b23... WEB
https://git.kernel.org/stable/c/4b9bc21b2396c396d88dd909caaf73d5be6ff593
git.kernel.org/stable/c/97f9072033... WEB
https://git.kernel.org/stable/c/97f907203321eee2cc9132d5c9eb47698fb41d35
git.kernel.org/stable/c/c20f755338... WEB
https://git.kernel.org/stable/c/c20f755338ca234e523dfc943719f194dfc1f903

Frequently Asked Questions

What is CVE-2026-98621?
CVE-2026-98621 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-2026-98621?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-98621?
CVE-2026-98621 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-98621?
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-2cjw-phmm-3745",
  "modified" : "2026-10-18T18:31:57Z",
  "published" : "2026-10-18T18:31:56Z",
  "aliases" : [ "CVE-2026-98621" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gue: reject invalid REMCSUM offsets\n\nThe REMCSUM option carries an absolute checksum start and checksum field\noffset. gue_remcsum() passes them to skb_remcsum_process(), whose\npartial path stores offset - start in the u16 skb->csum_offset variable.\nIf offset is less than start, this underflows.\n\nA forwarded packet can retain CHECKSUM_PARTIAL and reach a NETIF_F_HW_CSUM\ndriver which trusts the metadata, leading skb_copy_and_csum_dev() to write\ntwo bytes about 64 KiB beyond the destination buffer.\n\nReject reversed tuples in validate_gue_flags(), after the existing length\nvalidation, so all GUE parsers enforce the ordering in one place.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98621"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1d664be4ca49d1696e85239236f4988dfc4653c3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1eeec0c51fd5598da44080ed96bbd9880021c28b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2566866fc30965d915d0b52b5c3323b362619f0e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/43efb1f997e976f386aa89716f55870cd2cff9ad"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/4b9bc21b2396c396d88dd909caaf73d5be6ff593"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/97f907203321eee2cc9132d5c9eb47698fb41d35"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c20f755338ca234e523dfc943719f194dfc1f903"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-18T16:17:14Z"
  }
}