CVE-2026-98541: Software Security Vulnerability Vulnerability

UNKNOWN

Advisory Identifier: GHSA-rj48-hq74-h6fv

Published 2026-10-18

Advisory Summary

CVE-2026-98541 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-2026-98541 at a Glance

CVE Identifier CVE-2026-98541

GHSA Identifier GHSA-rj48-hq74-h6fv

Severity N/A

CVSS v3.1 Base Score N/A

CWE Classification General Security Weakness

Affected Product Software

Package Ecosystem Maven

Published Date 2026-10-18

Last Updated 2026-10-18

How to Fix CVE-2026-98541

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-2026-98541, 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: fou: reject omitted FOU_ATTR_IPPROTO on FOU_ENCAP_DIRECT Commit 7a9bc9e3f423 ("fou: Don't allow 0 for FOU_ATTR_IPPROTO.") added NLA_POLICY_MIN(NLA_U8, 1) to fou_nl_policy[FOU_ATTR_IPPROTO], which rejects an explicitly supplied FOU_ATTR_IPPROTO == 0 attribute with -ERANGE. However, FOU_ATTR_IPPROTO is an optional netlink attribute. When a user sends FOU_CMD_ADD with FOU_ATTR_TYPE set to FOU_ENCAP_DIRECT and omits FOU_ATTR_IPPROTO entirely, nla_policy validation succeeds and parse_nl_config() leaves cfg->protocol as 0 (from memset(cfg, 0, sizeof(*cfg))). fou_create() then creates a FOU_ENCAP_DIRECT socket with fou->protocol == 0. In fou_udp_recv(), returning -fou->protocol to udp_queue_rcv_one_skb() triggers IP protocol resubmission when fou->protocol > 0, whereas returning 0 tells the UDP tunnel layer that the skb was consumed without freeing it. When fou->protocol == 0, every packet received on the socket returns 0 from fou_udp_recv() and leaks the sk_buff. Reject FOU_ENCAP_DIRECT when !cfg->protocol in fou_create() so that creating a direct encapsulation port without FOU_ATTR_IPPROTO fails with -EINVAL while leaving FOU_CMD_DEL and FOU_CMD_GET (which share parse_nl_config()) unaffected. Tested in QEMU against Linux 7.3.0-rc3 by sending a FOU_CMD_ADD Generic Netlink request with FOU_ATTR_PORT = 5555 and FOU_ATTR_TYPE = FOU_ENCAP_DIRECT while omitting FOU_ATTR_IPPROTO. On the unfixed kernel, FOU_CMD_ADD succeeds (err = 0), FOU_CMD_GET reports fou->type = 1 and fou->protocol = 0, and sending 4000 UDP packets to 127.0.0.1:5555 leaks all 4000 sk_buffs (SUnreclaim in /proc/meminfo grows from 41456 kB to 59008 kB, +17552 kB); with this patch applied, FOU_CMD_ADD is rejected with -EINVAL (-22).

References

NVD — CVE-2026-98541 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-98541

git.kernel.org/stable/c/3bcc1624cc... WEB

https://git.kernel.org/stable/c/3bcc1624cc1cdcc05b566475d6e848093ab2a8f6

git.kernel.org/stable/c/46b1ffb7e1... WEB

https://git.kernel.org/stable/c/46b1ffb7e169c7e401dd890b29e55dbc261f8f01

git.kernel.org/stable/c/520cf06b8e... WEB

https://git.kernel.org/stable/c/520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221

git.kernel.org/stable/c/7f4ba56f5d... WEB

https://git.kernel.org/stable/c/7f4ba56f5d310dd018972916167985010a5d66a1

git.kernel.org/stable/c/8b43f40798... WEB

https://git.kernel.org/stable/c/8b43f40798bb2758489fbbcae7e841ad4443c213

git.kernel.org/stable/c/b1229b210e... WEB

https://git.kernel.org/stable/c/b1229b210ef5a39c58be665e6798203751411842

git.kernel.org/stable/c/d22609f3d1... WEB

https://git.kernel.org/stable/c/d22609f3d13fc5baacd92c222731b03c593401db

git.kernel.org/stable/c/fd20220f86... WEB

https://git.kernel.org/stable/c/fd20220f86947d66d4dba2d76f13a28dbd86ef30

Frequently Asked Questions

What is CVE-2026-98541?

CVE-2026-98541 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-2026-98541?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What CWE is associated with CVE-2026-98541?

CVE-2026-98541 is classified under General Security Weakness.

How can I check Maven dependencies for CVE-2026-98541?

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-rj48-hq74-h6fv",
  "modified" : "2026-10-18T18:31:53Z",
  "published" : "2026-10-18T18:31:53Z",
  "aliases" : [ "CVE-2026-98541" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: reject omitted FOU_ATTR_IPPROTO on FOU_ENCAP_DIRECT\n\nCommit 7a9bc9e3f423 (\"fou: Don't allow 0 for FOU_ATTR_IPPROTO.\") added\nNLA_POLICY_MIN(NLA_U8, 1) to fou_nl_policy[FOU_ATTR_IPPROTO], which\nrejects an explicitly supplied FOU_ATTR_IPPROTO == 0 attribute with\n-ERANGE.\n\nHowever, FOU_ATTR_IPPROTO is an optional netlink attribute. When a user\nsends FOU_CMD_ADD with FOU_ATTR_TYPE set to FOU_ENCAP_DIRECT and omits\nFOU_ATTR_IPPROTO entirely, nla_policy validation succeeds and\nparse_nl_config() leaves cfg->protocol as 0 (from memset(cfg, 0,\nsizeof(*cfg))). fou_create() then creates a FOU_ENCAP_DIRECT socket with\nfou->protocol == 0.\n\nIn fou_udp_recv(), returning -fou->protocol to udp_queue_rcv_one_skb()\ntriggers IP protocol resubmission when fou->protocol > 0, whereas\nreturning 0 tells the UDP tunnel layer that the skb was consumed without\nfreeing it. When fou->protocol == 0, every packet received on the socket\nreturns 0 from fou_udp_recv() and leaks the sk_buff.\n\nReject FOU_ENCAP_DIRECT when !cfg->protocol in fou_create() so that\ncreating a direct encapsulation port without FOU_ATTR_IPPROTO fails with\n-EINVAL while leaving FOU_CMD_DEL and FOU_CMD_GET (which share\nparse_nl_config()) unaffected.\n\nTested in QEMU against Linux 7.3.0-rc3 by sending a FOU_CMD_ADD Generic\nNetlink request with FOU_ATTR_PORT = 5555 and FOU_ATTR_TYPE =\nFOU_ENCAP_DIRECT while omitting FOU_ATTR_IPPROTO. On the unfixed kernel,\nFOU_CMD_ADD succeeds (err = 0), FOU_CMD_GET reports fou->type = 1 and\nfou->protocol = 0, and sending 4000 UDP packets to 127.0.0.1:5555 leaks\nall 4000 sk_buffs (SUnreclaim in /proc/meminfo grows from 41456 kB to\n59008 kB, +17552 kB); with this patch applied, FOU_CMD_ADD is rejected\nwith -EINVAL (-22).",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98541"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3bcc1624cc1cdcc05b566475d6e848093ab2a8f6"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/46b1ffb7e169c7e401dd890b29e55dbc261f8f01"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/520cf06b8ea0ba5bcc1b8b982ef07f02b5e56221"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7f4ba56f5d310dd018972916167985010a5d66a1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8b43f40798bb2758489fbbcae7e841ad4443c213"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b1229b210ef5a39c58be665e6798203751411842"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d22609f3d13fc5baacd92c222731b03c593401db"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fd20220f86947d66d4dba2d76f13a28dbd86ef30"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-18T16:17:05Z"
  }
}

Advisory Metadata

Source ID: GHSA-rj48-hq74-h6fv
Schema Version: 1.4.0
Published: 2026-10-18 18:31
Last Modified: 2026-10-18 18:31
Database Record File: advisories/unreviewed/2026/10/GHSA-rj48-hq74-h6fv/GHSA-rj48-hq74-h6fv.json