CVE-2026-98299: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-3ffw-pmr7-c5jp
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Advisory Summary

CVE-2026-98299 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-2026-98299 at a Glance

CVE Identifier CVE-2026-98299
GHSA Identifier GHSA-3ffw-pmr7-c5jp
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-2026-98299

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-2026-98299, 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: tcp: do not let tcp_rmem be set below 4096 We can hit a division by zero crash in tcp_rcvbuf_grow() and tcp_rcv_space_adjust(): divide error: 0000 [#1] PREEMPT SMP RIP: 0010:tcp_rcvbuf_grow+0x187/0x450 net/ipv4/tcp_input.c:939 ... grow = div_u64(((u64)rcvwin << 1) * (newval - oldval), oldval); The division uses oldval = tp->rcvq_space.space as divisor. When tp->rcvq_space.space is zero, this leads to a divide-by-zero exception. tp->rcvq_space.space is initialized in tcp_init_buffer_space(): tp->rcvq_space.space = min3(tp->rcv_ssthresh, tp->rcv_wnd, (u32)TCP_INIT_CWND * tp->advmss); If tcp_rmem[1] is configured to very small values (such as 1), sk->sk_rcvbuf is initialized to 1. Then tcp_full_space(sk), which computes (sk->sk_rcvbuf * scaling_ratio) >> 8, truncates to 0. This sets tp->window_clamp = 0, tp->rcv_ssthresh = 0, and tp->rcvq_space.space = 0. Later, when data arrives and DRS is invoked, tcp_rcvbuf_grow() divides by oldval == 0. Back in 2015, commit b1cb59cf2efe ("net: sysctl_net_core: check SNDBUF and RCVBUF for min length") ensured that net.core.rmem_default and net.core.rmem_max cannot be set below SOCK_MIN_RCVBUF. Similarly, SO_RCVBUF setsockopt enforces max_t(int, val * 2, SOCK_MIN_RCVBUF). However, net.ipv4.tcp_rmem still had .extra1 = SYSCTL_ONE, allowing arbitrarily small values. Because SOCK_MIN_RCVBUF depends on sizeof(struct sk_buff) and cacheline alignment, its value varies across architectures and configuration options. Using a fixed constant of 4096 ensures a predictable, architecture- independent lower bound that is safely above SOCK_MIN_RCVBUF everywhere and matches the documented 4K default. Fix this by setting tcp_rmem.extra1 to 4096 and updating the documentation.

References

NVD — CVE-2026-98299 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-98299
git.kernel.org/stable/c/1c4bb940c3... WEB
https://git.kernel.org/stable/c/1c4bb940c3bb4325bb88ac1b7eaf5faaa39e7d63
git.kernel.org/stable/c/60df201dbb... WEB
https://git.kernel.org/stable/c/60df201dbb19a1bf6478b56d100f7ae1fe90e46a
git.kernel.org/stable/c/67b83c15be... WEB
https://git.kernel.org/stable/c/67b83c15bed9eeeb8d1a6dbf88a5f79525970173
git.kernel.org/stable/c/7898bda1eb... WEB
https://git.kernel.org/stable/c/7898bda1ebc198f5559b301a96dd5398edd4d4d3
git.kernel.org/stable/c/83a945a529... WEB
https://git.kernel.org/stable/c/83a945a529d6e002dd7339c532288a931f463dba
git.kernel.org/stable/c/879907631b... WEB
https://git.kernel.org/stable/c/879907631b9e70eedb62d76461b29afa106ebe7a
git.kernel.org/stable/c/8e32532d0f... WEB
https://git.kernel.org/stable/c/8e32532d0fa3191ecf9524b0e6bafa0832e712ba
git.kernel.org/stable/c/9a4f49bf8d... WEB
https://git.kernel.org/stable/c/9a4f49bf8d2da4e52e904f60c29cca317bab9b3a

Frequently Asked Questions

What is CVE-2026-98299?
CVE-2026-98299 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-2026-98299?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-98299?
CVE-2026-98299 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-98299?
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-3ffw-pmr7-c5jp",
  "modified" : "2026-10-06T09:31:34Z",
  "published" : "2026-10-06T09:31:33Z",
  "aliases" : [ "CVE-2026-98299" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: do not let tcp_rmem be set below 4096\n\nWe can hit a division by zero crash in tcp_rcvbuf_grow()\nand tcp_rcv_space_adjust():\n\ndivide error: 0000 [#1] PREEMPT SMP\nRIP: 0010:tcp_rcvbuf_grow+0x187/0x450 net/ipv4/tcp_input.c:939\n...\ngrow = div_u64(((u64)rcvwin << 1) * (newval - oldval), oldval);\n\nThe division uses oldval = tp->rcvq_space.space as divisor.\nWhen tp->rcvq_space.space is zero, this leads to a divide-by-zero\nexception.\n\ntp->rcvq_space.space is initialized in tcp_init_buffer_space():\n    tp->rcvq_space.space = min3(tp->rcv_ssthresh, tp->rcv_wnd,\n                                (u32)TCP_INIT_CWND * tp->advmss);\n\nIf tcp_rmem[1] is configured to very small values (such as 1),\nsk->sk_rcvbuf is initialized to 1. Then tcp_full_space(sk), which\ncomputes (sk->sk_rcvbuf * scaling_ratio) >> 8, truncates to 0.\nThis sets tp->window_clamp = 0, tp->rcv_ssthresh = 0, and\ntp->rcvq_space.space = 0. Later, when data arrives and DRS is invoked,\ntcp_rcvbuf_grow() divides by oldval == 0.\n\nBack in 2015, commit b1cb59cf2efe (\"net: sysctl_net_core: check SNDBUF\nand RCVBUF for min length\") ensured that net.core.rmem_default and\nnet.core.rmem_max cannot be set below SOCK_MIN_RCVBUF. Similarly,\nSO_RCVBUF setsockopt enforces max_t(int, val * 2, SOCK_MIN_RCVBUF).\n\nHowever, net.ipv4.tcp_rmem still had .extra1 = SYSCTL_ONE, allowing\narbitrarily small values.\n\nBecause SOCK_MIN_RCVBUF depends on sizeof(struct sk_buff) and cacheline\nalignment, its value varies across architectures and configuration options.\nUsing a fixed constant of 4096 ensures a predictable, architecture-\nindependent lower bound that is safely above SOCK_MIN_RCVBUF everywhere\nand matches the documented 4K default.\n\nFix this by setting tcp_rmem.extra1 to 4096 and updating the documentation.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-98299"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1c4bb940c3bb4325bb88ac1b7eaf5faaa39e7d63"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/60df201dbb19a1bf6478b56d100f7ae1fe90e46a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/67b83c15bed9eeeb8d1a6dbf88a5f79525970173"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7898bda1ebc198f5559b301a96dd5398edd4d4d3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/83a945a529d6e002dd7339c532288a931f463dba"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/879907631b9e70eedb62d76461b29afa106ebe7a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8e32532d0fa3191ecf9524b0e6bafa0832e712ba"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9a4f49bf8d2da4e52e904f60c29cca317bab9b3a"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-10-06T09:18:20Z"
  }
}