CVE-2026-89984: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-jjjc-8r8p-gw7x
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Advisory Summary

CVE-2026-89984 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-2026-89984 at a Glance

CVE Identifier CVE-2026-89984
GHSA Identifier GHSA-jjjc-8r8p-gw7x
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-2026-89984

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-2026-89984, 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: perf/x86/intel: Fix kernel address leakages in LBR stack Before Arch LBR gained CPL filtering support, a user-only branch stack could still contain kernel addresses. As a result, kernel branch records may be exposed to user space even when PERF_SAMPLE_BRANCH_USER is requested. For example, on Intel Tiger Lake, the following command can still report SYSRET/ERET entries with kernel-space from addresses: $ ./perf record -e cycles:p -o - --branch-filter any,save_type,u -- \ ./perf bench syscall basic --loop 1000 | \ ./perf script -i - --fields brstack|tr ' ' '\n'| \ grep -E '0x[89a-f][0-9a-f]{15}' Total time: 0.000 [sec] 0.219000 usecs/op 4,566,210 ops/sec [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.551 MB - ] 0xffffffff93c001c8/0x7f12a2b1d647/P/-/-/16959/SYSRET/- 0xffffffff93c001c8/0x7f12a2b1d5c2/P/-/-/17535/SYSRET/- 0xffffffff93c01928/0x7f12a2861000/P/-/-/6719/ERET/- 0xffffffff93c01928/0x7f12a297a000/P/-/-/8575/ERET/- The problem is that intel_pmu_lbr_filter() does not fully validate the privilege level of sampled entries. It filters some mismatches based on the branch type and the to address, but it does not reject entries whose from address violates the requested branch privilege filter. Fix this by extending software filtering to validate both from and to addresses against br_sel. Any LBR entry contains kernel address does not match the requested user filter is dropped. This prevents kernel addresses from appearing in user-only branch stacks.

References

NVD — CVE-2026-89984 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89984
git.kernel.org/stable/c/3c492c8eba... WEB
https://git.kernel.org/stable/c/3c492c8eba02698ca893a9a13388d2adf6dfb839
git.kernel.org/stable/c/68c4b780b2... WEB
https://git.kernel.org/stable/c/68c4b780b266a435261a1e029bede5ee3c2735cc
git.kernel.org/stable/c/6ac26161db... WEB
https://git.kernel.org/stable/c/6ac26161db27f7fb9d9e89ae240dbe52795496cc
git.kernel.org/stable/c/b589147f54... WEB
https://git.kernel.org/stable/c/b589147f54adc62e4172e4acf079ad5fb7b3687f
git.kernel.org/stable/c/be0628a101... WEB
https://git.kernel.org/stable/c/be0628a101ac05b085aaa4f650d48bd3915e80fa
git.kernel.org/stable/c/ca19a175e8... WEB
https://git.kernel.org/stable/c/ca19a175e89b7de604fab736436cbab74030b47a
git.kernel.org/stable/c/e2b0575900... WEB
https://git.kernel.org/stable/c/e2b0575900ff72aa82748af96e7bd564ade5157a
git.kernel.org/stable/c/f3705db4e6... WEB
https://git.kernel.org/stable/c/f3705db4e6378cc1b91a38ce0fe2f879055e23ca

Frequently Asked Questions

What is CVE-2026-89984?
CVE-2026-89984 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-2026-89984?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-89984?
CVE-2026-89984 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89984?
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-jjjc-8r8p-gw7x",
  "modified" : "2026-09-16T12:30:44Z",
  "published" : "2026-09-16T12:30:44Z",
  "aliases" : [ "CVE-2026-89984" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Fix kernel address leakages in LBR stack\n\nBefore Arch LBR gained CPL filtering support, a user-only branch stack\ncould still contain kernel addresses. As a result, kernel branch records\nmay be exposed to user space even when PERF_SAMPLE_BRANCH_USER is\nrequested.\n\nFor example, on Intel Tiger Lake, the following command can still report\nSYSRET/ERET entries with kernel-space from addresses:\n\n$ ./perf record -e cycles:p -o - --branch-filter any,save_type,u -- \\\n \t./perf bench syscall basic --loop 1000 | \\\n\t./perf script -i - --fields brstack|tr ' ' '\\n'| \\\n\tgrep -E '0x[89a-f][0-9a-f]{15}'\n\n    Total time: 0.000 [sec]\n\n      0.219000 usecs/op\n     4,566,210 ops/sec\n[ perf record: Woken up 1 times to write data ]\n[ perf record: Captured and wrote 0.551 MB - ]\n0xffffffff93c001c8/0x7f12a2b1d647/P/-/-/16959/SYSRET/-\n0xffffffff93c001c8/0x7f12a2b1d5c2/P/-/-/17535/SYSRET/-\n0xffffffff93c01928/0x7f12a2861000/P/-/-/6719/ERET/-\n0xffffffff93c01928/0x7f12a297a000/P/-/-/8575/ERET/-\n\nThe problem is that intel_pmu_lbr_filter() does not fully validate the\nprivilege level of sampled entries. It filters some mismatches based on\nthe branch type and the to address, but it does not reject entries whose\nfrom address violates the requested branch privilege filter.\n\nFix this by extending software filtering to validate both from and to\naddresses against br_sel. Any LBR entry contains kernel address does not\nmatch the requested user filter is dropped. This prevents kernel\naddresses from appearing in user-only branch stacks.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89984"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3c492c8eba02698ca893a9a13388d2adf6dfb839"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/68c4b780b266a435261a1e029bede5ee3c2735cc"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6ac26161db27f7fb9d9e89ae240dbe52795496cc"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b589147f54adc62e4172e4acf079ad5fb7b3687f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/be0628a101ac05b085aaa4f650d48bd3915e80fa"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ca19a175e89b7de604fab736436cbab74030b47a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e2b0575900ff72aa82748af96e7bd564ade5157a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f3705db4e6378cc1b91a38ce0fe2f879055e23ca"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T11:17:09Z"
  }
}