CVE-2026-89793: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-fp98-h54j-vwfj
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CVSS 7.8
Published
Advisory Summary

CVE-2026-89793 is a HIGH (CVSS 7.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89793 at a Glance

CVE Identifier CVE-2026-89793
GHSA Identifier GHSA-fp98-h54j-vwfj
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-89793

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-2026-89793, 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: ublk: clear VM_MAYWRITE on read-only ublk char device mmap ublk_ch_mmap() rejects mmap requests with VM_WRITE set, but never clears VM_MAYWRITE on the resulting read-only mapping. This allows a userspace daemon to mmap the per-queue command buffer PROT_READ, then upgrade it to PROT_WRITE via mprotect(), since VM_MAYWRITE was never cleared. The command buffer holds struct ublksrv_io_desc entries that are kernel-written ABI; a writable mapping lets an unprivileged daemon process corrupt fields such as addr, op_flags, nr_sectors, and start_sector. Same bug class as the drm/panthor and drm/vc4 VM_MAYWRITE fixes, and the 2026-08-13 ptp/vmclock fix (a5edadbae57e). Verified via mprotect() PoC: before the fix, a PROT_READ mapping can be upgraded to PROT_READ|PROT_WRITE and a write into the command buffer corrupts io_desc fields (confirmed under KASAN). After the fix, mprotect() returns -EACCES.

References

NVD — CVE-2026-89793 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89793
git.kernel.org/stable/c/5befd06a72... WEB
https://git.kernel.org/stable/c/5befd06a72216869b607cf7724a4f16c6a2d3999
git.kernel.org/stable/c/6e2b571b0a... WEB
https://git.kernel.org/stable/c/6e2b571b0a54755b06e092501913e1dfefe75d6c
git.kernel.org/stable/c/be41733c24... WEB
https://git.kernel.org/stable/c/be41733c24be58e2a1ef718c80fafdfb98a40d5e
git.kernel.org/stable/c/e373c1acdb... WEB
https://git.kernel.org/stable/c/e373c1acdbcf88cec533ece9f589020adaed0a78
git.kernel.org/stable/c/fa5e1bc673... WEB
https://git.kernel.org/stable/c/fa5e1bc673ca59722608af67b27e65dba0c97926

Frequently Asked Questions

What is CVE-2026-89793?
CVE-2026-89793 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-2026-89793?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89793?
CVE-2026-89793 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89793?
CVE-2026-89793 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89793?
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-fp98-h54j-vwfj",
  "modified" : "2026-09-16T15:30:57Z",
  "published" : "2026-09-16T12:30:33Z",
  "aliases" : [ "CVE-2026-89793" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: clear VM_MAYWRITE on read-only ublk char device mmap\n\nublk_ch_mmap() rejects mmap requests with VM_WRITE set, but never\nclears VM_MAYWRITE on the resulting read-only mapping. This allows\na userspace daemon to mmap the per-queue command buffer PROT_READ,\nthen upgrade it to PROT_WRITE via mprotect(), since VM_MAYWRITE was\nnever cleared.\n\nThe command buffer holds struct ublksrv_io_desc entries that are\nkernel-written ABI; a writable mapping lets an unprivileged daemon\nprocess corrupt fields such as addr, op_flags, nr_sectors, and\nstart_sector.\n\nSame bug class as the drm/panthor and drm/vc4 VM_MAYWRITE fixes, and\nthe 2026-08-13 ptp/vmclock fix (a5edadbae57e).\n\nVerified via mprotect() PoC: before the fix, a PROT_READ mapping can\nbe upgraded to PROT_READ|PROT_WRITE and a write into the command\nbuffer corrupts io_desc fields (confirmed under KASAN). After the\nfix, mprotect() returns -EACCES.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89793"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5befd06a72216869b607cf7724a4f16c6a2d3999"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6e2b571b0a54755b06e092501913e1dfefe75d6c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/be41733c24be58e2a1ef718c80fafdfb98a40d5e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e373c1acdbcf88cec533ece9f589020adaed0a78"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fa5e1bc673ca59722608af67b27e65dba0c97926"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T10:16:55Z"
  }
}