CVE-2026-63875: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-h9hg-3wv2-x6j7
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CVSS 7.8
CWE-459
Published
Advisory Summary

CVE-2026-63875 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-459: Incomplete Cleanup) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not properly "clean up" and remove temporary or supporting resources after they have been used.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-63875 at a Glance

CVE Identifier CVE-2026-63875
GHSA Identifier GHSA-h9hg-3wv2-x6j7
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-459: Incomplete Cleanup
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-2026-63875

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-2026-63875, 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 CWE-459: Incomplete Cleanup, where the product does not properly "clean up" and remove temporary or supporting resources after they have been used. 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: arm64: tlb: Flush walk cache when unsharing PMD tables When huge_pmd_unshare() is called to unshare a PMD table, the tlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true but the aarch64 tlb_flush() only checked tlb->freed_tables to determine whether to use TLBF_NONE (vae1is, invalidates walk cache) or TLBF_NOWALKCACHE (vale1is, leaf-only). This caused the stale PMD page table entry to remain in the walk cache after unshare, potentially leading to incorrect page table walks. Fix by including unshared_tables in the check, so that when unsharing tables, TLBF_NONE is used and the walk cache is properly invalidated. Here is the detailed distinction between vae1is and vale1is: | Instruction Combination | Actual Invalidation Scope | | ------------------------ | --------------------------------------------------| | `VAE1IS` + TTL=`0` | All entries at all levels (full invalidation) | | `VAE1IS` + TTL=`2` (L2) | Non-leaf at Level 0/1 + leaf at Level 2 | | `VALE1IS` + TTL=`0` | Leaf entries at all levels (non-leaf not cleared) | | `VALE1IS` + TTL=`2` (L2) | Leaf entry at Level 2 only |

References

NVD — CVE-2026-63875 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63875
git.kernel.org/stable/c/0199c9d578... WEB
https://git.kernel.org/stable/c/0199c9d57861f17b556b6cba1f765c7cce79745b
git.kernel.org/stable/c/47490bbb05... WEB
https://git.kernel.org/stable/c/47490bbb05c8c0e09cc3cfd237d8934ffc340583
git.kernel.org/stable/c/48125cd9c5... WEB
https://git.kernel.org/stable/c/48125cd9c55cbe297b59fd1f9bda48b0960bd181
git.kernel.org/stable/c/8ca7284da0... WEB
https://git.kernel.org/stable/c/8ca7284da0e67b3e71d90ec17f08286774245ad9
git.kernel.org/stable/c/c2ff4764e0... WEB
https://git.kernel.org/stable/c/c2ff4764e03e7a8d758352f4aceb8fe1be6ac971
git.kernel.org/stable/c/d766a49d9b... WEB
https://git.kernel.org/stable/c/d766a49d9b55705c4737cd8bb5d3faa2d31330fd
git.kernel.org/stable/c/dced308d7d... WEB
https://git.kernel.org/stable/c/dced308d7d6a0de1c09d2058f38f1aaaf5cbb914
git.kernel.org/stable/c/fe93e907b1... WEB
https://git.kernel.org/stable/c/fe93e907b1af03cc229a80aa64a570a103d2b279

Frequently Asked Questions

What is CVE-2026-63875?
CVE-2026-63875 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-459: Incomplete Cleanup.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-63875?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-63875?
CVE-2026-63875 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-2026-63875?
CVE-2026-63875 is classified under CWE-459: Incomplete Cleanup (The product does not properly "clean up" and remove temporary or supporting resources after they have been used.).
How can I check Maven dependencies for CVE-2026-63875?
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 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-h9hg-3wv2-x6j7",
  "modified" : "2026-07-20T15:31:49Z",
  "published" : "2026-07-19T18:31:43Z",
  "aliases" : [ "CVE-2026-63875" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: tlb: Flush walk cache when unsharing PMD tables\n\nWhen huge_pmd_unshare() is called to unshare a PMD table, the\ntlb_unshare_pmd_ptdesc() function sets tlb->unshared_tables=true\nbut the aarch64 tlb_flush() only checked tlb->freed_tables to\ndetermine whether to use TLBF_NONE (vae1is, invalidates walk\ncache) or TLBF_NOWALKCACHE (vale1is, leaf-only).\n\nThis caused the stale PMD page table entry to remain in the walk cache\nafter unshare, potentially leading to incorrect page table walks.\n\nFix by including unshared_tables in the check, so that when\nunsharing tables, TLBF_NONE is used and the walk cache is properly\ninvalidated.\n\nHere is the detailed distinction between vae1is and vale1is:\n\n| Instruction Combination  | Actual Invalidation Scope                         |\n| ------------------------ | --------------------------------------------------|\n| `VAE1IS`  + TTL=`0`      | All entries at all levels (full invalidation)     |\n| `VAE1IS`  + TTL=`2` (L2) | Non-leaf at Level 0/1 + leaf at Level 2           |\n| `VALE1IS` + TTL=`0`      | Leaf entries at all levels (non-leaf not cleared) |\n| `VALE1IS` + TTL=`2` (L2) | Leaf entry at Level 2 only                        |",
  "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" : [ {
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    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63875"
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    "url" : "https://git.kernel.org/stable/c/0199c9d57861f17b556b6cba1f765c7cce79745b"
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  }, {
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    "url" : "https://git.kernel.org/stable/c/48125cd9c55cbe297b59fd1f9bda48b0960bd181"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8ca7284da0e67b3e71d90ec17f08286774245ad9"
  }, {
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  }, {
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    "url" : "https://git.kernel.org/stable/c/dced308d7d6a0de1c09d2058f38f1aaaf5cbb914"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fe93e907b1af03cc229a80aa64a570a103d2b279"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-459" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:04Z"
  }
}