CVE-2026-63826: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-qmc7-p94r-m2hm
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Advisory Summary

CVE-2026-63826 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-2026-63826 at a Glance

CVE Identifier CVE-2026-63826
GHSA Identifier GHSA-qmc7-p94r-m2hm
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-2026-63826

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-2026-63826, 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: fbdev: fix use-after-free in store_modes() store_modes() replaces a framebuffer's modelist with modes from userspace. On success it frees the old modelist with fb_destroy_modelist(). Two fields still point into that freed list. One pointer is fb_display[i].mode, the mode a console is using. fbcon_new_modelist() moves these pointers to the new list. It only does so for consoles still mapped to the framebuffer. An unmapped console is skipped and keeps its stale pointer. Unbinding fbcon, for example, sets con2fb_map[i] to -1 but leaves fb_display[i].mode set. An FBIOPUT_VSCREENINFO ioctl with FB_ACTIVATE_INV_MODE later reaches fbcon_mode_deleted(). That function reads the stale fb_display[i].mode through fb_mode_is_equal(). The read is a use-after-free. The other pointer is fb_info->mode, the current mode. It is set through the mode sysfs attribute. store_modes() does not update fb_info->mode, so it is left pointing into the freed list. show_mode(), the attribute's read handler, dereferences the stale fb_info->mode through mode_string(). The read is a use-after-free. Clear both pointers before freeing the list. Commit a1f305893074 ("fbcon: Set fb_display[i]->mode to NULL when the mode is released") added the helper fbcon_delete_modelist(). It clears every fb_display[i].mode that points into a given list. So far it is called only from the unregister path. Call it from store_modes() too, and set fb_info->mode to NULL.

References

NVD — CVE-2026-63826 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63826
git.kernel.org/stable/c/0d35f9f194... WEB
https://git.kernel.org/stable/c/0d35f9f194a858567a21017d69318a51e3a822b9
git.kernel.org/stable/c/2c1c805c65... WEB
https://git.kernel.org/stable/c/2c1c805c65fb7dc7524e20376d6987721e73a0b1
git.kernel.org/stable/c/5267eab88f... WEB
https://git.kernel.org/stable/c/5267eab88fa4c684459504b8be577ad64953b9a6
git.kernel.org/stable/c/70f1e000b8... WEB
https://git.kernel.org/stable/c/70f1e000b88cfa8ca3fd7f4d082647fc089a7769
git.kernel.org/stable/c/c6765f39ed... WEB
https://git.kernel.org/stable/c/c6765f39ed27014ff877b00a2efa494233404e17

Frequently Asked Questions

What is CVE-2026-63826?
CVE-2026-63826 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-2026-63826?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63826?
CVE-2026-63826 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-63826?
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-qmc7-p94r-m2hm",
  "modified" : "2026-07-19T12:30:24Z",
  "published" : "2026-07-19T12:30:24Z",
  "aliases" : [ "CVE-2026-63826" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: fix use-after-free in store_modes()\n\nstore_modes() replaces a framebuffer's modelist with modes from userspace.\nOn success it frees the old modelist with fb_destroy_modelist(). Two\nfields still point into that freed list.\n\nOne pointer is fb_display[i].mode, the mode a console is using.\nfbcon_new_modelist() moves these pointers to the new list. It only does so\nfor consoles still mapped to the framebuffer. An unmapped console is\nskipped and keeps its stale pointer. Unbinding fbcon, for example, sets\ncon2fb_map[i] to -1 but leaves fb_display[i].mode set. An\nFBIOPUT_VSCREENINFO ioctl with FB_ACTIVATE_INV_MODE later reaches\nfbcon_mode_deleted(). That function reads the stale fb_display[i].mode\nthrough fb_mode_is_equal(). The read is a use-after-free.\n\nThe other pointer is fb_info->mode, the current mode. It is set through\nthe mode sysfs attribute. store_modes() does not update fb_info->mode, so\nit is left pointing into the freed list. show_mode(), the attribute's read\nhandler, dereferences the stale fb_info->mode through mode_string(). The\nread is a use-after-free.\n\nClear both pointers before freeing the list. Commit a1f305893074 (\"fbcon:\nSet fb_display[i]->mode to NULL when the mode is released\") added the\nhelper fbcon_delete_modelist(). It clears every fb_display[i].mode that\npoints into a given list. So far it is called only from the unregister\npath. Call it from store_modes() too, and set fb_info->mode to NULL.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63826"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0d35f9f194a858567a21017d69318a51e3a822b9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2c1c805c65fb7dc7524e20376d6987721e73a0b1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5267eab88fa4c684459504b8be577ad64953b9a6"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/70f1e000b88cfa8ca3fd7f4d082647fc089a7769"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c6765f39ed27014ff877b00a2efa494233404e17"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T12:16:55Z"
  }
}