CVE-2026-93208: Software Security Vulnerability Vulnerability

UNKNOWN

Advisory Identifier: GHSA-fgp6-x4jf-pff3

Published 2026-09-24

Advisory Summary

CVE-2026-93208 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-2026-93208 at a Glance

CVE Identifier CVE-2026-93208

GHSA Identifier GHSA-fgp6-x4jf-pff3

Severity N/A

CVSS v3.1 Base Score N/A

CWE Classification General Security Weakness

Affected Product Software

Package Ecosystem Maven

Published Date 2026-09-24

Last Updated 2026-09-24

How to Fix CVE-2026-93208

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-2026-93208, 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: kasan: fix cache shrink race with CPU hotplug kasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on all online CPUs. Each callback moves objects belonging to the cache from cpu_quarantine to the CPU's shrink_qlist, where they can later be freed from task context. kmem_cache_destroy() invokes the quarantine removal path while holding cpus_read_lock(), but kmem_cache_shrink() does not. The latter can therefore race with CPU offlining as follows: kmem_cache_shrink() CPU hotplug ------------------- ----------- on_each_cpu() CPU1 moves objects to CPU1's shrink_qlist on_each_cpu() returns CPU1 goes offline kasan_cpu_offline() drains cpu_quarantine leaves shrink_qlist untouched for_each_online_cpu() skips CPU1 The objects left on CPU1's shrink_qlist are not returned to the slab allocator. This may prevent kmem_cache_shrink() from releasing slabs that would otherwise become empty. If CPU1 remains offline, a later kmem_cache_destroy() also skips the list and can report that the cache still contains objects. An intermittent occurrence was observed with a virtio-9p filesystem. The mount and umount commands both returned 0, but the kernel logged the following during the userspace-triggered teardown: [ 2994.380134][ T111] BUG 9p-fcall-cache-1 (Tainted: G B ): Objects remaining on __kmem_cache_shutdown() [ 2994.381140][ T111] Object 0xff11000004361118 @offset=4376 [ 2994.381607][ T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104 [ 2994.382591][ T111] p9_fcall_init+0x201/0x400 [ 2994.382810][ T111] p9_tag_alloc+0x12f/0x700 [ 2994.382982][ T111] p9_client_prepare_req+0x102/0x3e0 [ 2994.383165][ T111] p9_client_rpc+0x1ab/0xa50 [ 2994.383334][ T111] p9_client_getattr_dotl+0xb0/0x1a0 [ 2994.383515][ T111] v9fs_vfs_getattr_dotl+0x115/0x360 [ 2994.383719][ T111] vfs_getattr_nosec+0x22c/0x3a0 [ 2994.383910][ T111] vfs_statx+0xd7/0x170 [ 2994.384062][ T111] vfs_fstatat+0x45/0x80 [ 2994.384215][ T111] __do_sys_newfstatat+0x84/0xe0 [ 2994.384386][ T111] do_syscall_64+0x115/0x6a0 [ 2994.384566][ T111] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 2994.399720][ T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111 [ 2994.405655][ T111] Call Trace: [ 2994.406325][ T111] kmem_cache_destroy+0x73/0x1b0 [ 2994.406630][ T111] p9_client_destroy+0x271/0x3c0 [ 2994.407210][ T111] v9fs_session_close+0x3c/0x260 [ 2994.407409][ T111] v9fs_kill_super+0x48/0x90 [ 2994.407584][ T111] deactivate_locked_super+0xa3/0x160 [ 2994.407778][ T111] cleanup_mnt+0x1dd/0x3e0 Thus, a successful umount left objects in the 9p fcall cache and prevented the cache from being destroyed cleanly. Per-CPU shrink_qlist storage exists for every possible CPU, and each list is protected by its own raw spinlock. Iterate over possible CPUs so that a list populated before its CPU went offline is drained as well. for_each_possible_cpu() can do more work than for_each_online_cpu(), but this change only affects CONFIG_KASAN_GENERIC kernels. The extra work is limited to cache shrink and cache destruction paths and does not affect the normal allocation/free fast path. It adds one raw-spinlock-protected scan of each possible CPU's shrink list. These lists are normally empty; a non-empty list is traversed to remove objects belonging to the cache being shrunk or destroyed.

References

NVD — CVE-2026-93208 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-93208

git.kernel.org/stable/c/30e8cb8598... WEB

https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3

git.kernel.org/stable/c/3119d58e4e... WEB

https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b

git.kernel.org/stable/c/709c364654... WEB

https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98

git.kernel.org/stable/c/7cd164f0e1... WEB

https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a

git.kernel.org/stable/c/8790303cba... WEB

https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525

Frequently Asked Questions

What is CVE-2026-93208?

CVE-2026-93208 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-2026-93208?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What CWE is associated with CVE-2026-93208?

CVE-2026-93208 is classified under General Security Weakness.

How can I check Maven dependencies for CVE-2026-93208?

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-fgp6-x4jf-pff3",
  "modified" : "2026-09-24T18:31:22Z",
  "published" : "2026-09-24T18:31:22Z",
  "aliases" : [ "CVE-2026-93208" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nkasan: fix cache shrink race with CPU hotplug\n\nkasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on\nall online CPUs.  Each callback moves objects belonging to the cache from\ncpu_quarantine to the CPU's shrink_qlist, where they can later be freed\nfrom task context.\n\nkmem_cache_destroy() invokes the quarantine removal path while holding\ncpus_read_lock(), but kmem_cache_shrink() does not.  The latter can\ntherefore race with CPU offlining as follows:\n\n  kmem_cache_shrink()             CPU hotplug\n  -------------------             -----------\n  on_each_cpu()\n    CPU1 moves objects to\n    CPU1's shrink_qlist\n  on_each_cpu() returns\n                                  CPU1 goes offline\n                                  kasan_cpu_offline()\n                                    drains cpu_quarantine\n                                    leaves shrink_qlist untouched\n  for_each_online_cpu()\n    skips CPU1\n\nThe objects left on CPU1's shrink_qlist are not returned to the slab\nallocator.  This may prevent kmem_cache_shrink() from releasing slabs that\nwould otherwise become empty.  If CPU1 remains offline, a later\nkmem_cache_destroy() also skips the list and can report that the cache\nstill contains objects.\n\nAn intermittent occurrence was observed with a virtio-9p filesystem.  The\nmount and umount commands both returned 0, but the kernel logged the\nfollowing during the userspace-triggered teardown:\n\n  [  2994.380134][  T111] BUG 9p-fcall-cache-1 (Tainted: G    B              ): Objects remaining on __kmem_cache_shutdown()\n  [  2994.381140][  T111] Object 0xff11000004361118 @offset=4376\n  [  2994.381607][  T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104\n  [  2994.382591][  T111]  p9_fcall_init+0x201/0x400\n  [  2994.382810][  T111]  p9_tag_alloc+0x12f/0x700\n  [  2994.382982][  T111]  p9_client_prepare_req+0x102/0x3e0\n  [  2994.383165][  T111]  p9_client_rpc+0x1ab/0xa50\n  [  2994.383334][  T111]  p9_client_getattr_dotl+0xb0/0x1a0\n  [  2994.383515][  T111]  v9fs_vfs_getattr_dotl+0x115/0x360\n  [  2994.383719][  T111]  vfs_getattr_nosec+0x22c/0x3a0\n  [  2994.383910][  T111]  vfs_statx+0xd7/0x170\n  [  2994.384062][  T111]  vfs_fstatat+0x45/0x80\n  [  2994.384215][  T111]  __do_sys_newfstatat+0x84/0xe0\n  [  2994.384386][  T111]  do_syscall_64+0x115/0x6a0\n  [  2994.384566][  T111]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  [  2994.399720][  T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111\n  [  2994.405655][  T111] Call Trace:\n  [  2994.406325][  T111]  kmem_cache_destroy+0x73/0x1b0\n  [  2994.406630][  T111]  p9_client_destroy+0x271/0x3c0\n  [  2994.407210][  T111]  v9fs_session_close+0x3c/0x260\n  [  2994.407409][  T111]  v9fs_kill_super+0x48/0x90\n  [  2994.407584][  T111]  deactivate_locked_super+0xa3/0x160\n  [  2994.407778][  T111]  cleanup_mnt+0x1dd/0x3e0\n\nThus, a successful umount left objects in the 9p fcall cache and prevented\nthe cache from being destroyed cleanly.\n\nPer-CPU shrink_qlist storage exists for every possible CPU, and each list\nis protected by its own raw spinlock.  Iterate over possible CPUs so that\na list populated before its CPU went offline is drained as well.\n\nfor_each_possible_cpu() can do more work than for_each_online_cpu(), but\nthis change only affects CONFIG_KASAN_GENERIC kernels.  The extra work is\nlimited to cache shrink and cache destruction paths and does not affect\nthe normal allocation/free fast path.  It adds one raw-spinlock-protected\nscan of each possible CPU's shrink list.  These lists are normally empty;\na non-empty list is traversed to remove objects belonging to the cache\nbeing shrunk or destroyed.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-93208"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-24T16:17:15Z"
  }
}

Advisory Metadata

Source ID: GHSA-fgp6-x4jf-pff3
Schema Version: 1.4.0
Published: 2026-09-24 18:31
Last Modified: 2026-09-24 18:31
Database Record File: advisories/unreviewed/2026/09/GHSA-fgp6-x4jf-pff3/GHSA-fgp6-x4jf-pff3.json