CVE-2026-64108 Vulnerability Analysis & Exploit Details

CVE-2026-64108
Vulnerability Scoring

7.8
/10
Very High Risk

Highly exploitable, CVE-2026-64108 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-64108 Details

Status: Analyzed

Last updated: 🕒 12 Aug 2026, 15:14 UTC
Originally published on: 🕓 19 Jul 2026, 16:17 UTC

Time between publication and last update: 23 days

CVSS Release: version 3

CVSS3 Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2026-64108 Vulnerability Summary

CVE-2026-64108: In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cifs_new_fileinfo cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2 close(fd) __fput cifs_close queue_delayed_work(deferredclose_wq, cfile->deferred) dput(dentry) // dentry->d_lockref.count = 1 smb2_deferred_work_close _cifsFileInfo_put list_del(&cifs_file->flist) umount cleanup_mnt deactivate_super cifs_kill_sb cifs_close_all_deferred_files_sb cifs_close_all_deferred_files // cannot find cfile, skip _cifsFileInfo_put kill_anon_super generic_shutdown_super shrink_dcache_for_umount umount_check WARN ! // dentry->d_lockref.count = 1 cifsFileInfo_put_final dput(cifs_file->dentry) // dentry->d_lockref.count = 0 Fix it by flushing 'deferredclose_wq' before calling kill_anon_super. Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.

Assessing the Risk of CVE-2026-64108

Access Complexity Graph

The exploitability of CVE-2026-64108 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-64108

CVE-2026-64108 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-64108, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-64108, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-64108 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-64108 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2026-64108 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-64108 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:6.1.167:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.167:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.168:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.168:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.169:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.169:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.170:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.170:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.171:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.171:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.173:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.173:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.174:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.174:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.130:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.130:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.131:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.131:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.133:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.133:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.134:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.134:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.135:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.135:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.136:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.136:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.137:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.137:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.138:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.138:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.139:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.139:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.140:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.140:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.141:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.141:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.78:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.78:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.80:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.80:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.81:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.81:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.82:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.82:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.83:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.83:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.84:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.84:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.85:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.85:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.86:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.86:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.87:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.87:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.88:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.88:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.89:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.89:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.90:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.90:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.91:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.91:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.23:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.23:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.24:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.24:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.25:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.25:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.26:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.26:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.27:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.27:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.28:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.28:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.29:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.29:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.30:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.30:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.31:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.31:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.32:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.32:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*

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