CVE-2026-53393 Vulnerability Analysis & Exploit Details

CVE-2026-53393
Vulnerability Scoring

Analysis In Progress
Analysis In Progress

Attack Complexity Details

  • Attack Complexity:
    Attack Complexity Analysis In Progress
  • Attack Vector:
    Attack Vector Under Analysis
  • Privileges Required: None
    No authentication is required for exploitation.
  • Scope:
    Impact is confined to the initially vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-53393 Details

Status: Received on 19 Jul 2026, 12:16 UTC

Published on: 19 Jul 2026, 12:16 UTC

CVSS Release:

CVE-2026-53393 Vulnerability Summary

CVE-2026-53393: In the Linux kernel, the following vulnerability has been resolved: nfsd: reset write verifier on deferred writeback errors nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this check fails. Every other durable-storage-failure path in these functions calls commit_reset_write_verifier() before returning an error. The missing rotation means clients holding UNSTABLE write data under the current verifier will COMMIT, receive the unchanged verifier back, and conclude their data is durable — silently dropping data that failed writeback. This violates the UNSTABLE+COMMIT durability contract (RFC 1813 §3.3.7, RFC 8881 §18.32). Add commit_reset_write_verifier() calls at both filemap_check_wb_err() error sites, matching the pattern used by adjacent error paths in the same functions. The helper already filters -EAGAIN and -ESTALE internally, so the calls are unconditionally safe.

Assessing the Risk of CVE-2026-53393

Access Complexity Graph

The exploitability of CVE-2026-53393 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-2026-53393

No exploitability data is available for CVE-2026-53393.

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-2026-53393, 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-2026-53393, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-53393 does not compromise confidentiality.
  • Integrity: None
    CVE-2026-53393 does not impact data integrity.
  • Availability: None
    CVE-2026-53393 does not affect system availability.

CVE-2026-53393 References

External References

CWE Common Weakness Enumeration

Unknown

Protect Your Infrastructure against CVE-2026-53393: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2026-61246 – Vulnerability in the Oracle Platform Security for Java product of Oracle Fusion Middleware (component: Centralized Thirdparty Jars). Supported ver...
  • CVE-2026-60455 – Vulnerability in the Oracle Platform Security for Java product of Oracle Fusion Middleware (component: Centralized Thirdparty Jars). Supported ver...
  • CVE-2026-60439 – Vulnerability in the Oracle Platform Security for Java product of Oracle Fusion Middleware (component: Centralized Thirdparty Jars). Supported ver...
  • CVE-2026-60373 – Vulnerability in the Oracle Platform Security for Java product of Oracle Fusion Middleware (component: Centralized Thirdparty Jars). Supported ver...
  • CVE-2026-60372 – Vulnerability in the Oracle Platform Security for Java product of Oracle Fusion Middleware (component: Centralized Thirdparty Jars). Supported ver...