CVE-2026-63793

Analyzed Analyzed - Analysis Complete

NTFS Volume Label Race Condition Fix

Publication date: 2026-07-19

Last updated on: 2026-07-30

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: serialize volume label accesses Protect vol->volume_label with a mutex and snaphost the label before copy_to_user. This prevent a use-after-free when FS_IOC_SETFSLABEL replaces the vol->volume_label and FS_IOC_GETTSLABEL reads it concurrently.

CVSS Scores

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Meta Information

Published

2026-07-19

Last Modified

2026-07-30

Generated

2026-08-09

AI Q&A

2026-07-19

EPSS Evaluated

2026-08-08

NVD

CVE-2026-63793

EUVD

EUVD-2026-45459

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 7.1 (inc) to 7.1.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a use-after-free issue in the NTFS file system. It occurs when the volume label is accessed concurrently by two operations: FS_IOC_SETFSLABEL (which replaces the label) and FS_IOC_GETTSLABEL (which reads the label). Without proper synchronization, this can lead to a use-after-free condition where the label is freed while still being accessed.

Detection Guidance

This vulnerability is specific to the Linux kernel's NTFS implementation and involves a use-after-free condition during concurrent access to volume labels. Detection requires checking kernel version and NTFS-related processes. Use 'uname -a' to check kernel version and 'lsmod | grep ntfs' to verify NTFS module loading. Monitor kernel logs for NTFS-related errors with 'dmesg | grep -i ntfs'.

Impact Analysis

This vulnerability could allow an attacker to cause a system crash or execute arbitrary code with kernel privileges by exploiting the race condition during label access. This may lead to denial-of-service or potential privilege escalation on affected systems.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it involves a use-after-free issue in the Linux kernel's NTFS filesystem related to volume label access serialization. No evidence suggests it impacts data protection, privacy, or security controls required by these regulations.

Mitigation Strategies

Apply the latest kernel update from your distribution to patch the NTFS use-after-free vulnerability. If immediate patching is not possible, avoid concurrent use of FS_IOC_SETFSLABEL and FS_IOC_GETFSLABEL commands. Restrict access to these ioctl operations if feasible.

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