CVE-2026-63793 (GCVE-0-2026-63793)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:50
VLAI
Title
ntfs: serialize volume label accesses
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9c87959601e80b39a45250e362e6ddfec17cb0fa , < acd744019460bad22e43d4569a502f9c88d331ae (git)
Affected: 9c87959601e80b39a45250e362e6ddfec17cb0fa , < e9e50ce4f13dc721014af622613409455c734942 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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          "product": "Linux",
          "programFiles": [
            "fs/ntfs/file.c",
            "fs/ntfs/super.c",
            "fs/ntfs/volume.h"
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              "value": "AV:L - The vulnerability is reached only through the local ioctl(2) syscall on an open file or directory on a mounted legacy NTFS (fs/ntfs) volume; there is no network-facing code path to these handlers.\nAC:L - An attacker controls both sides of the race by concurrently issuing FS_IOC_SETFSLABEL and FS_IOC_GETFSLABEL from separate threads or file descriptors, making the use-after-free reliably triggerable without conditions outside attacker control.\nPR:L - Exploitation requires CAP_SYS_ADMIN to call FS_IOC_SETFSLABEL (which performs the kfree), but that capability is obtainable by an unprivileged user via user namespaces or privileged containers, and mounting NTFS for ioctl access does not require init-namespace root.\nUI:N - No victim interaction is required; the attacker opens a file on the NTFS mount and races the label get/set ioctls themselves, including on auto-mounted dual-boot or shared-workstation NTFS partitions.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority and does not cross VM, container, or IOMMU boundaries on its own.\nC:H - The bug is a kmalloc use-after-free where the read path calls strlen() and copy_to_user() on freed memory, enabling disclosure of adjacent heap contents to userspace and supporting further info-leak primitives.\nI:H - Use-after-free on a kmalloc-allocated volume label string is a standard heap corruption primitive that can be groomed for arbitrary kernel memory writes and potential privilege escalation or code execution.\nA:H - Concurrent access to the freed label pointer can cause kernel oopses or panics during strlen() or copy_to_user(), and UAF corruption inherently threatens system availability even before full exploitation."
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    "dateReserved": "2026-07-19T07:54:57.012Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: serialize volume label accesses\n\nProtect vol-\u003evolume_label with a mutex and snaphost the label before\ncopy_to_user. This prevent a use-after-free when FS_IOC_SETFSLABEL\nreplaces the vol-\u003evolume_label and FS_IOC_GETTSLABEL reads it\nconcurrently."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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