{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63793",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-07-19T07:54:57.012Z",
        "datePublished": "2026-07-19T12:02:02.946Z",
        "dateUpdated": "2026-08-17T04:50:57.837Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T04:50:57.837Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: serialize volume label accesses\n\nProtect vol->volume_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->volume_label and FS_IOC_GETTSLABEL reads it\nconcurrently."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ntfs/file.c",
                        "fs/ntfs/super.c",
                        "fs/ntfs/volume.h"
                    ],
                    "versions": [
                        {
                            "version": "9c87959601e80b39a45250e362e6ddfec17cb0fa",
                            "lessThan": "acd744019460bad22e43d4569a502f9c88d331ae",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9c87959601e80b39a45250e362e6ddfec17cb0fa",
                            "lessThan": "e9e50ce4f13dc721014af622613409455c734942",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ntfs/file.c",
                        "fs/ntfs/super.c",
                        "fs/ntfs/volume.h"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.3",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.1.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/acd744019460bad22e43d4569a502f9c88d331ae"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e9e50ce4f13dc721014af622613409455c734942"
                }
            ],
            "title": "ntfs: serialize volume label accesses",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}