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