201 lines
11 KiB
JSON
201 lines
11 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-2025-68809",
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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": "2025-12-24T10:30:51.047Z",
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"datePublished": "2026-01-13T15:29:15.817Z",
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"dateUpdated": "2026-10-30T12:23:20.102Z"
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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": "2026-10-30T12:23:20.102Z"
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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\nksmbd: vfs: fix race on m_flags in vfs_cache\n\nksmbd maintains delete-on-close and pending-delete state in\nksmbd_inode->m_flags. In vfs_cache.c this field is accessed under\ninconsistent locking: some paths read and modify m_flags under\nci->m_lock while others do so without taking the lock at all.\n\nExamples:\n\n - ksmbd_query_inode_status() and __ksmbd_inode_close() use\n ci->m_lock when checking or updating m_flags.\n - ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(),\n ksmbd_clear_inode_pending_delete() and ksmbd_fd_set_delete_on_close()\n used to read and modify m_flags without ci->m_lock.\n\nThis creates a potential data race on m_flags when multiple threads\nopen, close and delete the same file concurrently. In the worst case\ndelete-on-close and pending-delete bits can be lost or observed in an\ninconsistent state, leading to confusing delete semantics (files that\nstay on disk after delete-on-close, or files that disappear while still\nin use).\n\nFix it by:\n\n - Making ksmbd_query_inode_status() look at m_flags under ci->m_lock\n after dropping inode_hash_lock.\n - Adding ci->m_lock protection to all helpers that read or modify\n m_flags (ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(),\n ksmbd_clear_inode_pending_delete(), ksmbd_fd_set_delete_on_close()).\n - Keeping the existing ci->m_lock protection in __ksmbd_inode_close(),\n and moving the actual unlink/xattr removal outside the lock.\n\nThis unifies the locking around m_flags and removes the data race while\npreserving the existing delete-on-close behaviour."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
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"baseScore": 9.1,
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"baseSeverity": "CRITICAL"
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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:N - The race is reachable through ksmbd SMB2 requests received over TCP, normally port 445, including CREATE, SET_INFO, QUERY_INFO, and CLOSE operations.\nAC:L - An attacker can control both sides by opening multiple handles to the same inode and issuing concurrent requests or disconnects that ksmbd processes on separate workers.\nPR:N - Although a valid session, writable tree connection, and delete-capable handle are normally required, ksmbd supports unauthenticated guest sessions and guest-writable shares. Such deployments let a remote attacker reach the race without possessing credentials.\nUI:N - The attacker can create the necessary handles, race the requests, and trigger final close without any victim action.\nS:U - The affected SMB server, filesystem operations, and resulting data impact remain within the host kernel's security authority.\nC:N - The raced field is an aligned unsigned flag word, and the affected operations neither expose data nor corrupt pointers, object lifetimes, or adjacent memory.\nI:H - Lost or stale pending-delete and delete-on-close bits can cause attacker-selected files, directories, or alternate data streams to be unlinked despite the intended state, producing persistent data loss in a critical writable share.\nA:H - Unexpected and repeatable deletion of operational files while they are in use can persistently make shared storage or dependent services unavailable."
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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/smb/server/vfs_cache.c"
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],
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"versions": [
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{
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"version": "f44158485826c076335d6860d35872271a83791d",
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"lessThan": "a4fd1fdf505facfae26b5654c9eff321f4cbc1a7",
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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": "f44158485826c076335d6860d35872271a83791d",
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"lessThan": "5adad9727a815c26013b0d41cfee92ffa7d4037c",
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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": "f44158485826c076335d6860d35872271a83791d",
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"lessThan": "ccc78781041589ea383e61d5d7a1e9a31b210b93",
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"status": "affected",
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{
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"lessThan": "ee63729760f5b61a66f345c54dc4c7514e62383d",
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"status": "affected",
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{
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"status": "affected",
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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/smb/server/vfs_cache.c"
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],
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"versions": [
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{
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"version": "5.15",
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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": "5.15",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.120",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.64",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.3",
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"lessThanOrEqual": "6.18.*",
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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": "6.19",
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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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"nodes": [
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"operator": "OR",
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"versionStartIncluding": "5.15",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a4fd1fdf505facfae26b5654c9eff321f4cbc1a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/5adad9727a815c26013b0d41cfee92ffa7d4037c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ccc78781041589ea383e61d5d7a1e9a31b210b93"
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{
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"url": "https://git.kernel.org/stable/c/ee63729760f5b61a66f345c54dc4c7514e62383d"
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},
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{
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"url": "https://git.kernel.org/stable/c/991f8a79db99b14c48d20d2052c82d65b9186cad"
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}
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],
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"title": "ksmbd: vfs: fix race on m_flags in vfs_cache",
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"x_generator": {
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}
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} |