277 lines
15 KiB
JSON
277 lines
15 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-2026-74359",
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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": "2026-08-15T05:44:03.887Z",
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"datePublished": "2026-08-15T05:58:43.456Z",
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"dateUpdated": "2026-10-16T18:55:35.328Z"
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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": "2026-08-17T05:46:19.411Z"
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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\nconfigfs_lookup(): don't leave ->s_dentry dangling on failure\n\nNormally ->s_dentry is cleared when dentry it's pointing to becomes\nnegative (on eviction, realistically). However, that only happens\nif dentry gets to be positive in the first place; in case of inode\nallocation failure dentry never becomes positive, so ->d_iput()\nis not called at all.\n\nWe do part of what normally would've been done by configfs_d_iput()\n(dropping the reference to configfs_dirent) manually, but we do\nnot clear ->s_dentry there. Sloppy as it is, it does not matter in\ncase of configfs_create_{dir,link}() - there configfs_dirent does\nnot survive dropping the sole reference to it.\n\nHowever, for configfs_lookup() it *does* survive, with a dangling\npointer to soon to be freed dentry sitting it its ->s_dentry.\n\nSubsequent getdents(2) in that directory will end up dereferencing\nthat pointer in order to pick the inode number. Use after free...\n\nThis is the minimal fix; the right approach is to set the linkage\nbetween dentry and configfs_dirent only after we know that we have\nan inode, but that takes more surgery and the bug had been there\nsince 2006, so..."
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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 bug is reached only via local VFS syscalls (openat/stat on a configfs attribute and getdents on its parent) against /sys/kernel/config; configfs is not exposed through network-facing kernel services such as ksmbd, nfsd, or the TCP/IP stack.\nAC:L - Exploitation is a deterministic error-path bug, not a race: inode allocation failure in configfs_lookup() leaves sd->s_dentry dangling and a follow-up getdents reliably dereferences it; the attacker can force ENOMEM by applying memory pressure they control.\nPR:L - Default configfs modes (0755 directories, 0644 attributes) let any local user read/list kernel-registered subsystem trees (e.g. nvmet, usb_gadget) without init-namespace root; mkdir/write still need admin, but triggering lookup on existing unpinned attributes does not.\nUI:N - No victim interaction is required beyond the attacker issuing their own syscalls on configfs paths; configfs is mounted at boot under /sys/kernel/config and exploitation does not depend on another user mounting or opening files.\nS:U - The use-after-free corrupts kernel heap memory and enables local privilege escalation within the same kernel security domain; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - configfs_readdir() reads d_inode() through a dangling sd->s_dentry after failed lookup, giving a slab use-after-free read primitive on freed dentry/inode memory that can disclose kernel data or pointers via heap reuse.\nI:H - Reclaimed dentry/inode slabs let an attacker shape freed-object contents and convert the dangling pointer into arbitrary kernel writes and control-flow hijack, consistent with standard UAF exploitation of VFS objects.\nA:H - Dereferencing the freed dentry during getdents causes kernel oops/panic (as described in the fix); the UAF is repeatable and can deny service even when full exploitation is not attempted."
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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/configfs/dir.c"
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],
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"versions": [
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{
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"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "3e83b2203aa59bd279e4f677ec793d49dc9d019e",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "b6e9c82522ddaa3ac0706b295ff4a71975d4f883",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "eee07d769da5ac4e4f7bd0bc17828646a318d499",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "9c747dcee164ead300de90550ad9e4122f0d1bbb",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "c3b073a209a9baa691b744318ac929fecdd8847c",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "57088b06109f3222963c639d8d743f42c2899b13",
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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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
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"lessThan": "10da12d352b7b2bb330a8609fdda9a58bf0e9856",
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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/configfs/dir.c"
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],
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"versions": [
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{
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"version": "2.6.16",
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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": "2.6.16",
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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": "5.15.212",
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"lessThanOrEqual": "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": "6.1.178",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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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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"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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.16",
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"versionEndExcluding": "5.15.212"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3e83b2203aa59bd279e4f677ec793d49dc9d019e"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6e9c82522ddaa3ac0706b295ff4a71975d4f883"
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{
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"url": "https://git.kernel.org/stable/c/eee07d769da5ac4e4f7bd0bc17828646a318d499"
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},
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{
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"url": "https://git.kernel.org/stable/c/9c747dcee164ead300de90550ad9e4122f0d1bbb"
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},
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{
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"url": "https://git.kernel.org/stable/c/c3b073a209a9baa691b744318ac929fecdd8847c"
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},
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{
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"url": "https://git.kernel.org/stable/c/57088b06109f3222963c639d8d743f42c2899b13"
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},
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{
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"url": "https://git.kernel.org/stable/c/10da12d352b7b2bb330a8609fdda9a58bf0e9856"
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}
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],
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"title": "configfs_lookup(): don't leave ->s_dentry dangling on failure",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74359",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:54:26.470078Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T18:55:35.328Z"
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}
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}
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]
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}
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} |