305 lines
16 KiB
JSON
305 lines
16 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-2022-49755",
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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": "2025-03-27T16:39:17.988Z",
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"datePublished": "2025-03-27T16:43:02.950Z",
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"dateUpdated": "2026-08-05T08:56:13.355Z"
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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": "2026-08-05T08:56:13.355Z"
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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\nusb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait\n\nWhile performing fast composition switch, there is a possibility that the\nprocess of ffs_ep0_write/ffs_ep0_read get into a race condition\ndue to ep0req being freed up from functionfs_unbind.\n\nConsider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait\nby taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't\nbounded so it can go ahead and mark the ep0req to NULL, and since there\nis no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.\n\nFix this by making a serialized execution between the two functions using\na mutex_lock(ffs->mutex)."
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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 race is between local FunctionFS ep0 read/write syscalls and functionfs_unbind during composition switch/gadget teardown, not USB host packet parsing. This matches prior f_fs userspace-API UAF scoring (e.g. CVE-2024-36894, CVE-2025-71074) as Local rather than Physical.\nAC:L - The attacker drives both sides—ep0 I/O into __ffs_ep0_queue_wait and unbind via composition switch or FunctionFS close/unregister—and can retry the race freely. Per guidance, a race the attacker fully creates is AC:L.\nPR:L - FunctionFS mounts commonly use uid=/gid=/fmode= to delegate ep0 to unprivileged gadget daemons (adbd/shell on Android, embedded USB services). Once mounted by init, those accounts can open ep0 and participate in the race without init-namespace root.\nUI:N - The attacker performs ep0 operations and triggers unbind/composition teardown directly; no separate victim action is required beyond an already-deployed FunctionFS gadget.\nS:U - The use-after-free corrupts kernel heap within the same host kernel security authority. This is ordinary local privilege escalation, not a VM escape or IOMMU/sandbox boundary cross.\nC:H - functionfs_unbind frees the live usb_request (ep0req) while __ffs_ep0_queue_wait still uses it; reclaim of that heap object enables attacker-controlled contents and kernel memory disclosure via subsequent field/pointer use.\nI:H - The freed usb_request is written (buf/length/zero) and passed to usb_ep_queue/usb_ep_dequeue, so a reclaimed object yields arbitrary write and control-flow hijack primitives. Kernel UAFs are scored High for integrity.\nA:H - Dereferencing or queuing the freed ep0req (or the concurrently NULLed gadget pointer) causes kernel oops/panic; any such crash is High availability impact."
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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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"drivers/usb/gadget/function/f_fs.c"
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],
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"versions": [
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{
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"version": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "facf353c9e8d7885b686d9a4b173d4e0af6441d2",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "a8d40942df074f4ebcb9bd3413596d92f323b064",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "6dd9ea05534f323668db94fcc2726c7a84547e78",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "ae8e136bcaae96163b5821984de1036efc9abb1a",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "6aee197b7fbcd61596a78b47d553f2f99111f217",
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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": "ddf8abd2599491cbad959c700b90ba72a5dce8d0",
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"lessThan": "6a19da111057f69214b97c62fb0ac59023970850",
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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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"drivers/usb/gadget/function/f_fs.c"
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],
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"versions": [
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{
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"version": "2.6.35",
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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": "2.6.35",
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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": "4.14.305",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.272",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.231",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.166",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.91",
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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": "6.1.9",
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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": "6.2",
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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": "2.6.35",
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"versionEndExcluding": "4.14.305"
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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": "2.6.35",
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"versionEndExcluding": "4.19.272"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.35",
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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/facf353c9e8d7885b686d9a4b173d4e0af6441d2"
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},
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{
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"url": "https://git.kernel.org/stable/c/e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4"
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},
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{
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"url": "https://git.kernel.org/stable/c/a8d40942df074f4ebcb9bd3413596d92f323b064"
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},
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{
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"url": "https://git.kernel.org/stable/c/6dd9ea05534f323668db94fcc2726c7a84547e78"
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},
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{
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"url": "https://git.kernel.org/stable/c/ae8e136bcaae96163b5821984de1036efc9abb1a"
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},
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{
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"url": "https://git.kernel.org/stable/c/6aee197b7fbcd61596a78b47d553f2f99111f217"
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},
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{
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"url": "https://git.kernel.org/stable/c/6a19da111057f69214b97c62fb0ac59023970850"
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}
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],
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"title": "usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait",
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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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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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2022-49755",
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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": "2025-03-28T15:22:31.876200Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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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": "2025-03-28T15:31:59.379Z"
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}
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}
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]
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}
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} |