245 lines
13 KiB
JSON
245 lines
13 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-2026-97508",
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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": "2026-09-24T16:01:01.151Z",
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"datePublished": "2026-09-24T16:04:58.740Z",
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"dateUpdated": "2026-10-03T10:59:06.059Z"
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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": "2026-10-03T10:59:06.059Z"
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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\nthunderbolt: Set tb->root_switch to NULL when domain is stopped\n\nSimilarly what we do with the firmware connection manager. This makes\ntb_xdp_handle_request() return error to the remote host. However, we\nneed to make sure we keep the uuid alive so that we can reply until the\nwhole domain is released."
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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:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.5,
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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:A - XDomain discovery packets (TB_CFG_PKG_XDOMAIN_REQ) from a connected Thunderbolt/USB4 peer enter via tb_ctl_rx_callback → tb_domain_event_cb → tb_xdomain_handle_request → tb_xdp_schedule_request and are handled in tb_xdp_handle_request, which then reads tb->root_switch after software-CM tb_stop(). This is a local Thunderbolt fabric, not a routable IP protocol.\nAC:H - The UAF requires software-CM tb_stop() to have already run tb_switch_remove(tb->root_switch) without clearing the pointer. tb_stop() is only called from tb_domain_remove() in nhi_pci_remove (NHI unbind/PCI removal), which a Thunderbolt peer cannot induce; UUID_REQUEST and other XDomain messages only queue system_wq work that then races that teardown.\nPR:N - tb_domain_event_cb dispatches TB_CFG_PKG_XDOMAIN_REQ to tb_xdomain_handle_request whenever tb_is_xdomain_enabled() (default-on xdomain module param plus ACPI OSC), with no device authorization or local credentials; UUID_REQUEST is answered even when tb_xdomain_find_by_route_locked() finds no xdomain.\nUI:N - Once a Thunderbolt/USB4 link exists, the peer injects XDomain control packets itself and tb_xdp_handle_request runs with no mount, sysfs write, or authorization dialog. Domain teardown is an attacker-independent condition and is scored as AC:H rather than a required victim UI step.\nS:U - The dangling tb->root_switch and sw->uuid accesses corrupt host kernel heap state inside the Thunderbolt driver; this does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After tb_stop() frees the host switch, tb_xdp_handle_request still holds tb->root_switch->uuid and tb_xdp_uuid_response() uuid_copy()s those 16 bytes into a UUID_RESPONSE sent back to the peer; UAF of struct tb_switch is also a kernel disclosure primitive.\nI:H - tb_xdomain_find_by_route() calls switch_find_xdomain(tb->root_switch) which walks the freed host switch via tb_switch_for_each_port, and later request handlers may operate on a reallocated tb_xdomain; that slab UAF can be sprayed into an arbitrary write or control-flow hijack.\nA:H - Dereferencing the freed root switch in tb_xdp_handle_request (uuid load) or switch_find_xdomain (port walk) oopses the system_wq kworker, crashing the host."
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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/thunderbolt/tb.c",
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"drivers/thunderbolt/xdomain.c"
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],
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"versions": [
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{
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"version": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "d9a638e7bc87e0e6fe3a75517ac481e72fc0058c",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "66b0fe27e277713c2b9f3c452c76330ed0bd7eaf",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "54ad3415cc211ca0d64ae1bf3234d6eb5c6aedd0",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "83d1af5b1b6e6c96ffa633ca2c9a77f6f4c93efa",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "f06e9fbae78a51832211b4495a19412c7d49ecb4",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "99f019d2e9eb79adc485fef8aa8ada2cd0c843e9",
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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": "d1ff70241a275133e1a0258b7c23588b122276c8",
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"lessThan": "e56249d8a68e712f3b60e1f3fdbb5b4fea146468",
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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/thunderbolt/tb.c",
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"drivers/thunderbolt/xdomain.c"
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],
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"versions": [
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{
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"version": "4.15",
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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": "4.15",
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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": "5.10.271",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.111",
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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": "6.18.53",
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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": "7.2",
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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": "4.15",
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"versionEndExcluding": "5.10.271"
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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": "4.15",
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"versionEndExcluding": "5.15.222"
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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": "4.15",
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"versionEndExcluding": "6.1.189"
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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": "4.15",
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"versionEndExcluding": "6.6.158"
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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": "4.15",
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"versionEndExcluding": "6.12.111"
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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": "4.15",
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"versionEndExcluding": "6.18.53"
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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": "4.15",
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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/d9a638e7bc87e0e6fe3a75517ac481e72fc0058c"
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},
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{
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"url": "https://git.kernel.org/stable/c/66b0fe27e277713c2b9f3c452c76330ed0bd7eaf"
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},
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{
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"url": "https://git.kernel.org/stable/c/54ad3415cc211ca0d64ae1bf3234d6eb5c6aedd0"
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},
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{
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"url": "https://git.kernel.org/stable/c/83d1af5b1b6e6c96ffa633ca2c9a77f6f4c93efa"
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},
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{
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"url": "https://git.kernel.org/stable/c/f06e9fbae78a51832211b4495a19412c7d49ecb4"
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},
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{
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"url": "https://git.kernel.org/stable/c/99f019d2e9eb79adc485fef8aa8ada2cd0c843e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/e56249d8a68e712f3b60e1f3fdbb5b4fea146468"
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}
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],
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"title": "thunderbolt: Set tb->root_switch to NULL when domain is stopped",
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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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}
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} |