344 lines
17 KiB
JSON
344 lines
17 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-2026-43327",
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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": "2026-05-01T14:12:56.002Z",
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"datePublished": "2026-05-08T13:31:12.896Z",
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"dateUpdated": "2026-05-23T16:06:42.428Z"
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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": "2026-05-23T16:06:42.428Z"
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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: dummy-hcd: Fix locking/synchronization error\n\nSyzbot testing was able to provoke an addressing exception and crash\nin the usb_gadget_udc_reset() routine in\ndrivers/usb/gadgets/udc/core.c, resulting from the fact that the\nroutine was called with a second (\"driver\") argument of NULL. The bad\ncaller was set_link_state() in dummy_hcd.c, and the problem arose\nbecause of a race between a USB reset and driver unbind.\n\nThese sorts of races were not supposed to be possible; commit\n7dbd8f4cabd9 (\"USB: dummy-hcd: Fix erroneous synchronization change\"),\nalong with a few followup commits, was written specifically to prevent\nthem. As it turns out, there are (at least) two errors remaining in\nthe code. Another patch will address the second error; this one is\nconcerned with the first.\n\nThe error responsible for the syzbot crash occurred because the\nstop_activity() routine will sometimes drop and then re-acquire the\ndum->lock spinlock. A call to stop_activity() occurs in\nset_link_state() when handling an emulated USB reset, after the test\nof dum->ints_enabled and before the increment of dum->callback_usage.\nThis allowed another thread (doing a driver unbind) to sneak in and\ngrab the spinlock, and then clear dum->ints_enabled and dum->driver.\nNormally this other thread would have to wait for dum->callback_usage\nto go down to 0 before it would clear dum->driver, but in this case it\ndidn't have to wait since dum->callback_usage had not yet been\nincremented.\n\nThe fix is to increment dum->callback_usage _before_ calling\nstop_activity() instead of after. Then the thread doing the unbind\nwill not clear dum->driver until after the call to\nusb_gadget_udc_reset() safely returns and dum->callback_usage has been\ndecremented again."
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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/udc/dummy_hcd.c"
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],
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"versions": [
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{
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"version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "6350c7dd33ab481ef41c931a238361490c32d15c",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "cc97fb5969177cccce2e23b31298df220fc7570d",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "218886b2ef2dea7627d3700ab0abaf4bf9d1161f",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "791966f85b439b261bf19865cf1c07c065ffb4b4",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "805b1833d6ed6da5086e610578a28e71bb54fbbb",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "efbd9441f1e769a7aae1813d497cec09cbdff031",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "69ab97a693251d6a6093e630060a3c744fd58524",
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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": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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"lessThan": "616a63ff495df12863692ab3f9f7b84e3fa7a66d",
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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": "7b416b9dac6ede26d4ca0c1a88b448b543623ff3",
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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": "8590bc1da625dd4a589eac0fc3aa3cf4f400424d",
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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": "a867d5b932ac4911d3f8a1e63505061b0c81f889",
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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": "e84b4a008365b7edbd842a063ae28d040a98db25",
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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": "e39b17143a5b5aac81f066d455e5d3a9877eb3ae",
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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": "4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715",
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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": "3.2.97",
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"lessThan": "3.3",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "3.16.52",
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"lessThan": "3.17",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.1.46",
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"lessThan": "4.2",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.4.92",
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"lessThan": "4.5",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.9.55",
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"lessThan": "4.10",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.13.6",
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"lessThan": "4.14",
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"status": "affected",
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"versionType": "semver"
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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/udc/dummy_hcd.c"
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],
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"versions": [
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{
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"version": "4.14",
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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": "4.14",
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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": "5.10.253",
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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": "5.15.203",
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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": "6.1.168",
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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": "6.6.134",
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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": "6.12.81",
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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": "6.18.22",
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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": "6.19.12",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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": "4.14",
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"versionEndExcluding": "5.10.253"
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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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"versionEndExcluding": "5.15.203"
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},
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},
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},
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},
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},
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"vulnerable": true,
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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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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6350c7dd33ab481ef41c931a238361490c32d15c"
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},
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{
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"url": "https://git.kernel.org/stable/c/cc97fb5969177cccce2e23b31298df220fc7570d"
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},
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{
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"url": "https://git.kernel.org/stable/c/218886b2ef2dea7627d3700ab0abaf4bf9d1161f"
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},
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{
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"url": "https://git.kernel.org/stable/c/791966f85b439b261bf19865cf1c07c065ffb4b4"
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},
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{
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"url": "https://git.kernel.org/stable/c/805b1833d6ed6da5086e610578a28e71bb54fbbb"
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},
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{
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"url": "https://git.kernel.org/stable/c/efbd9441f1e769a7aae1813d497cec09cbdff031"
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},
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{
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"url": "https://git.kernel.org/stable/c/69ab97a693251d6a6093e630060a3c744fd58524"
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},
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{
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"url": "https://git.kernel.org/stable/c/616a63ff495df12863692ab3f9f7b84e3fa7a66d"
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}
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],
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"title": "USB: dummy-hcd: Fix locking/synchronization error",
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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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} |