326 lines
17 KiB
JSON
326 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-2026-89741",
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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": "2026-09-11T19:38:34.761Z",
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"datePublished": "2026-09-11T19:46:47.877Z",
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"dateUpdated": "2026-10-19T08:51:55.196Z"
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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": "2026-10-19T08:51:55.196Z"
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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\nRevert \"media: v4l2-dev: fix error handling in __video_register_device()\"\n\nThis reverts commit 2a934fdb01db6458288fc9386d3d8ceba6dd551a.\n\nThe intentions of that patch were good, but it doesn't work.\n\nThe idea is that if device_register fails, you have to do a put_device\nto let the ref counter release resources.\n\nHowever, the V4L2 API says that if video_register_device() fails, then\nyou have to call video_device_release(), which kfree()s the video_device\nstruct.\n\nBut the put_device() will already have freed the struct, so you end\nup in a double-free scenario.\n\nThere is not really a good way of fixing this without breaking\nvideo_register_device() into two parts, one that initializes everything,\nand one that does the actual device_register, and then converting all\nV4L2 drivers to this new model.\n\nThat is a massive job, and it is very unlikely that device_register\nwill fail.\n\nSo rather than ending up in a double-free scenario, just revert this\npatch, and in that case we'll have a small memory leak. Which is a lot\nmore robust."
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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 double-free is in __video_register_device(), reached from local V4L2 registration such as USB gadget UVC configfs UDC bind (uvc_function_bind → uvc_register_video) and usbfs/sysfs re-probe of USB cameras; dummy_hcd suffices and there is no remote packet path.\nAC:L - A local attacker can retry gadget bind or device re-probe under memory/resource pressure to make device_register() fail and take the put_device() error path; success does not depend on a victim-owned race or uninfluenced layout.\nPR:L - __video_register_device() and uvc_function_bind() perform no capable() check; Android/embedded HALs routinely delegate usb_gadget configfs to non-root, and desktop usbfs/video nodes are typically uaccess/video-group, so init-namespace root is not required.\nUI:N - The attacker performs the configfs UDC bind or local re-probe and applies resource pressure themselves; no separate victim mount, file-open, or cable-plug action is required.\nS:U - The heap double-free corrupts a kmalloc'd video_device or the parent object freed by vdev->release() inside the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - On device_register() failure the buggy put_device() runs v4l2_device_release() which calls vdev->release()/kfree, then callers such as video_device_release() or gspca/uvc probe error paths free the same object again, yielding a UAF disclosure primitive.\nI:H - The same double-free of struct video_device (or parent driver objects via vdev->release, as in UVC kref_put/uvc_delete and gspca_release) is heap corruption that can be sprayed into an arbitrary write and control-flow hijack.\nA:H - The double-free and premature v4l2_device_release() (including media_devnode_remove() on a still-NULL intf_devnode) oops or panic the kernel, and the attacker can repeat failed registration to force the crash."
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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/media/v4l2-core/v4l2-dev.c"
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],
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"versions": [
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{
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"version": "e5c8e62ae551e0ad2e15412aa0c57c2856d59677",
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"lessThan": "8b998c171ed875e402e1fd1c5cd619e4ca05e9c1",
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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": "8b451a9a46f2bfc510e6d5c2492df91647586184",
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"lessThan": "3de14b4f681a1b3c6d375d98d9d37a55ebb85349",
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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": "b6be1f5633eae200af2527e9eeb7f51be5739b0f",
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"lessThan": "8027f82c0f5474ed72448e160ee9778051fa1f49",
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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": "ae7b143e05b36fc69d6571751855946cc45064c6",
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"lessThan": "2ac009a65d2385e9f0799eaf9d9694a29153a161",
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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": "2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7",
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"lessThan": "712ca1cf756de2557a116e0df55791bac0c9f99e",
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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": "2a934fdb01db6458288fc9386d3d8ceba6dd551a",
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"lessThan": "aad08b5f67d2a8116e1a00bce2611c1513b10bce",
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"status": "affected",
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},
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{
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"version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a",
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"lessThan": "ce792b94e03882108019ba996c1a7c4d4e09be2c",
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"status": "affected",
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{
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"lessThan": "e7600f5cee5de14065f950807931d6e6d40fb2d7",
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"status": "affected",
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},
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{
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"version": "ee141706e701356dda41c6fed9ee18bf427c28e3",
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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": "4451412739ed33a49b34624299394ee575116d0c",
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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": "5.10.239",
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"lessThan": "5.10.270",
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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": "5.15.186",
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"lessThan": "5.15.221",
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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": "6.1.142",
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"lessThan": "6.1.188",
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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": "6.6.95",
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"lessThan": "6.6.157",
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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": "6.12.35",
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"lessThan": "6.12.109",
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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": "5.4.295",
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"lessThan": "5.5",
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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": "6.15.4",
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"lessThan": "6.16",
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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/media/v4l2-core/v4l2-dev.c"
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],
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"versions": [
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{
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"version": "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": "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": "5.10.270",
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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": "5.15.221",
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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": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.109",
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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": "6.18.50",
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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": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"cpeApplicability": [
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"url": "https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349"
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},
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"url": "https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e"
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},
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{
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"url": "https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce"
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},
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{
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"url": "https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c"
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},
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{
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"url": "https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7"
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}
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],
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"title": "Revert \"media: v4l2-dev: fix error handling in __video_register_device()\"",
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