256 lines
15 KiB
JSON
256 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-2022-49014",
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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": "2024-08-22T01:27:53.645Z",
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"datePublished": "2024-10-21T20:06:24.020Z",
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"dateUpdated": "2026-08-05T08:53:25.973Z"
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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": "2026-08-05T08:53:25.973Z"
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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\nnet: tun: Fix use-after-free in tun_detach()\n\nsyzbot reported use-after-free in tun_detach() [1]. This causes call\ntrace like below:\n\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\n\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x15e/0x461 mm/kasan/report.c:395\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\n tun_detach drivers/net/tun.c:704 [inline]\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n __fput+0x27c/0xa90 fs/file_table.c:320\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\n\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."
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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 by opening /dev/net/tun, attaching via TUNSETIFF, then closing the fd (tun_chr_close → tun_detach); this is a local char-dev/ioctl path, not remote packet processing.\nAC:L - An attacker who creates a dedicated netns, attaches a non-persistent TUN, and exits deterministically drops the last struct net ref via sock_put while netdev_run_todo sleeps in netdev_wait_allrefs, so cleanup_net frees the net before notifier_call_chain runs; syzbot hit this repeatedly with no attacker-uncontrollable condition.\nPR:L - Creating a TUN device requires only ns_capable(net->user_ns, CAP_NET_ADMIN), which an unprivileged user obtains via user+net namespaces (unshare -Urn); /dev/net/tun is world-accessible and syzbot reproduced via unshare/copy_net_ns.\nUI:N - The attacker opens the TUN device, configures it, and exits entirely on their own; no victim action is required.\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same kernel security authority, with no VM escape or IOMMU/sandbox boundary crossing.\nC:H - The UAF frees a ~6.7KB struct net slab object that is later read in notifier_call_chain via net->netdev_chain; reclaiming that object enables arbitrary kernel memory disclosure.\nI:H - Reclaiming the freed net_namespace object lets an attacker control the notifier chain walked by notifier_call_chain, yielding function-pointer hijack and arbitrary write/code-execution primitives.\nA:H - Any use-after-free is scored A:H; accessing the freed struct net during netdev unregister notifiers can oops/panic the kernel even without a full exploit."
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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/net/tun.c"
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],
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"versions": [
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{
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"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326",
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"lessThan": "1f23f1890d91812c35d32eab1b49621b6d32dc7b",
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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": "83c1f36f9880814b24cdf6c2f91f66f61db65326",
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"lessThan": "16c244bc65d1175775325ec0489a5a5c830e02c7",
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"status": "affected",
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"lessThan": "5f442e1d403e0496bacb74a58e2be7f500695e6f",
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"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326",
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"lessThan": "04b995e963229501401810dab89dc73e7f12d054",
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"status": "affected",
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"versionType": "git"
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{
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"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326",
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"lessThan": "4cde8da2d814a3b7b176db81922d4ddaad7c0f0e",
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"status": "affected",
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"status": "affected",
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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/net/tun.c"
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],
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"versions": [
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{
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"version": "4.17",
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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": "4.17",
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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": "4.19.268",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.226",
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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": "5.10.158",
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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": "5.15.82",
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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": "6.0.12",
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"lessThanOrEqual": "6.0.*",
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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",
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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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"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/1f23f1890d91812c35d32eab1b49621b6d32dc7b"
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},
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{
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"url": "https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7"
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},
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{
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"url": "https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f"
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},
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{
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"url": "https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054"
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},
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{
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"url": "https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e"
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},
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{
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"url": "https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12"
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}
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],
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"title": "net: tun: Fix use-after-free in tun_detach()",
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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-2022-49014",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-22T13:13:28.883740Z"
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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": "2024-10-22T13:18:38.243Z"
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}
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}
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]
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}
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} |