214 lines
12 KiB
JSON
214 lines
12 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-2022-48943",
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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": "2024-08-22T01:27:53.623Z",
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"datePublished": "2024-08-22T03:30:14.027Z",
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"dateUpdated": "2026-08-05T08:53:03.401Z"
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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": "2026-08-05T08:53:03.401Z"
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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\nKVM: x86/mmu: make apf token non-zero to fix bug\n\nIn current async pagefault logic, when a page is ready, KVM relies on\nkvm_arch_can_dequeue_async_page_present() to determine whether to deliver\na READY event to the Guest. This function test token value of struct\nkvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a\nREADY event is finished by Guest. If value is zero meaning that a READY\nevent is done, so the KVM can deliver another.\nBut the kvm_arch_setup_async_pf() may produce a valid token with zero\nvalue, which is confused with previous mention and may lead the loss of\nthis READY event.\n\nThis bug may cause task blocked forever in Guest:\n INFO: task stress:7532 blocked for more than 1254 seconds.\n Not tainted 5.10.0 #16\n \"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n task:stress state:D stack: 0 pid: 7532 ppid: 1409\n flags:0x00000080\n Call Trace:\n __schedule+0x1e7/0x650\n schedule+0x46/0xb0\n kvm_async_pf_task_wait_schedule+0xad/0xe0\n ? exit_to_user_mode_prepare+0x60/0x70\n __kvm_handle_async_pf+0x4f/0xb0\n ? asm_exc_page_fault+0x8/0x30\n exc_page_fault+0x6f/0x110\n ? asm_exc_page_fault+0x8/0x30\n asm_exc_page_fault+0x1e/0x30\n RIP: 0033:0x402d00\n RSP: 002b:00007ffd31912500 EFLAGS: 00010206\n RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0\n RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0\n RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086\n R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000\n R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000"
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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:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.1,
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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 only when a KVM guest takes a paravirtual async page fault (KVM_RUN → faultin → kvm_arch_setup_async_pf), which requires local code execution inside a VM or local /dev/kvm use—not remote packet processing.\nAC:L - On overcommitted KVM hosts (common cloud deployments) async PF is routinely exercised; token 0 is produced deterministically on vCPU 0 when (id<<12)==0, and concurrent READY completions that drop that event are driven by attacker/workload-controlled multi-threaded memory stress, as in the original hang report.\nPR:N - No host privileges are required—an ordinary tenant VM triggers this via normal guest userspace page faults after the guest kernel enables MSR_KVM_ASYNC_PF_EN, matching other guest-triggerable KVM DoS scores (PR:N relative to the host).\nUI:N - No separate victim action is needed; guest memory accesses under host reclaim/async PF delivery alone hit the vulnerable token path.\nS:C - The vulnerable code is host KVM MMU/async-PF handling, but the impact is permanent denial of guest task/VM progress across the hypervisor–guest (and nested L1/L2) security boundary, consistent with other host-KVM guest-availability DoS scorings.\nC:N - This is solely a confused zero token versus the READY-slot-empty sentinel causing a lost wakeup; there is no OOB read, UAF, or other disclosure primitive.\nI:N - No memory corruption, write primitive, or control-flow hijack occurs—only failure to deliver a READY notification for a valid token value of zero.\nA:H - A lost READY leaves the guest task blocked forever in TASK_UNINTERRUPTIBLE (D state), which is a complete denial of that workload’s availability and can stall nested guests depending on the hung threads."
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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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"arch/x86/kvm/mmu/mmu.c"
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],
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"versions": [
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{
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"version": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
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"lessThan": "72fdfc75d4217b32363cc80def3de2cb3fef3f02",
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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": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
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"lessThan": "4c3644b6c96c5daa5149e5abddc07234eea47c7c",
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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": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
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"lessThan": "62040f5cd7d937de547836e747b6aa8212fec573",
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"status": "affected",
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"lessThan": "6f3c1fc53d86d580d8d6d749c4af23705e4f6f79",
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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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"arch/x86/kvm/mmu/mmu.c"
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],
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"versions": [
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{
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"version": "5.8",
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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": "5.8",
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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": "5.10.103",
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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": "5.15.26",
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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": "5.16.12",
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"lessThanOrEqual": "5.16.*",
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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": "5.17",
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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": "5.8",
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"versionEndExcluding": "5.10.103"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "5.16.12"
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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": "5.8",
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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/72fdfc75d4217b32363cc80def3de2cb3fef3f02"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c3644b6c96c5daa5149e5abddc07234eea47c7c"
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},
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{
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"url": "https://git.kernel.org/stable/c/62040f5cd7d937de547836e747b6aa8212fec573"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f3c1fc53d86d580d8d6d749c4af23705e4f6f79"
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}
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],
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"title": "KVM: x86/mmu: make apf token non-zero to fix bug",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2022-48943",
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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": "2024-09-10T15:33:08.943998Z"
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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": "2024-09-12T17:33:10.679Z"
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}
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}
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]
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}
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} |