225 lines
12 KiB
JSON
225 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-2025-38169",
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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": "2025-04-16T04:51:23.991Z",
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"datePublished": "2025-07-03T08:36:08.393Z",
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"dateUpdated": "2026-10-15T21:52:10.436Z"
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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": "2026-08-05T12:00:02.043Z"
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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\narm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP\n\nOn system with SME, a thread's kernel FPSIMD state may be erroneously\nclobbered during a context switch immediately after that state is\nrestored. Systems without SME are unaffected.\n\nIf the CPU happens to be in streaming SVE mode before a context switch\nto a thread with kernel FPSIMD state, fpsimd_thread_switch() will\nrestore the kernel FPSIMD state using fpsimd_load_kernel_state() while\nthe CPU is still in streaming SVE mode. When fpsimd_thread_switch()\nsubsequently calls fpsimd_flush_cpu_state(), this will execute an\nSMSTOP, causing an exit from streaming SVE mode. The exit from\nstreaming SVE mode will cause the hardware to reset a number of\nFPSIMD/SVE/SME registers, clobbering the FPSIMD state.\n\nFix this by calling fpsimd_flush_cpu_state() before restoring the kernel\nFPSIMD state."
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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 - Triggering requires executing SMSTART/streaming-SVE instructions at EL0 on the affected CPU and generating local scheduler pressure, so the attacker must be able to run code on the target. A remote peer cannot place the CPU into streaming SVE mode.\nAC:L - The attacker controls both sides of the race — they create the streaming-mode task and the kernel-mode NEON workload (AF_ALG, dm-crypt/fscrypt I/O, kTLS), and can pin both to one CPU via sched_setaffinity so ordinary tick preemption reproduces the clobber on demand. No memory layout or victim state outside the attacker's influence is needed, and CONFIG_ARM64_SME is default y.\nPR:L - do_sme_acc() enables SME and streaming mode for any EL0 task with no capability, namespace, or sysctl gate, and driving kernel-mode NEON via AF_ALG or plain I/O on an encrypted/checksummed filesystem needs no privilege. Only unprivileged local code execution is required.\nUI:N - The attacker's own tasks supply both the streaming-mode context and the preempted kernel NEON section; no victim action is needed, and any concurrent crypto/RAID work on the system is silently corrupted.\nS:U - The corruption is confined to kernel FPSIMD register state managed by the same kernel security authority; KVM already flushes and SMSTOPs guest FP state in kvm_arch_vcpu_put_fp(), so no guest/host or IOMMU boundary is crossed.\nC:H - Zeroing V0-V31 mid-operation destroys the in-register AES round-key schedule and IV (aes-ce.S load_round_keys/cbciv) or the ChaCha20 state, so the affected blocks are emitted under a known all-zero key — a fixed, invertible transform. An attacker who observes the resulting dm-crypt/fscrypt blocks or IPsec/kTLS/WireGuard packets recovers the plaintext that encryption was supposed to protect.\nI:H - Kernel crypto, hash, CRC and RAID6 computations silently return wrong results that are written to disk and the wire, corrupting encrypted volumes, RAID parity, filesystem checksums and dm-verity/dm-integrity data. A zeroed GHASH key also yields predictable authentication tags, enabling forgery against integrity-protected data.\nA:H - The silent miscomputation propagates into dm-verity/dm-integrity/filesystem checksum verification failures, producing I/O errors, forced read-only remounts, errors=panic aborts and Android restart-on-corruption reboots, plus unrecoverable RAID6 parity loss. The attacker can trigger it repeatedly and indefinitely."
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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/arm64/kernel/fpsimd.c"
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],
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"versions": [
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{
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"version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
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"lessThan": "55d52af498daea75aa03ba9b7e444c8ae495ac20",
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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": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
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"lessThan": "a305821f597ec943849d3e53924adb88c61ed682",
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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": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
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"lessThan": "01098d893fa8a6edb2b56e178b798e3e6b674f02",
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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": "e003c485ac82a9f8de4204912ed059ac6dd4257c",
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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": "25b90cd122d546823da90b916f7c3289dfe83a99",
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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": "6.8.12",
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"lessThan": "6.9",
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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": "6.9.3",
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"lessThan": "6.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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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/arm64/kernel/fpsimd.c"
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],
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"versions": [
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{
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"version": "6.10",
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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": "6.10",
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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": "6.12.34",
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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": "6.15.3",
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"lessThanOrEqual": "6.15.*",
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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": "6.16",
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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": "6.10",
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"versionEndExcluding": "6.12.34"
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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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{
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"vulnerable": true,
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"versionStartIncluding": "6.9.3"
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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/55d52af498daea75aa03ba9b7e444c8ae495ac20"
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},
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{
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"url": "https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682"
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},
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{
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"url": "https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02"
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}
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],
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"title": "arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2025-38169",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:48:10.598358Z"
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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": "2026-10-15T21:52:10.436Z"
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}
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}
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]
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} |