227 lines
12 KiB
JSON
227 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-2024-43840",
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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": "2024-08-17T09:11:59.274Z",
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"datePublished": "2024-08-17T09:21:55.841Z",
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"dateUpdated": "2026-08-05T11:36:42.708Z"
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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": "2026-08-05T11:36:42.708Z"
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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\nbpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG\n\nWhen BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls\n__bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them\nthe struct bpf_tramp_image *im pointer as an argument in R0.\n\nThe trampoline generation code uses emit_addr_mov_i64() to emit\ninstructions for moving the bpf_tramp_image address into R0, but\nemit_addr_mov_i64() assumes the address to be in the vmalloc() space\nand uses only 48 bits. Because bpf_tramp_image is allocated using\nkzalloc(), its address can use more than 48-bits, in this case the\ntrampoline will pass an invalid address to __bpf_tramp_enter/exit()\ncausing a kernel crash.\n\nFix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64()\nas it can work with addresses that are greater than 48-bits."
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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 vulnerable trampoline is generated through the local `bpf()` syscall (BPF_PROG_LOAD + link attach of an fexit/fmod_ret tracing program); there is no network-reachable path to the arm64 JIT.\nAC:L - On an affected system the miscompilation is deterministic — `emit_addr_mov_i64()` unconditionally clobbers bits 48-63 of the kzalloc'd `bpf_tramp_image` address, so every fexit/fmod_ret attach produces a broken trampoline that the attacker triggers simply by invoking the traced function. No race, timing window, or memory layout outside the attacker's influence is involved.\nPR:L - Loading and attaching a BPF_PROG_TYPE_TRACING program requires CAP_BPF plus CAP_PERFMON, which is a delegated non-root capability set commonly granted to unprivileged observability/container workloads and to userns-confined tasks via BPF tokens, not full administrative root.\nUI:N - The attacker loads the program, attaches it, and calls the traced kernel function entirely on its own; no victim action is needed.\nS:U - The wild pointer dereference and any resulting corruption occur within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `percpu_ref_get()` reads `ref->percpu_count_ptr` from a forged kernel address outside the intended object and treats the result as a live per-CPU pointer, and the broken image refcount can leave freed executable trampoline memory in use — memory corruption of this class is leverageable for kernel memory disclosure.\nI:H - After the wild read, `this_cpu_add(*percpu_count, 1)` (or `atomic_long_add(&ref->data->count)`) performs a read-modify-write through the garbage value, an uncontrolled kernel memory write; additionally the trampoline's liveness refcount is taken on the wrong object, permitting use-after-free of the JIT'd executable image.\nA:H - The forged address lands far outside mapped linear memory, so the first invocation of the traced function takes an unhandled kernel paging fault (oops/panic, possibly in atomic or softirq context), and the poisoned trampoline remains installed so every later call to that function faults again."
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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/net/bpf_jit_comp.c"
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],
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"versions": [
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{
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"version": "efc9909fdce00a827a37609628223cd45bf95d0b",
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"lessThan": "077149478497b2f00ff4fd9da2c892defa6418d8",
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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": "efc9909fdce00a827a37609628223cd45bf95d0b",
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"lessThan": "d9664e6ff040798a46cdc5d401064f55b8676c83",
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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": "efc9909fdce00a827a37609628223cd45bf95d0b",
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"lessThan": "6d218fcc707d6b2c3616b6cd24b948fd4825cfec",
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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": "efc9909fdce00a827a37609628223cd45bf95d0b",
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"lessThan": "19d3c179a37730caf600a97fed3794feac2b197b",
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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/arm64/net/bpf_jit_comp.c"
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],
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"versions": [
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{
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"version": "6.0",
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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": "6.0",
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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": "6.1.140",
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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": "6.6.92",
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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": "6.10.3",
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"lessThanOrEqual": "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": "6.11",
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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": "6.0",
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"versionEndExcluding": "6.1.140"
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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": "6.0",
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"versionEndExcluding": "6.6.92"
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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": "6.0",
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"versionEndExcluding": "6.10.3"
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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": "6.0",
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"versionEndExcluding": "6.11"
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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/077149478497b2f00ff4fd9da2c892defa6418d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/d9664e6ff040798a46cdc5d401064f55b8676c83"
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},
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{
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"url": "https://git.kernel.org/stable/c/6d218fcc707d6b2c3616b6cd24b948fd4825cfec"
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},
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{
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"url": "https://git.kernel.org/stable/c/19d3c179a37730caf600a97fed3794feac2b197b"
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}
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],
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"title": "bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG",
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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-2024-43840",
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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": "2024-09-10T16:07:58.806748Z"
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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": "2024-09-12T17:33:04.569Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:30:44.552Z"
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}
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}
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]
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}
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} |