300 lines
16 KiB
JSON
300 lines
16 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-2026-53076",
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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": "2026-06-09T07:44:35.383Z",
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"datePublished": "2026-06-24T16:30:17.092Z",
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"dateUpdated": "2026-10-30T12:26:36.563Z"
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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": "2026-10-30T12:26:36.563Z"
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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: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size that is not rounded up to 8 bytes.\n\nThe issue happens when:\n1. A CGROUP_STORAGE map is created with value_size not aligned to\n 8 bytes (e.g., 4 bytes)\n2. A pcpu map is created with the same value_size (e.g., 4 bytes)\n3. Update element in 2 with data in 1\n\npcpu_init_value assumes that all sources are rounded up to 8 bytes,\nand invokes copy_map_value_long to make a data copy, However, the\nassumption doesn't stand since there are some cases where the source\nmay not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data.\nthe verifier verifies exactly the size that the source claims, not\nthe size rounded up to 8 bytes by kernel, an OOB happens when the\nsource has only 4 bytes while the copy size(4) is rounded up to 8."
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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: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 vulnerable path is reached through local `bpf(2)` activity: creating BPF maps, loading a BPF program, and invoking `bpf_map_update_elem()` from that program. It is not directly reachable by remote packets without a local attacker-controlled BPF program already installed.\nAC:L - The trigger is deterministic: use a non-8-byte-aligned value size and pass a verifier-valid source buffer into a per-CPU hash update that previously copied the rounded-up size. No race or attacker-external timing condition is required.\nPR:L - A basic local user can reach the most severe reasonable case on systems where unprivileged BPF is enabled, including via socket-filter BPF and packet data sources; otherwise it requires BPF-related capabilities. Under the required higher-severity rule, this is PR:L rather than PR:H.\nUI:N - After the local attacker loads the BPF program and creates the maps, exploitation requires no victim action. The attacker triggers the helper path directly.\nS:U - The affected component and impacted resources are within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is an out-of-bounds kernel read whose extra bytes are copied into per-CPU map padding that can be returned through per-CPU map lookup paths. Even though each read is small, repeated attacker-controlled executions can disclose kernel memory, so the higher severity confidentiality value is warranted.\nI:N - The faulty copy writes only into the destination per-CPU map slot's allocated rounded padding, not past the allocated destination or into security-relevant map value bytes. I found no path turning this into attacker-controlled kernel data modification or control-flow corruption.\nA:H - The reported reproducer is a KASAN slab-out-of-bounds read in a deterministic BPF helper path, and such reachable kernel OOB reads can oops or panic on hardened/sanitized or unlucky layouts. Following the kernel scoring guidance and higher-severity rule, availability is H."
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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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"kernel/bpf/hashtab.c"
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],
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"versions": [
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{
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"version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
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"lessThan": "d138ea2fe01c254413d5a6104eb236e0d5c7dd9a",
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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": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
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"lessThan": "e19c5ed9f1922a6854073f8651a63fa7be26e9e9",
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"status": "affected",
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},
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{
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"version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
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"lessThan": "e0378419b0e20178b5d100b27c9cc7e51064202e",
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"status": "affected",
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"lessThan": "6086079e6d1c32ba4c4b422612b8aebb1129a96c",
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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": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db",
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"lessThan": "634a793d0e1c822412095d25a1338f8831ad894c",
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"status": "affected",
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"lessThan": "576afddfee8d1108ee299bf10f581593540d1a36",
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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": "c602ad2b52dcbca5af08e5137bd5575c039b52e3",
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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": "ab68b940dd6f7b5f8e2557937162dcb8a0583a05",
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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": "5.4.78",
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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": "5.9.9",
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"lessThan": "5.10",
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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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"kernel/bpf/hashtab.c"
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],
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"versions": [
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{
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"version": "5.10",
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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": "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": "6.1.191",
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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": "6.6.141",
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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": "6.12.91",
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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": "6.18.33",
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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": "7.0.10",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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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"operator": "OR",
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"versionStartIncluding": "5.10",
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"references": [
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"url": "https://git.kernel.org/stable/c/d138ea2fe01c254413d5a6104eb236e0d5c7dd9a"
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},
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{
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"url": "https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9"
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"url": "https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e"
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},
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"url": "https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c"
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{
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{
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"url": "https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36"
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}
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],
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"title": "bpf: Fix OOB in pcpu_init_value",
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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-2026-53076",
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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": "2026-10-16T15:25:17.354262Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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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": "2026-10-19T19:47:15.609Z"
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}
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}
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]
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}
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} |