263 lines
14 KiB
JSON
263 lines
14 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-2026-72427",
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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": "2026-08-09T03:40:39.928Z",
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"datePublished": "2026-08-15T05:56:44.197Z",
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"dateUpdated": "2026-10-16T18:55:23.555Z"
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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": "2026-08-17T05:44:07.623Z"
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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 effective prog array index with BPF_F_PREORDER\n\nreplace_effective_prog() and purge_effective_progs() located the slot in\nthe effective array by walking the program hlist and counting entries\nlinearly. That count does not match the array layout: compute_effective_\nprogs() places BPF_F_PREORDER programs at the front (ancestor cgroup\nfirst, attach order within a cgroup) and the rest after them (descendant\ncgroup first). So when a preorder program is present, the linear hlist\nposition no longer equals the program's index in the effective array.\n\nFor replace_effective_prog() (bpf_link_update()) this overwrote the\nwrong slot, corrupting the effective order. For purge_effective_progs(),\nit could dummy out a slot belonging to a different program and leave the\ndetached program in the array while bpf_prog_put() drops its reference,\ni.e. a use-after-free.\n\nFix both by replaying compute_effective_progs()'s placement (including\nthe per-cgroup preorder reversal) in a shared effective_prog_pos()\nhelper. Identify the entry by its struct bpf_prog_list pointer rather\nthan by (prog, link) value, so the lookup resolves to exactly the\nattachment the syscall selected even when the same bpf_prog is attached\nto several cgroups in the hierarchy."
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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 - Exploitation requires local bpf() syscalls (BPF_LINK_CREATE/BPF_PROG_ATTACH with BPF_F_PREORDER, BPF_LINK_UPDATE, BPF_PROG_DETACH/BPF_LINK_DETACH) through __cgroup_bpf_replace/__cgroup_bpf_detach in kernel/bpf/cgroup.c; per kernel CNA guidance BPF cgroup hooks are Local even when later triggered by packets.\nAC:L - Attacker fully controls cgroup hierarchy, BPF_F_PREORDER|BPF_F_ALLOW_MULTI attachments, and bpf_link_update/detach timing; purge_effective_progs UAF needs update_effective_progs() OOM which attacker can induce via memory pressure/large hierarchies, and bpf_link_update ordering corruption triggers without OOM.\nPR:L - Reaching the bug requires CAP_BPF (and CAP_NET_ADMIN for most cgroup BPF types) plus cgroup v2 attach access, commonly obtainable by unprivileged users via delegated cgroups or user namespaces (CAP_BPF/CAP_NET_ADMIN), not init-namespace root.\nUI:N - Attacker loads, attaches, and updates/detaches their own cgroup BPF programs and links via bpf(); no separate victim or administrator action is required.\nS:U - The bug corrupts kernel cgroup BPF effective-prog arrays causing UAF/ordering corruption within the same kernel security domain, enabling local privilege escalation rather than crossing VM, IOMMU, or sandbox boundaries.\nC:H - purge_effective_progs() can leave a detached bpf_prog pointer in the RCU-protected effective array while bpf_prog_put() frees it, yielding a use-after-free read when __cgroup_bpf_run_filter_* later executes the stale program under RCU.\nI:H - UAF of bpf_prog objects enables heap reuse for arbitrary kernel writes/control-flow hijack; bpf_link_update() mis-indexing can overwrite another attachment's effective slot so attacker-controlled BPF runs in place of security/filter programs on traffic for the whole cgroup tree.\nA:H - Freed-but-still-referenced programs are executed from softirq/network cgroup hooks and reliably cause kernel oops/panic/KASAN failures; ordering corruption can also crash or hang filtering paths serving container/cloud workloads."
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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/cgroup.c"
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],
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"versions": [
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{
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"version": "bc8023ef3b11410682e5d4990e05e5bc2d3e1c94",
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"lessThan": "525e408c27ae714e538b8c608c3a974df3ab6c92",
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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": "555c0b713ca83968d3c843cb15485b9ba3367b1b",
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"lessThan": "41b4320b84fdafe1ab586b06453d30d50415db59",
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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": "4b82b181a26cff8bf7adc3a85a88d121d92edeaf",
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"lessThan": "9697db03e010391c55ae75192cbdf30c5a72c114",
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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": "4b82b181a26cff8bf7adc3a85a88d121d92edeaf",
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"lessThan": "b584f107ab90222bd825dcb4c5977326ff684109",
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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": "4b82b181a26cff8bf7adc3a85a88d121d92edeaf",
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"lessThan": "f08aaee3152d0dfc578b3f2586932d82062701dd",
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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": "4707ad649cf662add3058bff47430817811b048d",
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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": "6.6.93",
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"lessThan": "6.6.145",
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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": "6.12.31",
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"lessThan": "6.12.97",
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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": "6.14.9",
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"lessThan": "6.15",
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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/cgroup.c"
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],
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"versions": [
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{
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"version": "6.15",
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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": "6.15",
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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": "6.6.145",
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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": "6.12.97",
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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": "6.18.40",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"versionStartIncluding": "6.6.93",
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"versionEndExcluding": "6.6.145"
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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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]
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/525e408c27ae714e538b8c608c3a974df3ab6c92"
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},
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{
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"url": "https://git.kernel.org/stable/c/41b4320b84fdafe1ab586b06453d30d50415db59"
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},
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{
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"url": "https://git.kernel.org/stable/c/9697db03e010391c55ae75192cbdf30c5a72c114"
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},
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{
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"url": "https://git.kernel.org/stable/c/b584f107ab90222bd825dcb4c5977326ff684109"
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},
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{
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"url": "https://git.kernel.org/stable/c/f08aaee3152d0dfc578b3f2586932d82062701dd"
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}
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],
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"title": "bpf: Fix effective prog array index with BPF_F_PREORDER",
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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-2026-72427",
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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": "2026-10-16T18:49:46.514218Z"
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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": "2026-10-16T18:55:23.555Z"
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}
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}
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]
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}
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} |