316 lines
17 KiB
JSON
316 lines
17 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-2025-38424",
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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": "2025-04-16T04:51:24.014Z",
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"datePublished": "2025-07-25T14:16:44.846Z",
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"dateUpdated": "2026-10-15T21:52:15.805Z"
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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": "2026-08-05T12:01:47.114Z"
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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\nperf: Fix sample vs do_exit()\n\nBaisheng Gao reported an ARM64 crash, which Mark decoded as being a\nsynchronous external abort -- most likely due to trying to access\nMMIO in bad ways.\n\nThe crash further shows perf trying to do a user stack sample while in\nexit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address\nspace it is trying to access.\n\nIt turns out that we stop perf after we tear down the userspace mm; a\nreceipie for disaster, since perf likes to access userspace for\nvarious reasons.\n\nFlip this order by moving up where we stop perf in do_exit().\n\nAdditionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER\nto abort when the current task does not have an mm (exit_mm() makes\nsure to set current->mm = NULL; before commencing with the actual\nteardown). Such that CPU wide events don't trip on this same problem."
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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 vulnerability is reached through the `perf_event_open(2)` syscall creating a sampling event with `PERF_SAMPLE_STACK_USER`/`PERF_SAMPLE_CALLCHAIN`, plus a normal task exit. No network or physical component is involved.\nAC:L - The attacker controls both sides of the race — it creates the sampling event, chooses when the task calls `exit_group()`, and can widen the `exit_mmap()` window arbitrarily by mapping a large address space with many VMAs; failed attempts are free and can be repeated thousands of times per second via forked children with `attr.inherit=1`.\nPR:L - An ordinary unprivileged user can do this at the upstream default `perf_event_paranoid=2` — `PERF_SAMPLE_STACK_USER`/`PERF_SAMPLE_CALLCHAIN` have no capability gate, per-task events on one's own tasks need only `ptrace_may_access`, and `exclude_kernel=1` samples that skid into kernel mode are deliberately not dropped (revert 6a8a75f32357; `sample_is_allowed()` only guards `sigtrap`). On the widely deployed `perf_event_paranoid<=1` systems it is fully deterministic with software clock events.\nUI:N - The attacker triggers everything from its own processes — open the event, exit the task. No victim action, no privileged profiler, and no administrator involvement is required.\nS:U - The unsafe access and its consequences are contained within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `__copy_from_user_inatomic()`/`__get_user()` read through an mm whose data pages and page-table pages have already been freed and can be reallocated, and the harvested bytes are written verbatim into the attacker-readable perf ring buffer — a use-after-free read that can disclose freed/reused memory or, via a walk through a recycled page-table page, effectively arbitrary physical memory.\nI:H - The use-after-free on the page tables makes the CPU issue accesses to attacker-groomable, arbitrary physical addresses; per UAF scoring guidance this is High, and it is concretely damaging because the reported case lands on MMIO, where reads carry side effects (read-to-clear status, FIFO pops) that corrupt device and system state.\nA:H - The reported failure is a fatal kernel abort — on arm64 `do_sea()` routes the synchronous external abort to `arm64_notify_die()` with `SIGKILL/SI_KERNEL`, which in kernel mode is an unrecoverable oops/panic; the attacker can trigger it repeatedly, giving a reliable full system DoS."
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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/events/core.c",
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"kernel/exit.c"
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],
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"versions": [
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{
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"version": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "7b8f3c72175c6a63a95cf2e219f8b78e2baad34e",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "507c9a595bad3abd107c6a8857d7fd125d89f386",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "a9f6aab7910a0ef2895797f15c947f6d1053160f",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "975ffddfa2e19823c719459d2364fcaa17673964",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "2ee6044a693735396bb47eeaba1ac3ae26c1c99b",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "456019adaa2f5366b89c868dea9b483179bece54",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "7311970d07c4606362081250da95f2c7901fc0db",
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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": "c5ebcedb566ef17bda7b02686e0d658a7bb42ee7",
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"lessThan": "4f6fc782128355931527cefe3eb45338abd8ab39",
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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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"kernel/events/core.c",
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"kernel/exit.c"
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],
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"versions": [
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{
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"version": "3.7",
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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": "3.7",
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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": "5.4.295",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.239",
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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": "5.15.186",
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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": "6.1.142",
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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": "6.6.95",
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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": "6.12.35",
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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": "6.15.4",
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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": "3.7",
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"versionEndExcluding": "5.4.295"
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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": "3.7",
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"versionEndExcluding": "5.10.239"
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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": "3.7",
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"versionEndExcluding": "5.15.186"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.7",
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"versionEndExcluding": "6.1.142"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.7",
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"versionEndExcluding": "6.6.95"
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"versionEndExcluding": "6.12.35"
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"versionStartIncluding": "3.7",
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"versionEndExcluding": "6.15.4"
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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": "3.7",
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"versionEndExcluding": "6.16"
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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/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e"
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},
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{
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"url": "https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386"
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},
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{
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"url": "https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f"
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},
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{
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"url": "https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964"
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},
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{
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"url": "https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b"
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},
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{
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"url": "https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54"
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},
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{
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"url": "https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39"
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}
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],
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"title": "perf: Fix sample vs do_exit()",
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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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"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/2025/10/msg00008.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.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": "2025-11-03T17:37:54.380Z"
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}
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},
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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-2025-38424",
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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": "2026-10-15T21:50:16.738401Z"
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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": "2026-10-15T21:52:15.805Z"
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}
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}
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]
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}
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} |