171 lines
9.1 KiB
JSON
171 lines
9.1 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-2022-48950",
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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": "2024-08-22T01:27:53.625Z",
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"datePublished": "2024-10-21T20:05:38.440Z",
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"dateUpdated": "2026-08-05T08:53:05.541Z"
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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": "2026-08-05T08:53:05.541Z"
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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 perf_pending_task() UaF\n\nPer syzbot it is possible for perf_pending_task() to run after the\nevent is free()'d. There are two related but distinct cases:\n\n - the task_work was already queued before destroying the event;\n - destroying the event itself queues the task_work.\n\nThe first cannot be solved using task_work_cancel() since\nperf_release() itself might be called from a task_work (____fput),\nwhich means the current->task_works list is already empty and\ntask_work_cancel() won't be able to find the perf_pending_task()\nentry.\n\nThe simplest alternative is extending the perf_event lifetime to cover\nthe task_work.\n\nThe second is just silly, queueing a task_work while you know the\nevent is going away makes no sense and is easily avoided by\nre-arranging how the event is marked STATE_DEAD and ensuring it goes\nthrough STATE_OFF on the way down."
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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 path is reached via the local perf_event_open(2) syscall and subsequent event close/release; it is not reachable from the network stack or remote protocols.\nAC:L - An attacker fully controls event creation, overflow/sigtrap triggering, and close/destroy; destroying an event with pending_sigtrap itself queues perf_pending_task then frees the object, so the UAF does not depend on conditions outside attacker influence.\nPR:L - Unprivileged users can open sampling events with attr.sigtrap on their own tasks because ptrace_may_access succeeds for same_thread_group self-access, and default perf_event_paranoid still allows self-monitoring with exclude_kernel.\nUI:N - Exploitation requires only the attacker's own syscalls (perf_event_open, activity to overflow, close/exit); no victim user action is needed.\nS:U - Impact is confined to the local kernel privilege boundary (standard local privilege escalation); this is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - This is a use-after-free of a large perf_event slab object (~1.4KB); after free, perf_pending_task/perf_sigtrap dereference attacker-sprayable memory, enabling arbitrary kernel read primitives.\nI:H - The same UAF provides a write/control-flow hijack surface via heap reuse of the freed perf_event (including callback_head and ctx pointer use), enabling arbitrary kernel write and code execution.\nA:H - The UAF reliably causes kernel oops/panic (demonstrated by syzbot KASAN crashes in task_work_run/perf_pending_task), fully impacting system availability."
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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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],
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"versions": [
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{
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"version": "ca7b0a10287e2733bdafb01ef0d4038536625fe3",
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"lessThan": "8bffa95ac19ff27c8261904f89d36c7fcf215d59",
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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": "078c12ccf1fb943cc18c84894c76113dc89e5975",
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"lessThan": "78e1317a174edbfd1182599bf76c092a2877672c",
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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": "ca6c21327c6af02b7eec31ce4b9a740a18c6c13f",
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"lessThan": "517e6a301f34613bff24a8e35b5455884f2d83d8",
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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": "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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],
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"versions": [
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{
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"version": "5.15.77",
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"lessThan": "5.15.84",
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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": "6.0.7",
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"lessThan": "6.0.14",
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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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"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": "5.15.77",
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"versionEndExcluding": "5.15.84"
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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": "6.0.7",
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"versionEndExcluding": "6.0.14"
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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/8bffa95ac19ff27c8261904f89d36c7fcf215d59"
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},
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{
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"url": "https://git.kernel.org/stable/c/78e1317a174edbfd1182599bf76c092a2877672c"
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},
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{
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"url": "https://git.kernel.org/stable/c/517e6a301f34613bff24a8e35b5455884f2d83d8"
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}
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],
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"title": "perf: Fix perf_pending_task() UaF",
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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-2022-48950",
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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": "2024-10-22T13:21:45.788376Z"
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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": "2024-10-22T13:28:40.788Z"
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}
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}
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]
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}
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} |