247 lines
13 KiB
JSON
247 lines
13 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-2026-31528",
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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": "2026-03-09T15:48:24.111Z",
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"datePublished": "2026-04-22T13:54:41.180Z",
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"dateUpdated": "2026-10-19T18:45:55.081Z"
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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": "2026-08-05T12:23:18.524Z"
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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: Make sure to use pmu_ctx->pmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx->pmu.\n\nTurns out, inherit uses event->pmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx->pmu for the\ngroup case."
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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 perf group/inheritance paths are reached through the local perf_event_open syscall and subsequent fork/scheduling/read operations, not by network or physical input.\nAC:L - An attacker controls the perf event group composition, inherit flag, fork, and can create an over-constrained hardware group to force group_sched_in rollback; no uncontrollable race is required.\nPR:L - A normal unprivileged local user can create per-process user-space perf events under the default perf_event_paranoid=2 policy by excluding kernel profiling, so real administrative privileges are not required.\nUI:N - The attacker can trigger the sequence entirely from their own process using perf_event_open and fork/read/scheduling activity without any victim action.\nS:U - The bug corrupts kernel perf/PMU bookkeeping within the same kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The reported out-of-bounds access occurs in kernel PMU bookkeeping and includes memory corruption in per-CPU structures; per the higher-severity rule, this can reasonably be leveraged for kernel information disclosure.\nI:H - The rollback path can drive x86_pmu_del with inconsistent PMU transaction state, causing out-of-bounds writes such as invalid PMU array/bitmap updates, which is kernel memory corruption with potential control-flow or privilege impact.\nA:H - Even without full exploitation, the out-of-bounds kernel access can reliably produce a kernel warning/oops/panic or corrupt PMU state, causing high availability impact."
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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": "bd27568117664b8b3e259721393df420ed51f57b",
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"lessThan": "656f35b463995bee024d948440128230aacd81e1",
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"status": "affected",
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"versionType": "git"
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"version": "bd27568117664b8b3e259721393df420ed51f57b",
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"lessThan": "3a696e84a8b1fafdd774bb30d62919faf844d9e4",
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"status": "affected",
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"lessThan": "35f7914e54fe7f13654c22ee045b05e4b6d8062b",
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"status": "affected",
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"status": "affected",
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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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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "6.6.131",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.80",
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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": "6.18.21",
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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": "6.19.11",
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"lessThanOrEqual": "6.19.*",
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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",
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"
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{
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"url": "https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"
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"url": "https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"
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}
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"title": "perf: Make sure to use pmu_ctx->pmu for groups",
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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-2026-31528",
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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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"version": "2.0.3",
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"timestamp": "2026-10-16T15:10:38.614462Z"
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}
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}
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],
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"problemTypes": [
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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-787",
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"description": "CWE-787 Out-of-bounds Write"
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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": "2026-10-19T18:45:55.081Z"
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} |