CVE-2026-99187

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99187", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.400Z", "datePublished": "2026-10-28T10:35:44.813Z", "dateUpdated": "2026-10-30T12:42:46.871Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:46.871Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix perf_pmu_migrate_context() leaving events behind\n\n__perf_pmu_remove() walks the group leaders of a CPU and PMU with\nperf_event_groups_for_cpu_pmu(), removing each one as it goes.\nperf_remove_from_context() takes the leader out of the groups rbtree,\nafter which rb_next() on that node returns NULL, prematurely ending the\nwalk. Other groups stay behind in the source context.\n\nOn CPU hotplug, they are then torn down with the dying CPU. They keep\nrunning until teardown, while the PMU's interrupt and migrated events\nare on a new CPU, which drivers rely on never happening.\n\nWalk ctx->event_list instead and pick out the PMU's events by their\npmu_ctx."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "d4002e954c612dfc7e3fb5549e4a188ea281fe35", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "3eb08f09bfb364051f51316da873c3bd51a839ef", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "f5f0028764de322a3d04eda0d3b6389ca9847446", "status": "affected", "versionType": "git"}, {"version": "bd27568117664b8b3e259721393df420ed51f57b", "lessThan": "e76b36b4be7160eaa14b416681e548b125702395", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7"}, {"url": "https://git.kernel.org/stable/c/d4002e954c612dfc7e3fb5549e4a188ea281fe35"}, {"url": "https://git.kernel.org/stable/c/3eb08f09bfb364051f51316da873c3bd51a839ef"}, {"url": "https://git.kernel.org/stable/c/f5f0028764de322a3d04eda0d3b6389ca9847446"}, {"url": "https://git.kernel.org/stable/c/e76b36b4be7160eaa14b416681e548b125702395"}], "title": "perf: Fix perf_pmu_migrate_context() leaving events behind", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7", "status": "affected", "version": "bd27568117664b8b3e259721393df420ed51f57b", "versionType": "git"}, {"lessThan": "d4002e954c612dfc7e3fb5549e4a188ea281fe35", "status": "affected", "version": "bd27568117664b8b3e259721393df420ed51f57b", "versionType": "git"}, {"lessThan": "3eb08f09bfb364051f51316da873c3bd51a839ef", "status": "affected", "version": "bd27568117664b8b3e259721393df420ed51f57b", "versionType": "git"}, {"lessThan": "f5f0028764de322a3d04eda0d3b6389ca9847446", "status": "affected", "version": "bd27568117664b8b3e259721393df420ed51f57b", "versionType": "git"}, {"lessThan": "e76b36b4be7160eaa14b416681e548b125702395", "status": "affected", "version": "bd27568117664b8b3e259721393df420ed51f57b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"lessThan": "6.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix perf_pmu_migrate_context() leaving events behind\n\n__perf_pmu_remove() walks the group leaders of a CPU and PMU with\nperf_event_groups_for_cpu_pmu(), removing each one as it goes.\nperf_remove_from_context() takes the leader out of the groups rbtree,\nafter which rb_next() on that node returns NULL, prematurely ending the\nwalk. Other groups stay behind in the source context.\n\nOn CPU hotplug, they are then torn down with the dying CPU. They keep\nrunning until teardown, while the PMU's interrupt and migrated events\nare on a new CPU, which drivers rely on never happening.\n\nWalk ctx->event_list instead and pick out the PMU's events by their\npmu_ctx."}], "id": "CVE-2026-99187", "lastModified": "2026-10-30T13:21:52.040", "metrics": {}, "published": "2026-10-28T11:17:39.610", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3eb08f09bfb364051f51316da873c3bd51a839ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4002e954c612dfc7e3fb5549e4a188ea281fe35"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e76b36b4be7160eaa14b416681e548b125702395"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5f0028764de322a3d04eda0d3b6389ca9847446"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service (DoS) via incomplete PMU event migration during CPU hotplug", "id": "2562755", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562755"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-459", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nperf: Fix perf_pmu_migrate_context() leaving events behind\n__perf_pmu_remove() walks the group leaders of a CPU and PMU with\nperf_event_groups_for_cpu_pmu(), removing each one as it goes.\nperf_remove_from_context() takes the leader out of the groups rbtree,\nafter which rb_next() on that node returns NULL, prematurely ending the\nwalk. Other groups stay behind in the source context.\nOn CPU hotplug, they are then torn down with the dying CPU. They keep\nrunning until teardown, while the PMU's interrupt and migrated events\nare on a new CPU, which drivers rely on never happening.\nWalk ctx->event_list instead and pick out the PMU's events by their\npmu_ctx.", "A flaw was found in the Linux kernel. During Central Processing Unit (CPU) hotplug operations, the Performance Monitoring Unit (PMU) context migration prematurely stops processing event groups after removing a leader, leaving active events running on the departing processor. A local user running performance monitoring events during CPU reconfiguration can trigger this flaw, leading to unexpected kernel behavior and potential system crashes that result in a Denial of Service (DoS)."], "name": "CVE-2026-99187", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-28T10:35:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99187\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99187\nhttps://git.kernel.org/stable/c/3eb08f09bfb364051f51316da873c3bd51a839ef\nhttps://git.kernel.org/stable/c/e76b36b4be7160eaa14b416681e548b125702395\nhttps://git.kernel.org/stable/c/f5f0028764de322a3d04eda0d3b6389ca9847446"], "statement": "This vulnerability is rated as having a Moderate impact because an attacker must possess local system access and coincide monitoring activity with runtime CPU hotplugging, limiting practical exploitability. On typical Red Hat Enterprise Linux deployments, dynamic processor offlining or addition is an infrequent administrative or virtualization event rather than a routine user-facing action. Although an incomplete event migration can trigger kernel instability or a denial of service, exploitation cannot be performed remotely and does not lead to privilege escalation or data confidentiality compromise.", "threat_severity": "Moderate"}

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