{"id":"CVE-2026-97960","revision":"85c97e9698554cf69ab9341fec9f0a38","records":[{"revision":"85c97e9698554cf69ab9341fec9f0a38","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97960","aliases":[],"title":"perf/x86/intel: Prevent drain_pebs() reentry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/intel: Prevent drain_pebs() reentry\n\nThe PEBS buffer is shared by all events on a CPU, so drain_pebs() must\nnot be reentered. If so, one instance may observe stale buffer state and\npotentially access out-of-bound memory.\n\nMost invocations happen in NMI context, which naturally prevents reentry.\nHowever, drain_pebs() is also reachable from process context via\nintel_pmu_drain_pebs_buffer().\n\nIn those paths, the PMU is often already disabled, but not guaranteed.\nFor example, __intel_pmu_pebs_disable() only disables the target counter,\nso other active counters can still raise a PMI and interrupt an in-flight\ndrain_pebs(). Here is an example,\n\n__perf_addr_filters_adjust()\n  perf_event_stop()\n    __perf_event_stop()\n      x86_pmu_stop() (event->pmu->stop)\n        intel_pmu_disable_event()\n          intel_pmu_pebs_disable()\n            __intel_pmu_pebs_disable()\n              intel_pmu_drain_large_pebs()\n                intel_pmu_drain_pebs_buffer()\n\nIntroduce __intel_pmu_quiesce() and __intel_pmu_resume() helpers and\nuse them in intel_pmu_drain_large_pebs() to disable the full PMU\naround the intel_pmu_drain_pebs_buffer() call, preventing reentry.\n\nAlso add a warning in intel_pmu_drain_pebs_buffer() when the full PMU is\nnot disabled.","state":0,"publishedAt":"2026-09-25T10:23:04.943+00:00","modifiedAt":"2026-10-21T12:53:50.943+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/events/intel/core.c\",\n                        \"arch/x86/events/intel/ds.c\",\n                        \"arch/x86/events/perf_event.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b752ea0c28e3f7f0aaaad6abf84f735eebc37a60\",\n                            \"lessThan\": \"9882068ed242fcd4743f53027e8c790e88dcafff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b752ea0c28e3f7f0aaaad6abf84f735eebc37a60\",\n                            \"lessThan\": \"999e482fdf89400cc1ae937680fc05096b4c915b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b752ea0c28e3f7f0aaaad6abf84f735eebc37a60\",\n                            \"lessThan\": \"a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b752ea0c28e3f7f0aaaad6abf84f735eebc37a60\",\n                            \"lessThan\": \"c55599c0ec2aa020e41a0599c3044c56d8a2e7d9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b752ea0c28e3f7f0aaaad6abf84f735eebc37a60\",\n                            \"lessThan\": \"a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a9165207b2b07415eeb01b3ac8bb84976ec96984\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.3.7\",\n                            \"lessThan\": \"6.4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/events/intel/core.c\",\n                        \"arch/x86/events/intel/ds.c\",\n                        \"arch/x86/events/perf_event.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.4\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/9882068ed242fcd4743f53027e8c790e88dcafff","https://git.kernel.org/stable/c/999e482fdf89400cc1ae937680fc05096b4c915b","https://git.kernel.org/stable/c/a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af","https://git.kernel.org/stable/c/c55599c0ec2aa020e41a0599c3044c56d8a2e7d9","https://git.kernel.org/stable/c/a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97960","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97960","identifiers":["CVE-2026-97960"]},"retained":false,"historicalAffected":[]}],"coverage":[]}