CVE-2026-97960
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Prevent drain_pebs() reentry The PEBS buffer is shared by all events on a CPU, so drain_pebs() must not be reentered. If so, one instance may observe stale buffer state and potentially access out-of-bound memory. Most invocations happen in NMI context, which naturally prevents reentry. However, drain_pebs() is also reachable from process context via intel_pmu_drain_pebs_buffer(). In those paths, the PMU is often already disabled, but not guaranteed. For example, __intel_pmu_pebs_disable() only disables the target counter, so other active counters can still raise a PMI and interrupt an in-flight drain_pebs(). Here is an example, __perf_addr_filters_adjust() perf_event_stop() __perf_event_stop() x86_pmu_stop() (event->pmu->stop) intel_pmu_disable_event() intel_pmu_pebs_disable() __intel_pmu_pebs_disable() intel_pmu_drain_large_pebs() intel_pmu_drain_pebs_buffer() Introduce __intel_pmu_quiesce() and __intel_pmu_resume() helpers and use them in intel_pmu_drain_large_pebs() to disable the full PMU around the intel_pmu_drain_pebs_buffer() call, preventing reentry. Also add a warning in intel_pmu_drain_pebs_buffer() when the full PMU is not disabled.
View original CVE JSON
{
"id": "CVE-2026-97960",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-25T11:17:23.720",
"lastModified": "2026-10-21T13:21:17.560",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/x86/events/intel/core.c",
"arch/x86/events/intel/ds.c",
"arch/x86/events/perf_event.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "b752ea0c28e3f7f0aaaad6abf84f735eebc37a60",
"lessThan": "9882068ed242fcd4743f53027e8c790e88dcafff",
"versionType": "git",
"status": "affected"
},
{
"version": "b752ea0c28e3f7f0aaaad6abf84f735eebc37a60",
"lessThan": "999e482fdf89400cc1ae937680fc05096b4c915b",
"versionType": "git",
"status": "affected"
},
{
"version": "b752ea0c28e3f7f0aaaad6abf84f735eebc37a60",
"lessThan": "a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af",
"versionType": "git",
"status": "affected"
},
{
"version": "b752ea0c28e3f7f0aaaad6abf84f735eebc37a60",
"lessThan": "c55599c0ec2aa020e41a0599c3044c56d8a2e7d9",
"versionType": "git",
"status": "affected"
},
{
"version": "b752ea0c28e3f7f0aaaad6abf84f735eebc37a60",
"lessThan": "a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c",
"versionType": "git",
"status": "affected"
},
{
"version": "a9165207b2b07415eeb01b3ac8bb84976ec96984",
"versionType": "git",
"status": "affected"
},
{
"version": "6.3.7",
"lessThan": "6.4",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/x86/events/intel/core.c",
"arch/x86/events/intel/ds.c",
"arch/x86/events/perf_event.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.4",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.114",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.53",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.7",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/9882068ed242fcd4743f53027e8c790e88dcafff",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/999e482fdf89400cc1ae937680fc05096b4c915b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c55599c0ec2aa020e41a0599c3044c56d8a2e7d9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}