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perf/x86/intel: Prevent drain_pebs() reentry

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-97960

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97960

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "arch/x86/events/intel/core.c",
      "arch/x86/events/intel/ds.c",
      "arch/x86/events/perf_event.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/x86/events/intel/core.c",
      "arch/x86/events/intel/ds.c",
      "arch/x86/events/perf_event.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97960

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48816 · Revision 1
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Publisher date
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