CVE-2026-64556 (GCVE-0-2026-64556)

Vulnerability from cvelistv5 – Published: 2026-07-29 08:01 – Updated: 2026-07-30 06:06
VLAI
Title
perf/core: Detach event groups during remove_on_exec
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/core: Detach event groups during remove_on_exec perf_event_remove_on_exec() removes events by calling perf_event_exit_event(). For top-level events, this removes the event from the context with DETACH_EXIT only. This can leave inconsistent group state when a removed event is a group leader and the group contains siblings without remove_on_exec. If the group was active, the surviving siblings can remain active and attached to the removed leader's sibling list, but are no longer represented by a valid group leader on the PMU context active lists. A later close of the removed leader uses DETACH_GROUP and can promote the still-active siblings from this stale group state. The next schedule-in can then add an already-linked active_list entry again, corrupting the PMU context active list. With DEBUG_LIST enabled, this is caught as a list_add double-add in merge_sched_in(). Fix this by detaching group relationships when remove_on_exec removes an event. This preserves the existing task-exit and revoke behavior, while ensuring surviving siblings are ungrouped before the removed event leaves the context.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2e498d0a74e5b88a6689ae1b811f247f91ff188e , < 4cdb1b3ab96eb1b7eb70bc5c82fede334bd60df2 (git)
Affected: 2e498d0a74e5b88a6689ae1b811f247f91ff188e , < 39358e856fb89e62e3c8d7389a2dc4ec33dbe90e (git)
Affected: 2e498d0a74e5b88a6689ae1b811f247f91ff188e , < a2d5d3ee7b6e3953114726b1521e62123ab5b043 (git)
Affected: 2e498d0a74e5b88a6689ae1b811f247f91ff188e , < 06ccef0434e98058ddae7bcebc901f93d22b7653 (git)
Affected: 2e498d0a74e5b88a6689ae1b811f247f91ff188e , < 037a3c43edfb597665dd34457cd22b14692f2ba3 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix)
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{
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          "url": "https://git.kernel.org/stable/c/037a3c43edfb597665dd34457cd22b14692f2ba3"
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    "dateReserved": "2026-07-19T15:36:31.796Z",
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    "state": "PUBLISHED"
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    "redhat_vex": {
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      "current_release_date": "2026-07-30T07:44:13+00:00",
      "cve": "CVE-2026-64556",
      "id": "CVE-2026-64556",
      "initial_release_date": "2026-07-29T00:00:00+00:00",
      "product_status:known_affected": "232",
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      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: perf/core: Detach event groups during remove_on_exec",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64556.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-07-30T16:30:27Z",
      "cve": "CVE-2026-64556",
      "id": "CVE-2026-64556",
      "initial_release_date": "2026-07-30T16:30:27Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64556",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64556.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.