ghsa-m2p9-vjrp-wj7v
Vulnerability from github
Published
2024-12-28 12:30
Modified
2025-09-26 21:30
Severity ?
6.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

s390/cpum_sf: Fix and protect memory allocation of SDBs with mutex

Reservation of the PMU hardware is done at first event creation and is protected by a pair of mutex_lock() and mutex_unlock(). After reservation of the PMU hardware the memory required for the PMUs the event is to be installed on is allocated by allocate_buffers() and alloc_sampling_buffer(). This done outside of the mutex protection. Without mutex protection two or more concurrent invocations of perf_event_init() may run in parallel. This can lead to allocation of Sample Data Blocks (SDBs) multiple times for the same PMU. Prevent this and protect memory allocation of SDBs by mutex.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56706"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-28T10:15:19Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/cpum_sf: Fix and protect memory allocation of SDBs with mutex\n\nReservation of the PMU hardware is done at first event creation\nand is protected by a pair of mutex_lock() and mutex_unlock().\nAfter reservation of the PMU hardware the memory\nrequired for the PMUs the event is to be installed on is\nallocated by allocate_buffers() and alloc_sampling_buffer().\nThis done outside of the mutex protection.\nWithout mutex protection two or more concurrent invocations of\nperf_event_init() may run in parallel.\nThis can lead to allocation of Sample Data Blocks (SDBs)\nmultiple times for the same PMU.\nPrevent this and protect memory allocation of SDBs by\nmutex.",
  "id": "GHSA-m2p9-vjrp-wj7v",
  "modified": "2025-09-26T21:30:26Z",
  "published": "2024-12-28T12:30:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56706"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b3bdfa89635db6a53e02955548bd07bebcae233"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f55bd479d8663a4a4e403b3d308d3d1aa33d92df"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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