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EUVD-2026-320310

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:39

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:39:57.702401+00:00",
  "id": "EUVD-2026-320310"
}

CVE-2022-49607 (GCVE-0-2022-49607)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2026-05-23 15:22

Title

perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()

Summary

In the Linux kernel, the following vulnerability has been resolved: perf/core: Fix data race between perf_event_set_output() and perf_mmap_close() Yang Jihing reported a race between perf_event_set_output() and perf_mmap_close(): CPU1 CPU2 perf_mmap_close(e2) if (atomic_dec_and_test(&e2->rb->mmap_count)) // 1 - > 0 detach_rest = true ioctl(e1, IOC_SET_OUTPUT, e2) perf_event_set_output(e1, e2) ... list_for_each_entry_rcu(e, &e2->rb->event_list, rb_entry) ring_buffer_attach(e, NULL); // e1 isn't yet added and // therefore not detached ring_buffer_attach(e1, e2->rb) list_add_rcu(&e1->rb_entry, &e2->rb->event_list) After this; e1 is attached to an unmapped rb and a subsequent perf_mmap() will loop forever more: again: mutex_lock(&e->mmap_mutex); if (event->rb) { ... if (!atomic_inc_not_zero(&e->rb->mmap_count)) { ... mutex_unlock(&e->mmap_mutex); goto again; } } The loop in perf_mmap_close() holds e2->mmap_mutex, while the attach in perf_event_set_output() holds e1->mmap_mutex. As such there is no serialization to avoid this race. Change perf_event_set_output() to take both e1->mmap_mutex and e2->mmap_mutex to alleviate that problem. Additionally, have the loop in perf_mmap() detach the rb directly, this avoids having to wait for the concurrent perf_mmap_close() to get around to doing it to make progress.

Severity

4.7 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:35 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/3bbd868099287ff90…
https://git.kernel.org/stable/c/f836f9ac95df15f1e…
https://git.kernel.org/stable/c/17f5417194136517e…
https://git.kernel.org/stable/c/98c3c8fd0d4c560e0…
https://git.kernel.org/stable/c/43128b3eee3378241…
https://git.kernel.org/stable/c/da3c256e2d0ebc87c…
https://git.kernel.org/stable/c/a9391ff7a7c5f113d…
https://git.kernel.org/stable/c/68e3c69803dada336…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 3bbd868099287ff9027db59029b502fcfa2202a0 (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < f836f9ac95df15f1e0af4beb0ec20021e8c91998 (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 17f5417194136517ee9bbd6511249e5310e5617c (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 43128b3eee337824158f34da6648163d2f2fb937 (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < da3c256e2d0ebc87c7db0c605c9692b6f1722074 (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < a9391ff7a7c5f113d6f2bf6621d49110950de49c (git) Affected: 9bb5d40cd93c9dd4be74834b1dcb1ba03629716b , < 68e3c69803dada336893640110cb87221bb01dcf (git) Affected: 2487f0db30527032c4d56fc2d0b1a240fe89fef8 (git) Affected: 703197b61d05f5edae54bad3256901c5a5c8794c (git) Affected: c52217e88ae0f3a4ae00562d86e338f8f85969b4 (git) Affected: 3.2.49 , < 3.3 (semver) Affected: 3.4.52 , < 3.5 (semver) Affected: 3.9.8 , < 3.10 (semver)
Linux	Linux	Affected: 3.10 Unaffected: 0 , < 3.10 (semver) Unaffected: 4.9.325 , ≤ 4.9.* (semver) Unaffected: 4.14.290 , ≤ 4.14.* (semver) Unaffected: 4.19.254 , ≤ 4.19.* (semver) Unaffected: 5.4.208 , ≤ 5.4.* (semver) Unaffected: 5.10.134 , ≤ 5.10.* (semver) Unaffected: 5.15.58 , ≤ 5.15.* (semver) Unaffected: 5.18.15 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 4.7,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2022-49607",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:35:03.904350Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
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              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:36:51.711Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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            },
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              "lessThan": "3.3",
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              "version": "3.9.8",
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              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.325",
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            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.290",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.254",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.208",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.134",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.58",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
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                {
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              ],
              "negate": false,
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix data race between perf_event_set_output() and perf_mmap_close()\n\nYang Jihing reported a race between perf_event_set_output() and\nperf_mmap_close():\n\n\tCPU1\t\t\t\t\tCPU2\n\n\tperf_mmap_close(e2)\n\t  if (atomic_dec_and_test(\u0026e2-\u003erb-\u003emmap_count)) // 1 - \u003e 0\n\t    detach_rest = true\n\n\t\t\t\t\t\tioctl(e1, IOC_SET_OUTPUT, e2)\n\t\t\t\t\t\t  perf_event_set_output(e1, e2)\n\n\t  ...\n\t  list_for_each_entry_rcu(e, \u0026e2-\u003erb-\u003eevent_list, rb_entry)\n\t    ring_buffer_attach(e, NULL);\n\t    // e1 isn\u0027t yet added and\n\t    // therefore not detached\n\n\t\t\t\t\t\t    ring_buffer_attach(e1, e2-\u003erb)\n\t\t\t\t\t\t      list_add_rcu(\u0026e1-\u003erb_entry,\n\t\t\t\t\t\t\t\t   \u0026e2-\u003erb-\u003eevent_list)\n\nAfter this; e1 is attached to an unmapped rb and a subsequent\nperf_mmap() will loop forever more:\n\n\tagain:\n\t\tmutex_lock(\u0026e-\u003emmap_mutex);\n\t\tif (event-\u003erb) {\n\t\t\t...\n\t\t\tif (!atomic_inc_not_zero(\u0026e-\u003erb-\u003emmap_count)) {\n\t\t\t\t...\n\t\t\t\tmutex_unlock(\u0026e-\u003emmap_mutex);\n\t\t\t\tgoto again;\n\t\t\t}\n\t\t}\n\nThe loop in perf_mmap_close() holds e2-\u003emmap_mutex, while the attach\nin perf_event_set_output() holds e1-\u003emmap_mutex. As such there is no\nserialization to avoid this race.\n\nChange perf_event_set_output() to take both e1-\u003emmap_mutex and\ne2-\u003emmap_mutex to alleviate that problem. Additionally, have the loop\nin perf_mmap() detach the rb directly, this avoids having to wait for\nthe concurrent perf_mmap_close() to get around to doing it to make\nprogress."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:22:30.837Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3bbd868099287ff9027db59029b502fcfa2202a0"
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        {
          "url": "https://git.kernel.org/stable/c/f836f9ac95df15f1e0af4beb0ec20021e8c91998"
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        {
          "url": "https://git.kernel.org/stable/c/17f5417194136517ee9bbd6511249e5310e5617c"
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        {
          "url": "https://git.kernel.org/stable/c/98c3c8fd0d4c560e0f8335b79c407bbf7fc9462c"
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          "url": "https://git.kernel.org/stable/c/43128b3eee337824158f34da6648163d2f2fb937"
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        {
          "url": "https://git.kernel.org/stable/c/68e3c69803dada336893640110cb87221bb01dcf"
        }
      ],
      "title": "perf/core: Fix data race between perf_event_set_output() and perf_mmap_close()",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49607",
    "datePublished": "2025-02-26T02:23:31.823Z",
    "dateReserved": "2025-02-26T02:21:30.417Z",
    "dateUpdated": "2026-05-23T15:22:30.837Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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EUVD-2026-320310

CVE-2022-49607 (GCVE-0-2022-49607)

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Nomenclature

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