github - ghsa-m482-hf2v-9c7j

GHSA-M482-HF2V-9C7J

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2025-11-28 15:30

Details

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

perf/core: Handle buffer mapping fail correctly in perf_mmap()

After successful allocation of a buffer or a successful attachment to an existing buffer perf_mmap() tries to map the buffer read only into the page table. If that fails, the already set up page table entries are zapped, but the other perf specific side effects of that failure are not handled. The calling code just cleans up the VMA and does not invoke perf_mmap_close().

This leaks reference counts, corrupts user->vm accounting and also results in an unbalanced invocation of event::event_mapped().

Cure this by moving the event::event_mapped() invocation before the map_range() call so that on map_range() failure perf_mmap_close() can be invoked without causing an unbalanced event::event_unmapped() call.

perf_mmap_close() undoes the reference counts and eventually frees buffers.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38564"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:32Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Handle buffer mapping fail correctly in perf_mmap()\n\nAfter successful allocation of a buffer or a successful attachment to an\nexisting buffer perf_mmap() tries to map the buffer read only into the page\ntable. If that fails, the already set up page table entries are zapped, but\nthe other perf specific side effects of that failure are not handled.  The\ncalling code just cleans up the VMA and does not invoke perf_mmap_close().\n\nThis leaks reference counts, corrupts user-\u003evm accounting and also results\nin an unbalanced invocation of event::event_mapped().\n\nCure this by moving the event::event_mapped() invocation before the\nmap_range() call so that on map_range() failure perf_mmap_close() can be\ninvoked without causing an unbalanced event::event_unmapped() call.\n\nperf_mmap_close() undoes the reference counts and eventually frees buffers.",
  "id": "GHSA-m482-hf2v-9c7j",
  "modified": "2025-11-28T15:30:29Z",
  "published": "2025-08-19T18:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38564"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/831e1c90a5d72e6977a57c44f47c46b73a438695"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9025f73c88d9d6e125743a43afc569da3ce5328"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f74b9f4ba63ffdf597aaaa6cad7e284cb8e04820"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38564 (GCVE-0-2025-38564)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2025-09-29 05:53

Summary

In the Linux kernel, the following vulnerability has been resolved: perf/core: Handle buffer mapping fail correctly in perf_mmap() After successful allocation of a buffer or a successful attachment to an existing buffer perf_mmap() tries to map the buffer read only into the page table. If that fails, the already set up page table entries are zapped, but the other perf specific side effects of that failure are not handled. The calling code just cleans up the VMA and does not invoke perf_mmap_close(). This leaks reference counts, corrupts user->vm accounting and also results in an unbalanced invocation of event::event_mapped(). Cure this by moving the event::event_mapped() invocation before the map_range() call so that on map_range() failure perf_mmap_close() can be invoked without causing an unbalanced event::event_unmapped() call. perf_mmap_close() undoes the reference counts and eventually frees buffers.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/831e1c90a5d72e697…
	https://git.kernel.org/stable/c/a9025f73c88d9d6e1…
	https://git.kernel.org/stable/c/f74b9f4ba63ffdf59…

Impacted products

Vendor

Product

Version

Linux

Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < 831e1c90a5d72e6977a57c44f47c46b73a438695 (git)
Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < a9025f73c88d9d6e125743a43afc569da3ce5328 (git)
Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < f74b9f4ba63ffdf597aaaa6cad7e284cb8e04820 (git)

Linux

Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "831e1c90a5d72e6977a57c44f47c46b73a438695",
              "status": "affected",
              "version": "b709eb872e19a19607bbb6d2975bc264d59735cf",
              "versionType": "git"
            },
            {
              "lessThan": "a9025f73c88d9d6e125743a43afc569da3ce5328",
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              "version": "b709eb872e19a19607bbb6d2975bc264d59735cf",
              "versionType": "git"
            },
            {
              "lessThan": "f74b9f4ba63ffdf597aaaa6cad7e284cb8e04820",
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            }
          ]
        },
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          "versions": [
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              "status": "affected",
              "version": "6.14"
            },
            {
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              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                }
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Handle buffer mapping fail correctly in perf_mmap()\n\nAfter successful allocation of a buffer or a successful attachment to an\nexisting buffer perf_mmap() tries to map the buffer read only into the page\ntable. If that fails, the already set up page table entries are zapped, but\nthe other perf specific side effects of that failure are not handled.  The\ncalling code just cleans up the VMA and does not invoke perf_mmap_close().\n\nThis leaks reference counts, corrupts user-\u003evm accounting and also results\nin an unbalanced invocation of event::event_mapped().\n\nCure this by moving the event::event_mapped() invocation before the\nmap_range() call so that on map_range() failure perf_mmap_close() can be\ninvoked without causing an unbalanced event::event_unmapped() call.\n\nperf_mmap_close() undoes the reference counts and eventually frees buffers."
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      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:53:52.640Z",
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        {
          "url": "https://git.kernel.org/stable/c/f74b9f4ba63ffdf597aaaa6cad7e284cb8e04820"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38564",
    "datePublished": "2025-08-19T17:02:40.942Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-09-29T05:53:52.640Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-M482-HF2V-9C7J

CVE-2025-38564 (GCVE-0-2025-38564)

Tags

Sightings

Nomenclature