github - ghsa-6jcw-grc8-h79f

GHSA-6JCW-GRC8-H79F

Vulnerability from github – Published: 2025-12-22 18:30 – Updated: 2025-12-22 18:30

Details

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

tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs

When a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel calls vm_ops->close on each portion. For trace buffer mappings, this results in ring_buffer_unmap() being called multiple times while ring_buffer_map() was only called once.

This causes ring_buffer_unmap() to return -ENODEV on subsequent calls because user_mapped is already 0, triggering a WARN_ON.

Trace buffer mappings cannot support partial mappings because the ring buffer structure requires the complete buffer including the meta page.

Fix this by adding a may_split callback that returns -EINVAL to prevent VMA splits entirely.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68329"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-22T17:16:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops-\u003eclose on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely.",
  "id": "GHSA-6jcw-grc8-h79f",
  "modified": "2025-12-22T18:30:25Z",
  "published": "2025-12-22T18:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68329"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-68329 (GCVE-0-2025-68329)

Vulnerability from cvelistv5 – Published: 2025-12-22 16:12 – Updated: 2025-12-22 16:14

Title

tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs

Summary

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs When a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel calls vm_ops->close on each portion. For trace buffer mappings, this results in ring_buffer_unmap() being called multiple times while ring_buffer_map() was only called once. This causes ring_buffer_unmap() to return -ENODEV on subsequent calls because user_mapped is already 0, triggering a WARN_ON. Trace buffer mappings cannot support partial mappings because the ring buffer structure requires the complete buffer including the meta page. Fix this by adding a may_split callback that returns -EINVAL to prevent VMA splits entirely.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/922fdd0b755a84f99…
	https://git.kernel.org/stable/c/45053c12c45f0fb8e…
	https://git.kernel.org/stable/c/b042fdf18e89a3471…

Impacted products

Vendor

Product

Version

Linux

Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < 922fdd0b755a84f9933b3ca195f60092b6bb88ee (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < 45053c12c45f0fb8ef6ab95118dd928d2fec0255 (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < b042fdf18e89a347177a49e795d8e5184778b5b6 (git)

Linux

Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "922fdd0b755a84f9933b3ca195f60092b6bb88ee",
              "status": "affected",
              "version": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64",
              "versionType": "git"
            },
            {
              "lessThan": "45053c12c45f0fb8ef6ab95118dd928d2fec0255",
              "status": "affected",
              "version": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64",
              "versionType": "git"
            },
            {
              "lessThan": "b042fdf18e89a347177a49e795d8e5184778b5b6",
              "status": "affected",
              "version": "cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.61",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.61",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops-\u003eclose on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-22T16:14:06.466Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"
        },
        {
          "url": "https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"
        }
      ],
      "title": "tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68329",
    "datePublished": "2025-12-22T16:12:23.133Z",
    "dateReserved": "2025-12-16T14:48:05.296Z",
    "dateUpdated": "2025-12-22T16:14:06.466Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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GHSA-6JCW-GRC8-H79F

CVE-2025-68329 (GCVE-0-2025-68329)

Tags

Sightings

Nomenclature