github - ghsa-px9x-jp5p-m4g4

GHSA-PX9X-JP5P-M4G4

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 21:30

Details

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

alloc_tag: allocate percpu counters for module tags dynamically

When a module gets unloaded it checks whether any of its tags are still in use and if so, we keep the memory containing module's allocation tags alive until all tags are unused. However percpu counters referenced by the tags are freed by free_module(). This will lead to UAF if the memory allocated by a module is accessed after module was unloaded.

To fix this we allocate percpu counters for module allocation tags dynamically and we keep it alive for tags which are still in use after module unloading. This also removes the requirement of a larger PERCPU_MODULE_RESERVE when memory allocation profiling is enabled because percpu memory for counters does not need to be reserved anymore.

Severity ?

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38076"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T10:15:41Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nalloc_tag: allocate percpu counters for module tags dynamically\n\nWhen a module gets unloaded it checks whether any of its tags are still in\nuse and if so, we keep the memory containing module\u0027s allocation tags\nalive until all tags are unused.  However percpu counters referenced by\nthe tags are freed by free_module().  This will lead to UAF if the memory\nallocated by a module is accessed after module was unloaded.\n\nTo fix this we allocate percpu counters for module allocation tags\ndynamically and we keep it alive for tags which are still in use after\nmodule unloading.  This also removes the requirement of a larger\nPERCPU_MODULE_RESERVE when memory allocation profiling is enabled because\npercpu memory for counters does not need to be reserved anymore.",
  "id": "GHSA-px9x-jp5p-m4g4",
  "modified": "2025-11-14T21:30:27Z",
  "published": "2025-06-18T12:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38076"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/12ca42c237756182aad8ab04654c952765cb9061"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cc733e6d96c938d2b82be96858a0ab900eb6fdc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38076 (GCVE-0-2025-38076)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2025-06-18 09:33

Summary

In the Linux kernel, the following vulnerability has been resolved: alloc_tag: allocate percpu counters for module tags dynamically When a module gets unloaded it checks whether any of its tags are still in use and if so, we keep the memory containing module's allocation tags alive until all tags are unused. However percpu counters referenced by the tags are freed by free_module(). This will lead to UAF if the memory allocated by a module is accessed after module was unloaded. To fix this we allocate percpu counters for module allocation tags dynamically and we keep it alive for tags which are still in use after module unloading. This also removes the requirement of a larger PERCPU_MODULE_RESERVE when memory allocation profiling is enabled because percpu memory for counters does not need to be reserved anymore.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3cc733e6d96c938d2…
	https://git.kernel.org/stable/c/12ca42c237756182a…

Impacted products

Vendor

Product

Version

Linux

Affected: 0db6f8d7820a4b788565dac8eed52bfc2c3216da , < 3cc733e6d96c938d2b82be96858a0ab900eb6fdc (git)
Affected: 0db6f8d7820a4b788565dac8eed52bfc2c3216da , < 12ca42c237756182aad8ab04654c952765cb9061 (git)

Linux

Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/alloc_tag.h",
            "include/linux/codetag.h",
            "include/linux/percpu.h",
            "lib/alloc_tag.c",
            "lib/codetag.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3cc733e6d96c938d2b82be96858a0ab900eb6fdc",
              "status": "affected",
              "version": "0db6f8d7820a4b788565dac8eed52bfc2c3216da",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "0db6f8d7820a4b788565dac8eed52bfc2c3216da",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/alloc_tag.h",
            "include/linux/codetag.h",
            "include/linux/percpu.h",
            "lib/alloc_tag.c",
            "lib/codetag.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
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              "operator": "OR"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nalloc_tag: allocate percpu counters for module tags dynamically\n\nWhen a module gets unloaded it checks whether any of its tags are still in\nuse and if so, we keep the memory containing module\u0027s allocation tags\nalive until all tags are unused.  However percpu counters referenced by\nthe tags are freed by free_module().  This will lead to UAF if the memory\nallocated by a module is accessed after module was unloaded.\n\nTo fix this we allocate percpu counters for module allocation tags\ndynamically and we keep it alive for tags which are still in use after\nmodule unloading.  This also removes the requirement of a larger\nPERCPU_MODULE_RESERVE when memory allocation profiling is enabled because\npercpu memory for counters does not need to be reserved anymore."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:33:51.293Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/12ca42c237756182aad8ab04654c952765cb9061"
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    "datePublished": "2025-06-18T09:33:51.293Z",
    "dateReserved": "2025-04-16T04:51:23.980Z",
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    "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-PX9X-JP5P-M4G4

CVE-2025-38076 (GCVE-0-2025-38076)

Tags

Sightings

Nomenclature