github - ghsa-64pc-rqj8-96w6

ghsa-64pc-rqj8-96w6

Vulnerability from github

Published

2025-09-16 15:32

Modified

2025-09-16 15:32

Details

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

efi: stmm: Fix incorrect buffer allocation method

The communication buffer allocated by setup_mm_hdr() is later on passed to tee_shm_register_kernel_buf(). The latter expects those buffers to be contiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause various corruptions or BUGs, specifically since commit 9aec2fb0fd5e ("slab: allocate frozen pages"), though it was broken before as well.

Fix this by using alloc_pages_exact() instead of kmalloc().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39836"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-16T14:15:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: stmm: Fix incorrect buffer allocation method\n\nThe communication buffer allocated by setup_mm_hdr() is later on passed\nto tee_shm_register_kernel_buf(). The latter expects those buffers to be\ncontiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause\nvarious corruptions or BUGs, specifically since commit 9aec2fb0fd5e\n(\"slab: allocate frozen pages\"), though it was broken before as well.\n\nFix this by using alloc_pages_exact() instead of kmalloc().",
  "id": "GHSA-64pc-rqj8-96w6",
  "modified": "2025-09-16T15:32:36Z",
  "published": "2025-09-16T15:32:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-39836 (GCVE-0-2025-39836)

Vulnerability from cvelistv5

Published

2025-09-16 13:08

Modified

2025-09-16 13:08

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: efi: stmm: Fix incorrect buffer allocation method The communication buffer allocated by setup_mm_hdr() is later on passed to tee_shm_register_kernel_buf(). The latter expects those buffers to be contiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause various corruptions or BUGs, specifically since commit 9aec2fb0fd5e ("slab: allocate frozen pages"), though it was broken before as well. Fix this by using alloc_pages_exact() instead of kmalloc().

References

▼	URL	Tags
	https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3
	https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47
	https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff

Impacted products

Vendor

Product

Version

▼

Linux

Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f
Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f
Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f

Linux

Version: 6.8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/stmm/tee_stmm_efi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "77ff27ff0e4529a003c8a1c2492c111968c378d3",
              "status": "affected",
              "version": "c44b6be62e8dd4ee0a308c36a70620613e6fc55f",
              "versionType": "git"
            },
            {
              "lessThan": "630c0e6064daf84f17aad1a7d9ca76b562e3fe47",
              "status": "affected",
              "version": "c44b6be62e8dd4ee0a308c36a70620613e6fc55f",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c44b6be62e8dd4ee0a308c36a70620613e6fc55f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/stmm/tee_stmm_efi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.45",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.5",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17-rc4",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: stmm: Fix incorrect buffer allocation method\n\nThe communication buffer allocated by setup_mm_hdr() is later on passed\nto tee_shm_register_kernel_buf(). The latter expects those buffers to be\ncontiguous pages, but setup_mm_hdr() just uses kmalloc(). That can cause\nvarious corruptions or BUGs, specifically since commit 9aec2fb0fd5e\n(\"slab: allocate frozen pages\"), though it was broken before as well.\n\nFix this by using alloc_pages_exact() instead of kmalloc()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T13:08:52.326Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3"
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          "url": "https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff"
        }
      ],
      "title": "efi: stmm: Fix incorrect buffer allocation method",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39836",
    "datePublished": "2025-09-16T13:08:52.326Z",
    "dateReserved": "2025-04-16T07:20:57.141Z",
    "dateUpdated": "2025-09-16T13:08:52.326Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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