CVE-2025-39836 (GCVE-0-2025-39836)
Vulnerability from cvelistv5
Published
2025-09-16 13:08
Modified
2025-09-29 06:00
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
Impacted products
Vendor Product Version
Linux Linux Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f
Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f
Version: c44b6be62e8dd4ee0a308c36a70620613e6fc55f
 Create a notification for this product.
Show details on NVD website

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"
            },
            {
              "lessThan": "c5e81e672699e0c5557b2b755cc8f7a69aa92bff",
              "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",
              "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",
                  "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": "2025-09-29T06:00:40.674Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff"
        }
      ],
      "title": "efi: stmm: Fix incorrect buffer allocation method",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2025-09-29T06:00:40.674Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39836\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T14:15:51.983\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/630c0e6064daf84f17aad1a7d9ca76b562e3fe47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77ff27ff0e4529a003c8a1c2492c111968c378d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5e81e672699e0c5557b2b755cc8f7a69aa92bff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.