CVE-2025-38396 (GCVE-0-2025-38396)
Vulnerability from cvelistv5
Published
2025-07-25 12:53
Modified
2025-07-28 04:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass Export anon_inode_make_secure_inode() to allow KVM guest_memfd to create anonymous inodes with proper security context. This replaces the current pattern of calling alloc_anon_inode() followed by inode_init_security_anon() for creating security context manually. This change also fixes a security regression in secretmem where the S_PRIVATE flag was not cleared after alloc_anon_inode(), causing LSM/SELinux checks to be bypassed for secretmem file descriptors. As guest_memfd currently resides in the KVM module, we need to export this symbol for use outside the core kernel. In the future, guest_memfd might be moved to core-mm, at which point the symbols no longer would have to be exported. When/if that happens is still unclear.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2bfe15c5261212130f1a71f32a300bcf426443d4
Version: 2bfe15c5261212130f1a71f32a300bcf426443d4
Version: 2bfe15c5261212130f1a71f32a300bcf426443d4
Version: 2bfe15c5261212130f1a71f32a300bcf426443d4
Version: 2bfe15c5261212130f1a71f32a300bcf426443d4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/anon_inodes.c",
            "include/linux/fs.h",
            "mm/secretmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            "include/linux/fs.h",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "status": "unaffected",
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            {
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              "version": "6.15.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass\n\nExport anon_inode_make_secure_inode() to allow KVM guest_memfd to create\nanonymous inodes with proper security context. This replaces the current\npattern of calling alloc_anon_inode() followed by\ninode_init_security_anon() for creating security context manually.\n\nThis change also fixes a security regression in secretmem where the\nS_PRIVATE flag was not cleared after alloc_anon_inode(), causing\nLSM/SELinux checks to be bypassed for secretmem file descriptors.\n\nAs guest_memfd currently resides in the KVM module, we need to export this\nsymbol for use outside the core kernel. In the future, guest_memfd might be\nmoved to core-mm, at which point the symbols no longer would have to be\nexported. When/if that happens is still unclear."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:21:02.058Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/66d29d757c968d2bee9124816da5d718eb352959"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/f94c422157f3e43dd31990567b3e5d54b3e5b32b"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ca45ea48530332a4ba09595767bd26d3232743b"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbe4134ea4bc493239786220bd69cb8a13493190"
        }
      ],
      "title": "fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38396",
    "datePublished": "2025-07-25T12:53:40.761Z",
    "dateReserved": "2025-04-16T04:51:24.011Z",
    "dateUpdated": "2025-07-28T04:21:02.058Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
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  }
}


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