Vulnerability-Lookup

GHSA-8M46-HM8P-V8RJ

Vulnerability from github – Published: 2025-07-25 15:30 – Updated: 2025-12-23 21:30

Details

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.

Severity ?

7.8 (High)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38396"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-25T13:15:29Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-8m46-hm8p-v8rj",
  "modified": "2025-12-23T21:30:20Z",
  "published": "2025-07-25T15:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38396"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66d29d757c968d2bee9124816da5d718eb352959"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ca45ea48530332a4ba09595767bd26d3232743b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbe4134ea4bc493239786220bd69cb8a13493190"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3eed01347721cd7a8819568161c91d538fbf229"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f94c422157f3e43dd31990567b3e5d54b3e5b32b"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "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-2025-38396 (GCVE-0-2025-38396)

Vulnerability from cvelistv5 – Published: 2025-07-25 12:53 – Updated: 2025-11-03 17:37

Title

fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/66d29d757c968d2be…
	https://git.kernel.org/stable/c/e3eed01347721cd7a…
	https://git.kernel.org/stable/c/f94c422157f3e43dd…
	https://git.kernel.org/stable/c/6ca45ea48530332a4…
	https://git.kernel.org/stable/c/cbe4134ea4bc49323…

Impacted products

Vendor

Product

Version

Linux

Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < 66d29d757c968d2bee9124816da5d718eb352959 (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < e3eed01347721cd7a8819568161c91d538fbf229 (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < f94c422157f3e43dd31990567b3e5d54b3e5b32b (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < 6ca45ea48530332a4ba09595767bd26d3232743b (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < cbe4134ea4bc493239786220bd69cb8a13493190 (git)

Linux

Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.97 , ≤ 6.6.* (semver)
Unaffected: 6.12.37 , ≤ 6.12.* (semver)
Unaffected: 6.15.6 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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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-8M46-HM8P-V8RJ

CVE-2025-38396 (GCVE-0-2025-38396)

Tags

Sightings

Nomenclature