GHSA-8M46-HM8P-V8RJ
Vulnerability from github – Published: 2025-07-25 15:30 – Updated: 2025-12-23 21:30In 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.
{
"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"
}
]
}
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