Vulnerability-Lookup

FKIE_CVE-2025-38396

Vulnerability from fkie_nvd - Published: 2025-07-25 13:15 - Updated: 2025-12-23 19:36

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/66d29d757c968d2bee9124816da5d718eb352959	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6ca45ea48530332a4ba09595767bd26d3232743b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cbe4134ea4bc493239786220bd69cb8a13493190	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e3eed01347721cd7a8819568161c91d538fbf229	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f94c422157f3e43dd31990567b3e5d54b3e5b32b	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
linux	linux_kernel	6.16
debian	debian_linux	11.0

JSON

To clipboard

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      "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs: exportar anon_inode_make_secure_inode() y corregir la omisi\u00f3n de LSM de secretmem Exportar anon_inode_make_secure_inode() para permitir que KVM guest_memfd cree inodos an\u00f3nimos con el contexto de seguridad adecuado. Esto reemplaza el patr\u00f3n actual de llamar a alloc_anon_inode() seguido de inode_init_security_anon() para crear el contexto de seguridad manualmente. Este cambio tambi\u00e9n corrige una regresi\u00f3n de seguridad en secretmem donde el indicador S_PRIVATE no se borr\u00f3 despu\u00e9s de alloc_anon_inode(), lo que provoc\u00f3 que se omitieran las comprobaciones de LSM/SELinux para los descriptores de archivos de secretmem. Como guest_memfd reside actualmente en el m\u00f3dulo KVM, necesitamos exportar este s\u00edmbolo para su uso fuera del n\u00facleo del kernel. En el futuro, guest_memfd podr\u00eda moverse a core-mm, en cuyo punto los s\u00edmbolos ya no tendr\u00edan que exportarse. Cu\u00e1ndo/si eso sucede a\u00fan no est\u00e1 claro."
    }
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  "lastModified": "2025-12-23T19:36:33.210",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "impactScore": 5.9,
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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

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

FKIE_CVE-2025-38396

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

Tags

Sightings

Nomenclature