Vulnerability-Lookup

FKIE_CVE-2025-71110

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-03-25 19:27

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: mm/slub: reset KASAN tag in defer_free() before accessing freed memory When CONFIG_SLUB_TINY is enabled, kfree_nolock() calls kasan_slab_free() before defer_free(). On ARM64 with MTE (Memory Tagging Extension), kasan_slab_free() poisons the memory and changes the tag from the original (e.g., 0xf3) to a poison tag (0xfe). When defer_free() then tries to write to the freed object to build the deferred free list via llist_add(), the pointer still has the old tag, causing a tag mismatch and triggering a KASAN use-after-free report: BUG: KASAN: slab-use-after-free in defer_free+0x3c/0xbc mm/slub.c:6537 Write at addr f3f000000854f020 by task kworker/u8:6/983 Pointer tag: [f3], memory tag: [fe] Fix this by calling kasan_reset_tag() before accessing the freed memory. This is safe because defer_free() is part of the allocator itself and is expected to manipulate freed memory for bookkeeping purposes.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/53ca00a19d345197a37a1bf552e8d1e7b091666c	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/65d4e5af2a2e82f4fc50d8259aee208fbc6b2c1d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.18
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
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    {
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            },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: reset KASAN tag in defer_free() before accessing freed memory\n\nWhen CONFIG_SLUB_TINY is enabled, kfree_nolock() calls kasan_slab_free()\nbefore defer_free(). On ARM64 with MTE (Memory Tagging Extension),\nkasan_slab_free() poisons the memory and changes the tag from the\noriginal (e.g., 0xf3) to a poison tag (0xfe).\n\nWhen defer_free() then tries to write to the freed object to build the\ndeferred free list via llist_add(), the pointer still has the old tag,\ncausing a tag mismatch and triggering a KASAN use-after-free report:\n\n  BUG: KASAN: slab-use-after-free in defer_free+0x3c/0xbc mm/slub.c:6537\n  Write at addr f3f000000854f020 by task kworker/u8:6/983\n  Pointer tag: [f3], memory tag: [fe]\n\nFix this by calling kasan_reset_tag() before accessing the freed memory.\nThis is safe because defer_free() is part of the allocator itself and is\nexpected to manipulate freed memory for bookkeeping purposes."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/slub: restablecer la etiqueta KASAN en defer_free() antes de acceder a la memoria liberada\n\nCuando CONFIG_SLUB_TINY est\u00e1 habilitado, kfree_nolock() llama a kasan_slab_free() antes de defer_free(). En ARM64 con MTE (Extensi\u00f3n de Etiquetado de Memoria), kasan_slab_free() envenena la memoria y cambia la etiqueta de la original (p. ej., 0xf3) a una etiqueta de envenenamiento (0xfe).\n\nCuando defer_free() intenta escribir en el objeto liberado para construir la lista de liberaci\u00f3n diferida a trav\u00e9s de llist_add(), el puntero todav\u00eda tiene la etiqueta antigua, causando una falta de coincidencia de etiquetas y desencadenando un informe KASAN de uso despu\u00e9s de liberaci\u00f3n:\n\n  ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n de slab en defer_free+0x3c/0xbc mm/slub.c:6537\n  Escritura en la direcci\u00f3n f3f000000854f020 por la tarea kworker/u8:6/983\n  Etiqueta del puntero: [f3], etiqueta de memoria: [fe]\n\nSolucionar esto llamando a kasan_reset_tag() antes de acceder a la memoria liberada. Esto es seguro porque defer_free() es parte del propio asignador y se espera que manipule la memoria liberada para fines de contabilidad."
    }
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  "id": "CVE-2025-71110",
  "lastModified": "2026-03-25T19:27:53.777",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "impactScore": 5.9,
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          "lang": "en",
          "value": "CWE-416"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-71110 (GCVE-0-2025-71110)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-02-09 08:35

Title

mm/slub: reset KASAN tag in defer_free() before accessing freed memory

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/65d4e5af2a2e82f4f…
	https://git.kernel.org/stable/c/53ca00a19d345197a…

Impacted products

Vendor

Product

Version

Linux

Affected: af92793e52c3a99b828ed4bdd277fd3e11c18d08 , < 65d4e5af2a2e82f4fc50d8259aee208fbc6b2c1d (git)
Affected: af92793e52c3a99b828ed4bdd277fd3e11c18d08 , < 53ca00a19d345197a37a1bf552e8d1e7b091666c (git)

Linux

Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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Sightings

Author	Source	Type	Date	Other

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-2025-71110

CVE-2025-71110 (GCVE-0-2025-71110)

Tags

Sightings

Nomenclature