CVE-2024-36892 (GCVE-0-2024-36892)

Vulnerability from cvelistv5 – Published: 2024-05-30 15:28 – Updated: 2026-05-11 20:16
VLAI
Title
mm/slub: avoid zeroing outside-object freepointer for single free
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid zeroing outside-object freepointer for single free Commit 284f17ac13fe ("mm/slub: handle bulk and single object freeing separately") splits single and bulk object freeing in two functions slab_free() and slab_free_bulk() which leads slab_free() to call slab_free_hook() directly instead of slab_free_freelist_hook(). If `init_on_free` is set, slab_free_hook() zeroes the object. Afterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are set, the do_slab_free() slowpath executes freelist consistency checks and try to decode a zeroed freepointer which leads to a "Freepointer corrupt" detection in check_object(). During bulk free, slab_free_freelist_hook() isn't affected as it always sets it objects freepointer using set_freepointer() to maintain its reconstructed freelist after `init_on_free`. For single free, object's freepointer thus needs to be avoided when stored outside the object if `init_on_free` is set. The freepointer left as is, check_object() may later detect an invalid pointer value due to objects overflow. To reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the command line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`. dmesg sample log: [ 10.708715] ============================================================================= [ 10.710323] BUG kmalloc-rnd-05-32 (Tainted: G B T ): Freepointer corrupt [ 10.712695] ----------------------------------------------------------------------------- [ 10.712695] [ 10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Object ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Padding ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-10 18:49 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 284f17ac13fe34ae9eecbe57bb91553374d9b855 , < 56900355485f6e82114b18c812edd57fd7970dcb (git)
Affected: 284f17ac13fe34ae9eecbe57bb91553374d9b855 , < 8f828aa48812ced28aa39cb3cfe55ef2444d03dd (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.8.10 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid zeroing outside-object freepointer for single free\n\nCommit 284f17ac13fe (\"mm/slub: handle bulk and single object freeing\nseparately\") splits single and bulk object freeing in two functions\nslab_free() and slab_free_bulk() which leads slab_free() to call\nslab_free_hook() directly instead of slab_free_freelist_hook().\n\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\nset, the do_slab_free() slowpath executes freelist consistency\nchecks and try to decode a zeroed freepointer which leads to a\n\"Freepointer corrupt\" detection in check_object().\n\nDuring bulk free, slab_free_freelist_hook() isn\u0027t affected as it always\nsets it objects freepointer using set_freepointer() to maintain its\nreconstructed freelist after `init_on_free`.\n\nFor single free, object\u0027s freepointer thus needs to be avoided when\nstored outside the object if `init_on_free` is set. The freepointer left\nas is, check_object() may later detect an invalid pointer value due to\nobjects overflow.\n\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\n\ndmesg sample log:\n[   10.708715] =============================================================================\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\n[   10.712695] -----------------------------------------------------------------------------\n[   10.712695]\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\n[   10.716698]\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed"
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          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/slub: evita poner a cero el puntero libre de objetos externos para un solo commit libre 284f17ac13fe (\"mm/slub: maneja la liberaci\u00f3n masiva y de objetos individuales por separado\") divide la liberaci\u00f3n de objetos \u00fanicos y masivos en dos funciones slab_free() y slab_free_bulk() lo que lleva a slab_free() a llamar a slab_free_hook() directamente en lugar de slab_free_freelist_hook(). Si se establece `init_on_free`, slab_free_hook() pone a cero el objeto. Luego, si se configuran `slub_debug=F` y `CONFIG_SLAB_FREELIST_HARDENED`, la ruta lenta do_slab_free() ejecuta comprobaciones de coherencia de la lista libre e intenta decodificar un freepointer puesto a cero, lo que conduce a una detecci\u00f3n de \"Freepointer corrupto\" en check_object(). Durante la liberaci\u00f3n masiva, slab_free_freelist_hook() no se ve afectado ya que siempre establece el puntero libre de sus objetos usando set_freepointer() para mantener su lista libre reconstruida despu\u00e9s de `init_on_free`. Para un solo libre, el puntero libre del objeto debe evitarse cuando se almacena fuera del objeto si est\u00e1 configurado \"init_on_free\". El puntero libre se deja como est\u00e1, check_object() puede detectar m\u00e1s adelante un valor de puntero no v\u00e1lido debido a un desbordamiento de objetos. Para reproducir, configure `slub_debug=FU init_on_free=1 log_level=7` en la l\u00ednea de comando de una compilaci\u00f3n del kernel con `CONFIG_SLAB_FREELIST_HARDENED=y`. Registro de muestra de dmesg: [10.708715] ============================================ ================================== [10.710323] ERROR kmalloc-rnd-05-32 (Contaminado: GBT) : Freepointer corrupto [10.712695] -------------------------------------------- --------------------------------- [ 10.712695] [ 10.712695] Losa 0xffffd8bdc400d580 objetos=32 usados=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Objeto 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Objeto ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........ [ 10.720703] Objeto ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696 ] FIX kmalloc-rnd-05-32: Objeto en 0xffff9d9a80356600 no liberado"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid zeroing outside-object freepointer for single free\n\nCommit 284f17ac13fe (\"mm/slub: handle bulk and single object freeing\nseparately\") splits single and bulk object freeing in two functions\nslab_free() and slab_free_bulk() which leads slab_free() to call\nslab_free_hook() directly instead of slab_free_freelist_hook().\n\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\nset, the do_slab_free() slowpath executes freelist consistency\nchecks and try to decode a zeroed freepointer which leads to a\n\"Freepointer corrupt\" detection in check_object().\n\nDuring bulk free, slab_free_freelist_hook() isn\u0027t affected as it always\nsets it objects freepointer using set_freepointer() to maintain its\nreconstructed freelist after `init_on_free`.\n\nFor single free, object\u0027s freepointer thus needs to be avoided when\nstored outside the object if `init_on_free` is set. The freepointer left\nas is, check_object() may later detect an invalid pointer value due to\nobjects overflow.\n\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\n\ndmesg sample log:\n[   10.708715] =============================================================================\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\n[   10.712695] -----------------------------------------------------------------------------\n[   10.712695]\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\n[   10.716698]\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/slub: evita poner a cero el puntero libre de objetos externos para un solo commit libre 284f17ac13fe (\"mm/slub: maneja la liberaci\u00f3n masiva y de objetos individuales por separado\") divide la liberaci\u00f3n de objetos \u00fanicos y masivos en dos funciones slab_free() y slab_free_bulk() lo que lleva a slab_free() a llamar a slab_free_hook() directamente en lugar de slab_free_freelist_hook(). Si se establece `init_on_free`, slab_free_hook() pone a cero el objeto. Luego, si se configuran `slub_debug=F` y `CONFIG_SLAB_FREELIST_HARDENED`, la ruta lenta do_slab_free() ejecuta comprobaciones de coherencia de la lista libre e intenta decodificar un freepointer puesto a cero, lo que conduce a una detecci\u00f3n de \"Freepointer corrupto\" en check_object(). Durante la liberaci\u00f3n masiva, slab_free_freelist_hook() no se ve afectado ya que siempre establece el puntero libre de sus objetos usando set_freepointer() para mantener su lista libre reconstruida despu\u00e9s de `init_on_free`. Para un solo libre, el puntero libre del objeto debe evitarse cuando se almacena fuera del objeto si est\u00e1 configurado \"init_on_free\". El puntero libre se deja como est\u00e1, check_object() puede detectar m\u00e1s adelante un valor de puntero no v\u00e1lido debido a un desbordamiento de objetos. Para reproducir, configure `slub_debug=FU init_on_free=1 log_level=7` en la l\u00ednea de comando de una compilaci\u00f3n del kernel con `CONFIG_SLAB_FREELIST_HARDENED=y`. Registro de muestra de dmesg: [10.708715] ============================================ ================================== [10.710323] ERROR kmalloc-rnd-05-32 (Contaminado: GBT) : Freepointer corrupto [10.712695] -------------------------------------------- --------------------------------- [ 10.712695] [ 10.712695] Losa 0xffffd8bdc400d580 objetos=32 usados=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [ 10.716698] Objeto 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [ 10.716698] [ 10.716698] Bytes b4 9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.720703] Objeto ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........ [ 10.720703] Objeto ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ [ 10.724696] Relleno ffff9d9a8035667c: 00 00 00 00 .... [ 10.724696 ] FIX kmalloc-rnd-05-32: Objeto en 0xffff9d9a80356600 no liberado"
          }
        ],
        "id": "CVE-2024-36892",
        "lastModified": "2026-06-17T07:37:17.387",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
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              "source": "nvd@nist.gov",
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                "version": "2.0.3"
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        "published": "2024-05-30T16:15:12.680",
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        "vulnStatus": "Analyzed",
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                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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      "current_release_date": "2025-11-21T11:02:21+00:00",
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      "initial_release_date": "2024-05-30T00:00:00+00:00",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/slub: avoid zeroing outside-object freepointer for single free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-36892.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:55:14Z",
      "cve": "CVE-2024-36892",
      "id": "CVE-2024-36892",
      "initial_release_date": "2024-06-01T02:23:44Z",
      "product_status:known_not_affected": "385",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-36892",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-36892.json",
      "version": "19"
    },
    "vulnrichment": {
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              "dateUpdated": "2024-08-02T03:43:49.159Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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                "url": "https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd"
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            "title": "CVE Program Container"
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            "metrics": [
              {
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                  "content": {
                    "id": "CVE-2024-36892",
                    "options": [
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        "cna": {
          "affected": [
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              "product": "Linux",
              "programFiles": [
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid zeroing outside-object freepointer for single free\n\nCommit 284f17ac13fe (\"mm/slub: handle bulk and single object freeing\nseparately\") splits single and bulk object freeing in two functions\nslab_free() and slab_free_bulk() which leads slab_free() to call\nslab_free_hook() directly instead of slab_free_freelist_hook().\n\nIf `init_on_free` is set, slab_free_hook() zeroes the object.\nAfterward, if `slub_debug=F` and `CONFIG_SLAB_FREELIST_HARDENED` are\nset, the do_slab_free() slowpath executes freelist consistency\nchecks and try to decode a zeroed freepointer which leads to a\n\"Freepointer corrupt\" detection in check_object().\n\nDuring bulk free, slab_free_freelist_hook() isn\u0027t affected as it always\nsets it objects freepointer using set_freepointer() to maintain its\nreconstructed freelist after `init_on_free`.\n\nFor single free, object\u0027s freepointer thus needs to be avoided when\nstored outside the object if `init_on_free` is set. The freepointer left\nas is, check_object() may later detect an invalid pointer value due to\nobjects overflow.\n\nTo reproduce, set `slub_debug=FU init_on_free=1 log_level=7` on the\ncommand line of a kernel build with `CONFIG_SLAB_FREELIST_HARDENED=y`.\n\ndmesg sample log:\n[   10.708715] =============================================================================\n[   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt\n[   10.712695] -----------------------------------------------------------------------------\n[   10.712695]\n[   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2)\n[   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c\n[   10.716698]\n[   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n[   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      ....\n[   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed"
            }
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            "dateUpdated": "2024-05-30T15:28:58.528Z",
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            {
              "url": "https://git.kernel.org/stable/c/8f828aa48812ced28aa39cb3cfe55ef2444d03dd"
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          "x_generator": {
            "engine": "bippy-a5840b7849dd"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2024-36892",
        "datePublished": "2024-05-30T15:28:58.528Z",
        "dateReserved": "2024-05-30T15:25:07.065Z",
        "dateUpdated": "2024-08-02T03:43:49.159Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.



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