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CVE-2024-35853

Estado: AnalizadaMedia (6.4)—
Detalles técnicos trazas, registros y código del informe original
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mlxsw: spectrum_acl_tcam: corrige la pérdida de memoria durante el rehash El trabajo retrasado del rehash migra los filtros de una región a otra. Esto se hace iterando sobre todos los fragmentos (todos los filtros con la misma prioridad) en la región y en cada fragmento iterando sobre todos los filtros. Si la migración fallo, el código intenta migrar los filtros nuevamente a la región anterior. Sin embargo, la reversión en sí también puede fallor, en cuyo caso se realizará otra migración por error. Además de que este ping pong no es una muy buena idea, también crea un problema. Cada fragmento virtual hace referencia a dos fragmentos: el que se utiliza actualmente ('vchunk->chunk') y una copia de seguridad ('vchunk->chunk2'). Durante la migración, el primero contiene el fragmento al que queremos migrar los filtros y el segundo contiene el fragmento desde el que estamos migrando los filtros. Actualmente, el código supone, pero no verifica, que el fragmento de copia de seguridad no existe (NULL) si el fragmento utilizado actualmente no hace referencia a la región de destino. Esta suposición se rompe cuando intentamos revertir una reversión, lo que provoca que el fragmento de copia de seguridad se sobrescriba y se filtre [1]. Corrija al no revertir una reversión fallida y agregue una advertencia para evitar casos futuros. [1] ADVERTENCIA: CPU: 5 PID: 1063 en lib/parman.c:291 parman_destroy+0x17/0x20 Módulos vinculados en: CPU: 5 PID: 1063 Comm: kworker/5:11 Tainted: GW 6.9.0-rc2- custom-00784-gc6a05c468a0b #14 Nombre del hardware: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 06/01/2019 Cola de trabajo: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP: 0010:parman_destroy+0x17/0x20 [...] :  mlxsw_sp_acl_atcam_region_fini +0x19/0x60 mlxsw_sp_acl_tcam_region_destroy+0x49/0xf0 mlxsw_sp_acl_tcam_vregion_rehash_work+0x1f1/0x470 proceso_one_work+0x151/0x370 trabajador_hilo+0x2cb/0x3e0 kthread+0xd0/0x100 k+0x34/0x50 ret_from_fork_asm+0x1a/0x30

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2024-35853",
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
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              "automatable": "no"
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          "timestamp": "2024-05-20T17:34:35.252109Z"
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-401"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_acl_tcam: Fix memory leak during rehash\n\nThe rehash delayed work migrates filters from one region to another.\nThis is done by iterating over all chunks (all the filters with the same\npriority) in the region and in each chunk iterating over all the\nfilters.\n\nIf the migration fails, the code tries to migrate the filters back to\nthe old region. However, the rollback itself can also fail in which case\nanother migration will be erroneously performed. Besides the fact that\nthis ping pong is not a very good idea, it also creates a problem.\n\nEach virtual chunk references two chunks: The currently used one\n('vchunk->chunk') and a backup ('vchunk->chunk2'). During migration the\nfirst holds the chunk we want to migrate filters to and the second holds\nthe chunk we are migrating filters from.\n\nThe code currently assumes - but does not verify - that the backup chunk\ndoes not exist (NULL) if the currently used chunk does not reference the\ntarget region. This assumption breaks when we are trying to rollback a\nrollback, resulting in the backup chunk being overwritten and leaked\n[1].\n\nFix by not rolling back a failed rollback and add a warning to avoid\nfuture cases.\n\n[1]\nWARNING: CPU: 5 PID: 1063 at lib/parman.c:291 parman_destroy+0x17/0x20\nModules linked in:\nCPU: 5 PID: 1063 Comm: kworker/5:11 Tainted: G        W          6.9.0-rc2-custom-00784-gc6a05c468a0b #14\nHardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019\nWorkqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work\nRIP: 0010:parman_destroy+0x17/0x20\n[...]\nCall Trace:\n <TASK>\n mlxsw_sp_acl_atcam_region_fini+0x19/0x60\n mlxsw_sp_acl_tcam_region_destroy+0x49/0xf0\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x1f1/0x470\n process_one_work+0x151/0x370\n worker_thread+0x2cb/0x3e0\n kthread+0xd0/0x100\n ret_from_fork+0x34/0x50\n ret_from_fork_asm+0x1a/0x30\n </TASK>"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mlxsw: spectrum_acl_tcam: corrige la pérdida de memoria durante el rehash El trabajo retrasado del rehash migra los filtros de una región a otra. Esto se hace iterando sobre todos los fragmentos (todos los filtros con la misma prioridad) en la región y en cada fragmento iterando sobre todos los filtros. Si la migración fallo, el código intenta migrar los filtros nuevamente a la región anterior. Sin embargo, la reversión en sí también puede fallor, en cuyo caso se realizará otra migración por error. Además de que este ping pong no es una muy buena idea, también crea un problema. Cada fragmento virtual hace referencia a dos fragmentos: el que se utiliza actualmente ('vchunk-&gt;chunk') y una copia de seguridad ('vchunk-&gt;chunk2'). Durante la migración, el primero contiene el fragmento al que queremos migrar los filtros y el segundo contiene el fragmento desde el que estamos migrando los filtros. Actualmente, el código supone, pero no verifica, que el fragmento de copia de seguridad no existe (NULL) si el fragmento utilizado actualmente no hace referencia a la región de destino. Esta suposición se rompe cuando intentamos revertir una reversión, lo que provoca que el fragmento de copia de seguridad se sobrescriba y se filtre [1]. Corrija al no revertir una reversión fallida y agregue una advertencia para evitar casos futuros. [1] ADVERTENCIA: CPU: 5 PID: 1063 en lib/parman.c:291 parman_destroy+0x17/0x20 Módulos vinculados en: CPU: 5 PID: 1063 Comm: kworker/5:11 Tainted: GW 6.9.0-rc2- custom-00784-gc6a05c468a0b #14 Nombre del hardware: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 06/01/2019 Cola de trabajo: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP: 0010:parman_destroy+0x17/0x20 [...] :  mlxsw_sp_acl_atcam_region_fini +0x19/0x60 mlxsw_sp_acl_tcam_region_destroy+0x49/0xf0 mlxsw_sp_acl_tcam_vregion_rehash_work+0x1f1/0x470 proceso_one_work+0x151/0x370 trabajador_hilo+0x2cb/0x3e0 kthread+0xd0/0x100 k+0x34/0x50 ret_from_fork_asm+0x1a/0x30 "
    }
  ],
  "lastModified": "2026-06-17T07:35:33.590",
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