CVE-2026-74673 (GCVE-0-2026-74673)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:23
VLAI
Title
Input: evdev - fix information leak in evdev_pass_values()
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: evdev - fix information leak in evdev_pass_values() In evdev_pass_values(), the input_event structure is allocated on the kernel stack and populated field-by-field. However, it is never fully initialized. On architectures where struct input_event contains explicit or implicit padding (such as the 32-bit __pad field on SPARC64), these padding bytes are left uninitialized. When this event structure is subsequently passed to the client buffer and later copied to userspace, the uninitialized padding bytes leak kernel stack memory, potentially exposing sensitive information. Similar issues exist in __evdev_queue_syn_dropped and __pass_event. Fix this by explicitly zeroing the entire event structure with memset() before populating its fields. This ensures all padding bytes are cleared before the data crosses the security boundary.
Severity
No CVSS data available.
Impacted products
Vendor Product Version
Linux Linux Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < d2e3839419ac4047835762c4d7712bda1101b57e (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < c6d5fa46c1ee25d068fc730fd377f0f54188d290 (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < e748811d9b80a3e101110ff4b3c612e5fca54d98 (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < 06a286b320236508d02ab2ccc9496352748652a8 (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < 7d17e9454a9af3ec7aebb88b41a9deedd5b19a6b (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < bd3c4108a56de34380edab670065e86283cb3029 (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < 7e55ca1080f09d9f7112c7f20ac31f682c1f2374 (git)
Affected: 6addb1d6de1968b84852f54561cc9a999909b5a9 , < 90f305f2c7a30257c683e13f4bf7c798eea992a0 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.24
Unaffected: 0 , < 2.6.24 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: evdev - fix information leak in evdev_pass_values()\n\nIn evdev_pass_values(), the input_event structure is allocated on the\nkernel stack and populated field-by-field. However, it is never fully\ninitialized. On architectures where struct input_event contains explicit\nor implicit padding (such as the 32-bit __pad field on SPARC64), these\npadding bytes are left uninitialized.\n\nWhen this event structure is subsequently passed to the client buffer\nand later copied to userspace, the uninitialized padding bytes leak\nkernel stack memory, potentially exposing sensitive information.\n\nSimilar issues exist in __evdev_queue_syn_dropped and __pass_event.\n\nFix this by explicitly zeroing the entire event structure with memset()\nbefore populating its fields. This ensures all padding bytes are cleared\nbefore the data crosses the security boundary."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-74673",
    "datePublished": "2026-08-22T15:32:42.941Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
    "dateUpdated": "2026-08-25T05:23:15.607Z",
    "state": "PUBLISHED"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: evdev - fix information leak in evdev_pass_values()\n\nIn evdev_pass_values(), the input_event structure is allocated on the\nkernel stack and populated field-by-field. However, it is never fully\ninitialized. On architectures where struct input_event contains explicit\nor implicit padding (such as the 32-bit __pad field on SPARC64), these\npadding bytes are left uninitialized.\n\nWhen this event structure is subsequently passed to the client buffer\nand later copied to userspace, the uninitialized padding bytes leak\nkernel stack memory, potentially exposing sensitive information.\n\nSimilar issues exist in __evdev_queue_syn_dropped and __pass_event.\n\nFix this by explicitly zeroing the entire event structure with memset()\nbefore populating its fields. This ensures all padding bytes are cleared\nbefore the data crosses the security boundary."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nInput: evdev - corrige fuga de informaci\u00f3n en evdev_pass_values()\n\nEn evdev_pass_values(), la estructura input_event se asigna en la pila del kernel y se rellena campo por campo. Sin embargo, nunca se inicializa completamente. En arquitecturas donde la estructura input_event contiene relleno expl\u00edcito o impl\u00edcito (como el campo __pad de 32 bits en SPARC64), estos bytes de relleno se dejan sin inicializar.\n\nCuando esta estructura de evento se pasa posteriormente al b\u00fafer del cliente y luego se copia al espacio de usuario, los bytes de relleno sin inicializar fugan memoria de la pila del kernel, exponiendo potencialmente informaci\u00f3n sensible.\n\nProblemas similares existen en __evdev_queue_syn_dropped y __pass_event.\n\nSolucione esto poniendo a cero expl\u00edcitamente toda la estructura de evento con memset() antes de rellenar sus campos. Esto asegura que todos los bytes de relleno se borren antes de que los datos crucen el l\u00edmite de seguridad."
          }
        ],
        "id": "CVE-2026-74673",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2026-08-22T16:16:41.347",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T11:12:31+00:00",
      "cve": "CVE-2026-74673",
      "id": "CVE-2026-74673",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: evdev - fix information leak in evdev_pass_values()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74673.json",
      "version": "3"
    }
  }
}



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