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.
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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    "datePublished": "2026-08-22T15:32:42.941Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
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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. 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    "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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.