{
  "cveId": "CVE-2021-46935",
  "url": "https://patchblox.com/security/cve/CVE-2021-46935",
  "summary": "CVE-2021-46935 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46935, released February 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  binder: fix async_free_space accounting for empt...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  binder: fix async_free_space accounting for empty parcels  In 4.13, commit 74310e06be4d (\u0022android: binder: Move buffer out of area shared with user space\u0022) fixed a kernel structure visibility issue. As part of that patch, sizeof(void *) was used as the buffer size for 0-length data payloads so the driver could detect abusive clients sending 0-length asynchronous transactions to a server by enforcing limits on async_free_size.  Unfortunately, on the \u0022free\u0022 side, the accounting of async_free_space did not add the sizeof(void *) back. The result was that up to 8-bytes of async_free_space were leaked on every async transaction of 8-bytes or less.  These small transactions are uncommon, so this accounting issue has gone undetected for several years.  The fix is to use \u0022buffer_size\u0022 (the allocated buffer size) instead of \u0022size\u0022 (the logical buffer size) when updating the async_free_space during the free operation. These are the same except for this corner case of asynchronous transactions with payloads \u003C 8 bytes.",
  "published": "2024-02-27T10:15:07Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
  "epss": 0.00229,
  "epssPercentile": 0.13794,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-46935",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46935",
      "released": "2024-02-27T10:15:07Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-46935",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46935",
      "released": "2024-02-27T10:15:07Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-46935",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-46935",
      "released": "2024-02-27T10:15:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}