GHSA-WHRV-V478-PW4Q

Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2025-11-03 18:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

parisc: Revise gateway LWS calls to probe user read access

We use load and stbys,e instructions to trigger memory reference interruptions without writing to memory. Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel and gateway page execute at privilege level 0, so this code never triggers a read access interruption. Thus, it is currently possible for user code to execute a LWS compare and swap operation at an address that is read protected at privilege level 3 (PRIV_USER).

Fix this by probing read access rights at privilege level 3 and branching to lws_fault if access isn't allowed.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39715"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-05T18:15:48Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Revise gateway LWS calls to probe user read access\n\nWe use load and stbys,e instructions to trigger memory reference\ninterruptions without writing to memory. Because of the way read\naccess support is implemented, read access interruptions are only\ntriggered at privilege levels 2 and 3. The kernel and gateway\npage execute at privilege level 0, so this code never triggers\na read access interruption. Thus, it is currently possible for\nuser code to execute a LWS compare and swap operation at an\naddress that is read protected at privilege level 3 (PRIV_USER).\n\nFix this by probing read access rights at privilege level 3 and\nbranching to lws_fault if access isn\u0027t allowed.",
  "id": "GHSA-whrv-v478-pw4q",
  "modified": "2025-11-03T18:31:39Z",
  "published": "2025-09-05T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39715"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bccf47adbf658293528e86960e6d6f736b1c9f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b6af875baba9c4679b55f4561e201485451305f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc0a24c24ceebabb5ba65900e332233d79e625e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8b496c52aa0c6572d88db7cab85aeea6f9c194d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6334f4ae9a4e962ba74b026e1d965dfdf8cbef8"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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