CVE-2025-39716 (GCVE-0-2025-39716)
Vulnerability from cvelistv5
Published
2025-09-05 17:21
Modified
2025-09-29 05:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: parisc: Revise __get_user() to probe user read access Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel executes at privilege level 0, so __get_user() never triggers a read access interruption (code 26). Thus, it is currently possible for user code to access a read protected address via a system call. Fix this by probing read access rights at privilege level 3 (PRIV_USER) and setting __gu_err to -EFAULT (-14) if access isn't allowed. Note the cmpiclr instruction does a 32-bit compare because COND macro doesn't work inside asm.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "product": "Linux",
          "programFiles": [
            "arch/parisc/include/asm/uaccess.h"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Revise __get_user() to probe user read access\n\nBecause of the way read access support is implemented, read access\ninterruptions are only triggered at privilege levels 2 and 3. The\nkernel executes at privilege level 0, so __get_user() never triggers\na read access interruption (code 26). Thus, it is currently possible\nfor user code to access a read protected address via a system call.\n\nFix this by probing read access rights at privilege level 3 (PRIV_USER)\nand setting __gu_err to -EFAULT (-14) if access isn\u0027t allowed.\n\nNote the cmpiclr instruction does a 32-bit compare because COND macro\ndoesn\u0027t work inside asm."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:58:01.681Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4c981077255acc2ed5b3df6e8dd0125c81b626a9"
        },
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        },
        {
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        {
          "url": "https://git.kernel.org/stable/c/89f686a0fb6e473a876a9a60a13aec67a62b9a7e"
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      ],
      "title": "parisc: Revise __get_user() to probe user read access",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39716",
    "datePublished": "2025-09-05T17:21:23.429Z",
    "dateReserved": "2025-04-16T07:20:57.117Z",
    "dateUpdated": "2025-09-29T05:58:01.681Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39716\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:49.123\",\"lastModified\":\"2025-09-08T16:25:38.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nparisc: Revise __get_user() to probe user read access\\n\\nBecause of the way read access support is implemented, read access\\ninterruptions are only triggered at privilege levels 2 and 3. The\\nkernel executes at privilege level 0, so __get_user() never triggers\\na read access interruption (code 26). Thus, it is currently possible\\nfor user code to access a read protected address via a system call.\\n\\nFix this by probing read access rights at privilege level 3 (PRIV_USER)\\nand setting __gu_err to -EFAULT (-14) if access isn\u0027t allowed.\\n\\nNote the cmpiclr instruction does a 32-bit compare because COND macro\\ndoesn\u0027t work inside asm.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/28a9b71671fb4a2993ef85b8ef6f117ea63894fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c981077255acc2ed5b3df6e8dd0125c81b626a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/741b163e440683195b8fd4fc8495fcd0105c6ab7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89f686a0fb6e473a876a9a60a13aec67a62b9a7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f410ef9a032caf98117256b22139c31342d7bb06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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