CVE-2025-39694 (GCVE-0-2025-39694)
Vulnerability from cvelistv5
Published
2025-09-05 17:21
Modified
2025-09-29 05:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/sclp: Fix SCCB present check Tracing code called by the SCLP interrupt handler contains early exits if the SCCB address associated with an interrupt is NULL. This check is performed after physical to virtual address translation. If the kernel identity mapping does not start at address zero, the resulting virtual address is never zero, so that the NULL checks won't work. Subsequently this may result in incorrect accesses to the first page of the identity mapping. Fix this by introducing a function that handles the NULL case before address translation.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b
Impacted products
Vendor Product Version
Linux Linux Version: ada1da31ce34248bc97ca8f801f2cf6efa378a81
Version: ada1da31ce34248bc97ca8f801f2cf6efa378a81
Version: ada1da31ce34248bc97ca8f801f2cf6efa378a81
Version: ada1da31ce34248bc97ca8f801f2cf6efa378a81
Version: ada1da31ce34248bc97ca8f801f2cf6efa378a81
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   Linux Linux Version: 5.16
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/char/sclp.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "5.16"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
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              "version": "6.1.149",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.16.4",
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              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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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\ns390/sclp: Fix SCCB present check\n\nTracing code called by the SCLP interrupt handler contains early exits\nif the SCCB address associated with an interrupt is NULL. This check is\nperformed after physical to virtual address translation.\n\nIf the kernel identity mapping does not start at address zero, the\nresulting virtual address is never zero, so that the NULL checks won\u0027t\nwork. Subsequently this may result in incorrect accesses to the first\npage of the identity mapping.\n\nFix this by introducing a function that handles the NULL case before\naddress translation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:57:33.748Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7"
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        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a"
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      ],
      "title": "s390/sclp: Fix SCCB present check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39694",
    "datePublished": "2025-09-05T17:21:00.361Z",
    "dateReserved": "2025-04-16T07:20:57.114Z",
    "dateUpdated": "2025-09-29T05:57:33.748Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39694\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-05T18:15:46.247\",\"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\\ns390/sclp: Fix SCCB present check\\n\\nTracing code called by the SCLP interrupt handler contains early exits\\nif the SCCB address associated with an interrupt is NULL. This check is\\nperformed after physical to virtual address translation.\\n\\nIf the kernel identity mapping does not start at address zero, the\\nresulting virtual address is never zero, so that the NULL checks won\u0027t\\nwork. Subsequently this may result in incorrect accesses to the first\\npage of the identity mapping.\\n\\nFix this by introducing a function that handles the NULL case before\\naddress translation.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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