CVE-2023-53484 (GCVE-0-2023-53484)
Vulnerability from cvelistv5
Published
2025-10-01 11:42
Modified
2025-10-01 11:42
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: lib: cpu_rmap: Avoid use after free on rmap->obj array entries When calling irq_set_affinity_notifier() with NULL at the notify argument, it will cause freeing of the glue pointer in the corresponding array entry but will leave the pointer in the array. A subsequent call to free_irq_cpu_rmap() will try to free this entry again leading to possible use after free. Fix that by setting NULL to the array entry and checking that we have non-zero at the array entry when iterating over the array in free_irq_cpu_rmap(). The current code does not suffer from this since there are no cases where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the notify arg) is called, followed by a call to free_irq_cpu_rmap() so we don't hit and issue. Subsequent patches in this series excersize this flow, hence the required fix.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "product": "Linux",
          "programFiles": [
            "lib/cpu_rmap.c"
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          "vendor": "Linux",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: cpu_rmap: Avoid use after free on rmap-\u003eobj array entries\n\nWhen calling irq_set_affinity_notifier() with NULL at the notify\nargument, it will cause freeing of the glue pointer in the\ncorresponding array entry but will leave the pointer in the array. A\nsubsequent call to free_irq_cpu_rmap() will try to free this entry again\nleading to possible use after free.\n\nFix that by setting NULL to the array entry and checking that we have\nnon-zero at the array entry when iterating over the array in\nfree_irq_cpu_rmap().\n\nThe current code does not suffer from this since there are no cases\nwhere irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the\nnotify arg) is called, followed by a call to free_irq_cpu_rmap() so we\ndon\u0027t hit and issue. Subsequent patches in this series excersize this\nflow, hence the required fix."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:42:52.590Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/981f339d2905b6a92ef59358158b326493aecac5"
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          "url": "https://git.kernel.org/stable/c/d1308bd0b24cb1d78fa2747d5fa3e055cc628a48"
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        {
          "url": "https://git.kernel.org/stable/c/4e0473f1060aa49621d40a113afde24818101d37"
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      ],
      "title": "lib: cpu_rmap: Avoid use after free on rmap-\u003eobj array entries",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53484",
    "datePublished": "2025-10-01T11:42:52.590Z",
    "dateReserved": "2025-10-01T11:39:39.402Z",
    "dateUpdated": "2025-10-01T11:42:52.590Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53484\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:51.180\",\"lastModified\":\"2025-10-02T19:12:17.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlib: cpu_rmap: Avoid use after free on rmap-\u003eobj array entries\\n\\nWhen calling irq_set_affinity_notifier() with NULL at the notify\\nargument, it will cause freeing of the glue pointer in the\\ncorresponding array entry but will leave the pointer in the array. A\\nsubsequent call to free_irq_cpu_rmap() will try to free this entry again\\nleading to possible use after free.\\n\\nFix that by setting NULL to the array entry and checking that we have\\nnon-zero at the array entry when iterating over the array in\\nfree_irq_cpu_rmap().\\n\\nThe current code does not suffer from this since there are no cases\\nwhere irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the\\nnotify arg) is called, followed by a call to free_irq_cpu_rmap() so we\\ndon\u0027t hit and issue. Subsequent patches in this series excersize this\\nflow, hence the required fix.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4e0473f1060aa49621d40a113afde24818101d37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67bca5f1d644f4e79b694abd8052a177de81c37f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/981f339d2905b6a92ef59358158b326493aecac5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c6ed54dd90698dc0744d669524cc1c122ded8a16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1308bd0b24cb1d78fa2747d5fa3e055cc628a48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f748e15253833b771acbede14ea98f50831ac289\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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