CVE-2025-38424 (GCVE-0-2025-38424)
Vulnerability from cvelistv5
Published
2025-07-25 14:16
Modified
2025-07-28 04:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Fix sample vs do_exit() Baisheng Gao reported an ARM64 crash, which Mark decoded as being a synchronous external abort -- most likely due to trying to access MMIO in bad ways. The crash further shows perf trying to do a user stack sample while in exit_mmap()'s tlb_finish_mmu() -- i.e. while tearing down the address space it is trying to access. It turns out that we stop perf after we tear down the userspace mm; a receipie for disaster, since perf likes to access userspace for various reasons. Flip this order by moving up where we stop perf in do_exit(). Additionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER to abort when the current task does not have an mm (exit_mm() makes sure to set current->mm = NULL; before commencing with the actual teardown). Such that CPU wide events don't trip on this same problem.
References
Impacted products
Vendor Product Version
Linux Linux Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
Version: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c",
            "kernel/exit.c"
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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\nperf: Fix sample vs do_exit()\n\nBaisheng Gao reported an ARM64 crash, which Mark decoded as being a\nsynchronous external abort -- most likely due to trying to access\nMMIO in bad ways.\n\nThe crash further shows perf trying to do a user stack sample while in\nexit_mmap()\u0027s tlb_finish_mmu() -- i.e. while tearing down the address\nspace it is trying to access.\n\nIt turns out that we stop perf after we tear down the userspace mm; a\nreceipie for disaster, since perf likes to access userspace for\nvarious reasons.\n\nFlip this order by moving up where we stop perf in do_exit().\n\nAdditionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER\nto abort when the current task does not have an mm (exit_mm() makes\nsure to set current-\u003emm = NULL; before commencing with the actual\nteardown). Such that CPU wide events don\u0027t trip on this same problem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:21:47.788Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e"
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        {
          "url": "https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386"
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        {
          "url": "https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f"
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          "url": "https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b"
        },
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          "url": "https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54"
        },
        {
          "url": "https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39"
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      ],
      "title": "perf: Fix sample vs do_exit()",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38424",
    "datePublished": "2025-07-25T14:16:44.846Z",
    "dateReserved": "2025-04-16T04:51:24.014Z",
    "dateUpdated": "2025-07-28T04:21:47.788Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38424\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T15:15:27.260\",\"lastModified\":\"2025-07-25T15:29:19.837\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nperf: Fix sample vs do_exit()\\n\\nBaisheng Gao reported an ARM64 crash, which Mark decoded as being a\\nsynchronous external abort -- most likely due to trying to access\\nMMIO in bad ways.\\n\\nThe crash further shows perf trying to do a user stack sample while in\\nexit_mmap()\u0027s tlb_finish_mmu() -- i.e. while tearing down the address\\nspace it is trying to access.\\n\\nIt turns out that we stop perf after we tear down the userspace mm; a\\nreceipie for disaster, since perf likes to access userspace for\\nvarious reasons.\\n\\nFlip this order by moving up where we stop perf in do_exit().\\n\\nAdditionally, harden PERF_SAMPLE_CALLCHAIN and PERF_SAMPLE_STACK_USER\\nto abort when the current task does not have an mm (exit_mm() makes\\nsure to set current-\u003emm = NULL; before commencing with the actual\\nteardown). Such that CPU wide events don\u0027t trip on this same problem.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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