perf: Fix sample vs do_exit()

{
  "id": "5baa0821dcefb9ccaa0982cf76c94aa9563bbda3b081f63c3aea569f8b3156ed",
  "url": "https://osv.dev/vulnerability/CVE-2025-38424",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "perf: Fix sample vs do_exit()",
    "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.",
    "evidence": "osv:CVE-2025-38424",
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      "id": "CVE-2025-38424",
      "aliases": [
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      "modified": "2026-10-28T02:30:50.378732289Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2ee6044a693735396bb47eeaba1ac3ae26c1c99b",
        "https://git.kernel.org/stable/c/456019adaa2f5366b89c868dea9b483179bece54",
        "https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39",
        "https://git.kernel.org/stable/c/507c9a595bad3abd107c6a8857d7fd125d89f386",
        "https://git.kernel.org/stable/c/7311970d07c4606362081250da95f2c7901fc0db",
        "https://git.kernel.org/stable/c/7b8f3c72175c6a63a95cf2e219f8b78e2baad34e",
        "https://git.kernel.org/stable/c/975ffddfa2e19823c719459d2364fcaa17673964",
        "https://git.kernel.org/stable/c/a9f6aab7910a0ef2895797f15c947f6d1053160f",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38424.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38424",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38424.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38424",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518691,
  "published_at": "2025-07-25T14:16:44.846+00:00"
}