Vulnerability-Lookup

OESA-2025-1962 (CVE-2025-38424)

Vulnerability from osv_openeuler – Published: 2025-08-08 11:09 – Updated: 2026-08-06 11:09 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

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.(CVE-2025-38424)

Severity

7.0 (High)


                    
                      CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-38424	ADVISORY

JSON

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{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bpftool-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "bpftool-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-debugsource-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-devel-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-source-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-tools-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-tools-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "kernel-tools-devel-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "perf-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "python2-perf-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "python2-perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "python3-perf-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm",
          "python3-perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "kernel-4.19.90-2507.5.0.0338.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "bpftool-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "bpftool-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-debugsource-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-devel-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-source-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-tools-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-tools-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "kernel-tools-devel-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "perf-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "python2-perf-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "python2-perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "python3-perf-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm",
          "python3-perf-debuginfo-4.19.90-2507.5.0.0338.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.19.90-2507.5.0.0338.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\n\nIn 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()\u0026apos;s 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-\u0026gt;mm = NULL; before commencing with the actual\nteardown). Such that CPU wide events don\u0026apos;t trip on this same problem.(CVE-2025-38424)",
  "id": "OESA-2025-1962",
  "modified": "2026-08-06T11:09:02Z",
  "published": "2025-08-08T11:09:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1962"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38424"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2025-38424"
  ]
}

CVE-2025-38424 (GCVE-0-2025-38424)

Vulnerability from cvelistv5 – Published: 2025-07-25 14:16 – Updated: 2026-08-05 12:01

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

10 references

URL	Tags
https://git.kernel.org/stable/c/7b8f3c72175c6a63a…
https://git.kernel.org/stable/c/507c9a595bad3abd1…
https://git.kernel.org/stable/c/a9f6aab7910a0ef28…
https://git.kernel.org/stable/c/975ffddfa2e19823c…
https://git.kernel.org/stable/c/2ee6044a693735396…
https://git.kernel.org/stable/c/456019adaa2f5366b…
https://git.kernel.org/stable/c/7311970d07c460636…
https://git.kernel.org/stable/c/4f6fc782128355931…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 7b8f3c72175c6a63a95cf2e219f8b78e2baad34e (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 507c9a595bad3abd107c6a8857d7fd125d89f386 (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < a9f6aab7910a0ef2895797f15c947f6d1053160f (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 975ffddfa2e19823c719459d2364fcaa17673964 (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 2ee6044a693735396bb47eeaba1ac3ae26c1c99b (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 456019adaa2f5366b89c868dea9b483179bece54 (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 7311970d07c4606362081250da95f2c7901fc0db (git) Affected: c5ebcedb566ef17bda7b02686e0d658a7bb42ee7 , < 4f6fc782128355931527cefe3eb45338abd8ab39 (git)
Linux	Linux	Affected: 3.7 Unaffected: 0 , < 3.7 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.95 , ≤ 6.6.* (semver) Unaffected: 6.12.35 , ≤ 6.12.* (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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        {
          "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": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through the `perf_event_open(2)` syscall creating a sampling event with `PERF_SAMPLE_STACK_USER`/`PERF_SAMPLE_CALLCHAIN`, plus a normal task exit. No network or physical component is involved.\nAC:L - The attacker controls both sides of the race \u2014 it creates the sampling event, chooses when the task calls `exit_group()`, and can widen the `exit_mmap()` window arbitrarily by mapping a large address space with many VMAs; failed attempts are free and can be repeated thousands of times per second via forked children with `attr.inherit=1`.\nPR:L - An ordinary unprivileged user can do this at the upstream default `perf_event_paranoid=2` \u2014 `PERF_SAMPLE_STACK_USER`/`PERF_SAMPLE_CALLCHAIN` have no capability gate, per-task events on one\u0027s own tasks need only `ptrace_may_access`, and `exclude_kernel=1` samples that skid into kernel mode are deliberately not dropped (revert 6a8a75f32357; `sample_is_allowed()` only guards `sigtrap`). On the widely deployed `perf_event_paranoid\u003c=1` systems it is fully deterministic with software clock events.\nUI:N - The attacker triggers everything from its own processes \u2014 open the event, exit the task. No victim action, no privileged profiler, and no administrator involvement is required.\nS:U - The unsafe access and its consequences are contained within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `__copy_from_user_inatomic()`/`__get_user()` read through an mm whose data pages and page-table pages have already been freed and can be reallocated, and the harvested bytes are written verbatim into the attacker-readable perf ring buffer \u2014 a use-after-free read that can disclose freed/reused memory or, via a walk through a recycled page-table page, effectively arbitrary physical memory.\nI:H - The use-after-free on the page tables makes the CPU issue accesses to attacker-groomable, arbitrary physical addresses; per UAF scoring guidance this is High, and it is concretely damaging because the reported case lands on MMIO, where reads carry side effects (read-to-clear status, FIFO pops) that corrupt device and system state.\nA:H - The reported failure is a fatal kernel abort \u2014 on arm64 `do_sea()` routes the synchronous external abort to `arm64_notify_die()` with `SIGKILL/SI_KERNEL`, which in kernel mode is an unrecoverable oops/panic; the attacker can trigger it repeatedly, giving a reliable full system DoS."
            }
          ]
        }
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        "dateUpdated": "2026-08-05T12:01:47.114Z",
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        {
          "url": "https://git.kernel.org/stable/c/4f6fc782128355931527cefe3eb45338abd8ab39"
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      "title": "perf: Fix sample vs do_exit()",
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    "datePublished": "2025-07-25T14:16:44.846Z",
    "dateReserved": "2025-04-16T04:51:24.014Z",
    "dateUpdated": "2026-08-05T12:01:47.114Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.