CVE-2025-38696 (GCVE-0-2025-38696)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:32 – Updated: 2026-05-23 16:00
VLAI
Title
MIPS: Don't crash in stack_top() for tasks without ABI or vDSO
Summary
In the Linux kernel, the following vulnerability has been resolved: MIPS: Don't crash in stack_top() for tasks without ABI or vDSO Not all tasks have an ABI associated or vDSO mapped, for example kthreads never do. If such a task ever ends up calling stack_top(), it will derefence the NULL ABI pointer and crash. This can for example happen when using kunit: mips_stack_top+0x28/0xc0 arch_pick_mmap_layout+0x190/0x220 kunit_vm_mmap_init+0xf8/0x138 __kunit_add_resource+0x40/0xa8 kunit_vm_mmap+0x88/0xd8 usercopy_test_init+0xb8/0x240 kunit_try_run_case+0x5c/0x1a8 kunit_generic_run_threadfn_adapter+0x28/0x50 kthread+0x118/0x240 ret_from_kernel_thread+0x14/0x1c Only dereference the ABI point if it is set. The GIC page is also included as it is specific to the vDSO. Also move the randomization adjustment into the same conditional.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < ab18e48a503230d675e824a0d68a108bdff42503 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < e78033e59444d257d095b73ce5d20625294f6ec2 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < bd90dbd196831f5c2620736dc221db2634cf1e8e (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < 5b6839b572b503609b9b58bc6c04a816eefa0794 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < f22de2027b206ddfb8a075800bb5d0dacf2da4b8 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < 82d140f6aab5e89a9d3972697a0dbe1498752d9b (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < 24d098b6f69b0aa806ffcb3e18259bee31650b28 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < cddf47d20b0325dc8a4e57b833fe96e8f36c42a4 (git)
Affected: ea7e0480a4b695d0aa6b3fa99bd658a003122113 , < e9f4a6b3421e936c3ee9d74710243897d74dbaa2 (git)
Affected: 86717a97f9218de798c6d33e0014ab9325e18f56 (git)
Affected: e4882348eaa9f5f052cb21d2a5aa99a063e4308b (git)
Affected: 4.14.77 , < 4.15 (semver)
Affected: 4.18.15 , < 4.19 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
Show details on NVD website
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      "title": "MIPS: Don\u0027t crash in stack_top() for tasks without ABI or vDSO",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: Don\u0027t crash in stack_top() for tasks without ABI or vDSO\n\nNot all tasks have an ABI associated or vDSO mapped,\nfor example kthreads never do.\nIf such a task ever ends up calling stack_top(), it will derefence the\nNULL ABI pointer and crash.\n\nThis can for example happen when using kunit:\n\n    mips_stack_top+0x28/0xc0\n    arch_pick_mmap_layout+0x190/0x220\n    kunit_vm_mmap_init+0xf8/0x138\n    __kunit_add_resource+0x40/0xa8\n    kunit_vm_mmap+0x88/0xd8\n    usercopy_test_init+0xb8/0x240\n    kunit_try_run_case+0x5c/0x1a8\n    kunit_generic_run_threadfn_adapter+0x28/0x50\n    kthread+0x118/0x240\n    ret_from_kernel_thread+0x14/0x1c\n\nOnly dereference the ABI point if it is set.\n\nThe GIC page is also included as it is specific to the vDSO.\nAlso move the randomization adjustment into the same conditional."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nMIPS: No fallar en stack_top() para tareas sin ABI o vDSO\n\nNo todas las tareas tienen un ABI asociado o vDSO mapeado,\npor ejemplo, los kthreads nunca lo hacen.\nSi una tarea de este tipo alguna vez termina llamando a stack_top(), desreferenciar\u00e1 el puntero ABI NULL y fallar\u00e1.\n\nEsto puede ocurrir, por ejemplo, al usar kunit:\n\n    mips_stack_top+0x28/0xc0\n    arch_pick_mmap_layout+0x190/0x220\n    kunit_vm_mmap_init+0xf8/0x138\n    __kunit_add_resource+0x40/0xa8\n    kunit_vm_mmap+0x88/0xd8\n    usercopy_test_init+0xb8/0x240\n    kunit_try_run_case+0x5c/0x1a8\n    kunit_generic_run_threadfn_adapter+0x28/0x50\n    kthread+0x118/0x240\n    ret_from_kernel_thread+0x14/0x1c\n\nSolo desreferenciar el puntero ABI si est\u00e1 establecido.\n\nLa p\u00e1gina GIC tambi\u00e9n se incluye ya que es espec\u00edfica del vDSO.\nTambi\u00e9n mover el ajuste de aleatorizaci\u00f3n a la misma condicional."
          }
        ],
        "id": "CVE-2025-38696",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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        "published": "2025-09-04T16:15:38.060",
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            "tags": [
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            "tags": [
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            "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
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        "vulnStatus": "Modified",
        "weaknesses": [
          {
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              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-06T15:09:32+00:00",
      "cve": "CVE-2025-38696",
      "id": "CVE-2025-38696",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: MIPS: Don\u0027t crash in stack_top() for tasks without ABI or vDSO",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38696.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T00:57:07Z",
      "cve": "CVE-2025-38696",
      "id": "CVE-2025-38696",
      "initial_release_date": "2025-09-04T23:23:53Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "520",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38696",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-38696.json",
      "version": "12"
    }
  }
}



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Sightings

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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.
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  • 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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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