CVE-2025-39737 (GCVE-0-2025-39737)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-05-12 12:06
VLAI
Title
mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup() A soft lockup warning was observed on a relative small system x86-64 system with 16 GB of memory when running a debug kernel with kmemleak enabled. watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134] The test system was running a workload with hot unplug happening in parallel. Then kemleak decided to disable itself due to its inability to allocate more kmemleak objects. The debug kernel has its CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000. The soft lockup happened in kmemleak_do_cleanup() when the existing kmemleak objects were being removed and deleted one-by-one in a loop via a workqueue. In this particular case, there are at least 40,000 objects that need to be processed and given the slowness of a debug kernel and the fact that a raw_spinlock has to be acquired and released in __delete_object(), it could take a while to properly handle all these objects. As kmemleak has been disabled in this case, the object removal and deletion process can be further optimized as locking isn't really needed. However, it is probably not worth the effort to optimize for such an edge case that should rarely happen. So the simple solution is to call cond_resched() at periodic interval in the iteration loop to avoid soft lockup.
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 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < 9f1f4e95031f84867c5821540466d62f88dab8ca (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < 1ef72a7fedc5bca70e8cc980985790de10d407aa (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < a04de4c40aab9b338dfa989cf4aec70fd187eeb2 (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < f014c10d190b92aad366e56b445daffcd1c075e4 (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < 8d2d22a55ffe35c38e69795468a7addd1a80e9ce (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < 926092268efdf1ed7b55cf486356c74a9e7710d1 (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < 9b80430c194e4a114dc663c1025d56b4f3d0153d (git)
Affected: 2abd839aa7e615f2bbc50c8ba7deb9e40d186768 , < d1534ae23c2b6be350c8ab060803fbf6e9682adc (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (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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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()\n\nA soft lockup warning was observed on a relative small system x86-64\nsystem with 16 GB of memory when running a debug kernel with kmemleak\nenabled.\n\n  watchdog: BUG: soft lockup - CPU#8 stuck for 33s! [kworker/8:1:134]\n\nThe test system was running a workload with hot unplug happening in\nparallel.  Then kemleak decided to disable itself due to its inability to\nallocate more kmemleak objects.  The debug kernel has its\nCONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE set to 40,000.\n\nThe soft lockup happened in kmemleak_do_cleanup() when the existing\nkmemleak objects were being removed and deleted one-by-one in a loop via a\nworkqueue.  In this particular case, there are at least 40,000 objects\nthat need to be processed and given the slowness of a debug kernel and the\nfact that a raw_spinlock has to be acquired and released in\n__delete_object(), it could take a while to properly handle all these\nobjects.\n\nAs kmemleak has been disabled in this case, the object removal and\ndeletion process can be further optimized as locking isn\u0027t really needed. \nHowever, it is probably not worth the effort to optimize for such an edge\ncase that should rarely happen.  So the simple solution is to call\ncond_resched() at periodic interval in the iteration loop to avoid soft\nlockup."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/kmemleak: evitar un soft lockup en __kmemleak_do_cleanup()\n\nSe observ\u00f3 una advertencia de soft lockup en un sistema x86-64 relativamente peque\u00f1o con 16 GB de memoria al ejecutar un kernel de depuraci\u00f3n con kmemleak habilitado.\n\n  watchdog: BUG: soft lockup - CPU#8 atascada durante 33s! [kworker/8:1:134]\n\nEl sistema de prueba estaba ejecutando una carga de trabajo con hot unplug ocurriendo en paralelo. Entonces kmemleak decidi\u00f3 deshabilitarse debido a su incapacidad para asignar m\u00e1s objetos kmemleak. El kernel de depuraci\u00f3n tiene su CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE configurado en 40.000.\n\nEl soft lockup ocurri\u00f3 en kmemleak_do_cleanup() cuando los objetos kmemleak existentes estaban siendo eliminados y borrados uno por uno en un bucle a trav\u00e9s de una workqueue. En este caso particular, hay al menos 40.000 objetos que necesitan ser procesados y, dada la lentitud de un kernel de depuraci\u00f3n y el hecho de que un raw_spinlock tiene que ser adquirido y liberado en __delete_object(), podr\u00eda llevar un tiempo manejar correctamente todos estos objetos.\n\nComo kmemleak ha sido deshabilitado en este caso, el proceso de eliminaci\u00f3n y borrado de objetos puede ser optimizado a\u00fan m\u00e1s ya que el bloqueo no es realmente necesario. Sin embargo, probablemente no vale la pena el esfuerzo de optimizar para un caso tan extremo que rara vez deber\u00eda ocurrir. As\u00ed que la soluci\u00f3n simple es llamar a cond_resched() a intervalos peri\u00f3dicos en el bucle de iteraci\u00f3n para evitar un soft lockup."
          }
        ],
        "id": "CVE-2025-39737",
        "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": "2025-09-11T17:15:35.173",
        "references": [
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            "tags": [
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            "tags": [
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              "Third Party Advisory"
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          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
          }
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        "vulnStatus": "Modified",
        "weaknesses": [
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              {
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                "value": "CWE-401"
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            "source": "nvd@nist.gov",
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:24:04+00:00",
      "cve": "CVE-2025-39737",
      "id": "CVE-2025-39737",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39737.json",
      "version": "3"
    }
  }
}



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