CVE-2025-39737

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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't 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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/kmemleak.c"], "versions": [{"version": "2abd839aa7e615f2bbc50c8ba7deb9e40d186768", "lessThan": "9f1f4e95031f84867c5821540466d62f88dab8ca", "status": "affected", "versionType": "git"}, {"version": "2abd839aa7e615f2bbc50c8ba7deb9e40d186768", "lessThan": "1ef72a7fedc5bca70e8cc980985790de10d407aa", "status": "affected", "versionType": "git"}, {"version": "2abd839aa7e615f2bbc50c8ba7deb9e40d186768", "lessThan": "a04de4c40aab9b338dfa989cf4aec70fd187eeb2", "status": "affected", "versionType": "git"}, {"version": "2abd839aa7e615f2bbc50c8ba7deb9e40d186768", "lessThan": "f014c10d190b92aad366e56b445daffcd1c075e4", "status": "affected", "versionType": "git"}, {"version": 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[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't really needed. \nHowever, it is probably not worth the effort to optimize for such an edge\ncase that should rarely happen. 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[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't 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": "2026-11-05T22:17:29.133", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39737", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:08:57.432706Z", "version": "2.0.3"}}]}, "published": "2025-09-11T17:15:35.173", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1ef72a7fedc5bca70e8cc980985790de10d407aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d2d22a55ffe35c38e69795468a7addd1a80e9ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/926092268efdf1ed7b55cf486356c74a9e7710d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9b80430c194e4a114dc663c1025d56b4f3d0153d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f1f4e95031f84867c5821540466d62f88dab8ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a04de4c40aab9b338dfa989cf4aec70fd187eeb2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1534ae23c2b6be350c8ab060803fbf6e9682adc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e21a3ddd58733ce31afcb1e5dc3cb80a4b5bc29b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f014c10d190b92aad366e56b445daffcd1c075e4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/kmemleak: avoid soft lockup in __kmemleak_do_cleanup()", "id": "2394643", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2394643"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39737", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39737\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39737\nhttps://lore.kernel.org/linux-cve-announce/2025091137-CVE-2025-39737-f096@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-12T08:02:46.854712+00:00", "updated": "2025-09-12T08:02:46.854814+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}