{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-39843", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.141Z", "datePublished": "2025-09-19T15:26:17.758Z", "dateUpdated": "2026-05-12T12:07:31.214Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:37:31.134Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: slub: avoid wake up kswapd in set_track_prepare\n\nset_track_prepare() can incur lock recursion.\nThe issue is that it is called from hrtimer_start_range_ns\nholding the per_cpu(hrtimer_bases)[n].lock, but when enabled\nCONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare,\nand try to hold the per_cpu(hrtimer_bases)[n].lock.\n\nAvoid deadlock caused by implicitly waking up kswapd by passing in\nallocation flags, which do not contain __GFP_KSWAPD_RECLAIM in the\ndebug_objects_fill_pool() case. Inside stack depot they are processed by\ngfp_nested_mask().\nSince ___slab_alloc() has preemption disabled, we mask out\n__GFP_DIRECT_RECLAIM from the flags there.\n\nThe oops looks something like:\n\nBUG: spinlock recursion on CPU#3, swapper/3/0\n lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3\nHardware name: Qualcomm Technologies, Inc. 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Inside stack depot they are processed by\ngfp_nested_mask().\nSince ___slab_alloc() has preemption disabled, we mask out\n__GFP_DIRECT_RECLAIM from the flags there.\n\nThe oops looks something like:\n\nBUG: spinlock recursion on CPU#3, swapper/3/0\n lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3\nHardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT)\nCall trace:\nspin_bug+0x0\n_raw_spin_lock_irqsave+0x80\nhrtimer_try_to_cancel+0x94\ntask_contending+0x10c\nenqueue_dl_entity+0x2a4\ndl_server_start+0x74\nenqueue_task_fair+0x568\nenqueue_task+0xac\ndo_activate_task+0x14c\nttwu_do_activate+0xcc\ntry_to_wake_up+0x6c8\ndefault_wake_function+0x20\nautoremove_wake_function+0x1c\n__wake_up+0xac\nwakeup_kswapd+0x19c\nwake_all_kswapds+0x78\n__alloc_pages_slowpath+0x1ac\n__alloc_pages_noprof+0x298\nstack_depot_save_flags+0x6b0\nstack_depot_save+0x14\nset_track_prepare+0x5c\n___slab_alloc+0xccc\n__kmalloc_cache_noprof+0x470\n__set_page_owner+0x2bc\npost_alloc_hook[jt]+0x1b8\nprep_new_page+0x28\nget_page_from_freelist+0x1edc\n__alloc_pages_noprof+0x13c\nalloc_slab_page+0x244\nallocate_slab+0x7c\n___slab_alloc+0x8e8\nkmem_cache_alloc_noprof+0x450\ndebug_objects_fill_pool+0x22c\ndebug_object_activate+0x40\nenqueue_hrtimer[jt]+0xdc\nhrtimer_start_range_ns+0x5f8\n..."}], "id": "CVE-2025-39843", "lastModified": "2026-05-12T13:17:15.250", "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"}]}, "published": "2025-09-19T16:15:43.047", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/243b705a90ed8449f561a271cf251fd2e939f3db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/522ffe298627cfe72539d72167c2e20e72b5e856"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/994b03b9605d36d814c611385fbf90ca6db20aa8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab"}, {"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-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm: slub: avoid wake up kswapd in set_track_prepare", "id": "2396941", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396941"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39843", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39843\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39843\nhttps://lore.kernel.org/linux-cve-announce/2025091903-CVE-2025-39843-0702@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-22T10:00:03.533335+00:00", "updated": "2025-09-22T10:06:24.774265+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}