CVE-2026-23025

{"id": "CVE-2026-23025", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2026-01-31T12:16:05.820", "references": [{"url": "https://git.kernel.org/stable/c/038a102535eb49e10e93eafac54352fcc5d78847", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3098f8f7c7b0686c74827aec42a2c45e69801ff8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4a04ff9cd816e7346fcc8126f00ed80481f6569d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/68688fc4eab007834b4c2d740214423ba2a335a8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/df63d31e9ae02e2f6cd96147779e4ed7cd0e75f6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: prevent pcp corruption with SMP=n\n\nThe kernel test robot has reported:\n\n BUG: spinlock trylock failure on UP on CPU#0, kcompactd0/28\n lock: 0xffff888807e35ef0, .magic: dead4ead, .owner: kcompactd0/28, .owner_cpu: 0\n CPU: 0 UID: 0 PID: 28 Comm: kcompactd0 Not tainted 6.18.0-rc5-00127-ga06157804399 #1 PREEMPT 8cc09ef94dcec767faa911515ce9e609c45db470\n Call Trace:\n <IRQ>\n __dump_stack (lib/dump_stack.c:95)\n dump_stack_lvl (lib/dump_stack.c:123)\n dump_stack (lib/dump_stack.c:130)\n spin_dump (kernel/locking/spinlock_debug.c:71)\n do_raw_spin_trylock (kernel/locking/spinlock_debug.c:?)\n _raw_spin_trylock (include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)\n __free_frozen_pages (mm/page_alloc.c:2973)\n ___free_pages (mm/page_alloc.c:5295)\n __free_pages (mm/page_alloc.c:5334)\n tlb_remove_table_rcu (include/linux/mm.h:? include/linux/mm.h:3122 include/asm-generic/tlb.h:220 mm/mmu_gather.c:227 mm/mmu_gather.c:290)\n ? __cfi_tlb_remove_table_rcu (mm/mmu_gather.c:289)\n ? rcu_core (kernel/rcu/tree.c:?)\n rcu_core (include/linux/rcupdate.h:341 kernel/rcu/tree.c:2607 kernel/rcu/tree.c:2861)\n rcu_core_si (kernel/rcu/tree.c:2879)\n handle_softirqs (arch/x86/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:623)\n __irq_exit_rcu (arch/x86/include/asm/jump_label.h:36 kernel/softirq.c:725)\n irq_exit_rcu (kernel/softirq.c:741)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1052)\n </IRQ>\n <TASK>\n RIP: 0010:_raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)\n free_pcppages_bulk (mm/page_alloc.c:1494)\n drain_pages_zone (include/linux/spinlock.h:391 mm/page_alloc.c:2632)\n __drain_all_pages (mm/page_alloc.c:2731)\n drain_all_pages (mm/page_alloc.c:2747)\n kcompactd (mm/compaction.c:3115)\n kthread (kernel/kthread.c:465)\n ? __cfi_kcompactd (mm/compaction.c:3166)\n ? __cfi_kthread (kernel/kthread.c:412)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ? __cfi_kthread (kernel/kthread.c:412)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:255)\n </TASK>\n\nMatthew has analyzed the report and identified that in drain_page_zone()\nwe are in a section protected by spin_lock(&pcp->lock) and then get an\ninterrupt that attempts spin_trylock() on the same lock. The code is\ndesigned to work this way without disabling IRQs and occasionally fail the\ntrylock with a fallback. However, the SMP=n spinlock implementation\nassumes spin_trylock() will always succeed, and thus it's normally a\nno-op. Here the enabled lock debugging catches the problem, but otherwise\nit could cause a corruption of the pcp structure.\n\nThe problem has been introduced by commit 574907741599 (\"mm/page_alloc:\nleave IRQs enabled for per-cpu page allocations\"). The pcp locking scheme\nrecognizes the need for disabling IRQs to prevent nesting spin_trylock()\nsections on SMP=n, but the need to prevent the nesting in spin_lock() has\nnot been recognized. Fix it by introducing local wrappers that change the\nspin_lock() to spin_lock_iqsave() with SMP=n and use them in all places\nthat do spin_lock(&pcp->lock).\n\n[vbabka@suse.cz: add pcp_ prefix to the spin_lock_irqsave wrappers, per Steven]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/page_alloc: evitar la corrupci\u00f3n de pcp con SMP=n\n\nEl robot de pruebas del kernel ha informado:\n\n BUG: spinlock trylock failure on UP on CPU#0, kcompactd0/28\n lock: 0xffff888807e35ef0, .magic: dead4ead, .owner: kcompactd0/28, .owner_cpu: 0\n CPU: 0 UID: 0 PID: 28 Comm: kcompactd0 Not tainted 6.18.0-rc5-00127-ga06157804399 #1 PREEMPT 8cc09ef94dcec767faa911515ce9e609c45db470\n Call Trace:\n \n __dump_stack (lib/dump_stack.c:95)\n dump_stack_lvl (lib/dump_stack.c:123)\n dump_stack (lib/dump_stack.c:130)\n spin_dump (kernel/locking/spinlock_debug.c:71)\n do_raw_spin_trylock (kernel/locking/spinlock_debug.c:?)\n _raw_spin_trylock (include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)\n __free_frozen_pages (mm/page_alloc.c:2973)\n ___free_pages (mm/page_alloc.c:5295)\n __free_pages (mm/page_alloc.c:5334)\n tlb_remove_table_rcu (include/linux/mm.h:? include/linux/mm.h:3122 include/asm-generic/tlb.h:220 mm/mmu_gather.c:227 mm/mmu_gather.c:290)\n ? __cfi_tlb_remove_table_rcu (mm/mmu_gather.c:289)\n ? rcu_core (kernel/rcu/tree.c:?)\n rcu_core (include/linux/rcupdate.h:341 kernel/rcu/tree.c:2607 kernel/rcu/tree.c:2861)\n rcu_core_si (kernel/rcu/tree.c:2879)\n handle_softirqs (arch/x86/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:623)\n __irq_exit_rcu (arch/x86/include/asm/jump_label.h:36 kernel/softirq.c:725)\n irq_exit_rcu (kernel/softirq.c:741)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1052)\n \n \n RIP: 0010:_raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)\n free_pcppages_bulk (mm/page_alloc.c:1494)\n drain_pages_zone (include/linux/spinlock.h:391 mm/page_alloc.c:2632)\n __drain_all_pages (mm/page_alloc.c:2731)\n drain_all_pages (mm/page_alloc.c:2747)\n kcompactd (mm/compaction.c:3115)\n kthread (kernel/kthread.c:465)\n ? __cfi_kcompactd (mm/compaction.c:3166)\n ? __cfi_kthread (kernel/kthread.c:412)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ? __cfi_kthread (kernel/kthread.c:412)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:255)\n \n\nMatthew ha analizado el informe y ha identificado que en drain_page_zone() estamos en una secci\u00f3n protegida por spin_lock(&amp;pcp-&gt;lock) y luego recibimos una interrupci\u00f3n que intenta spin_trylock() en el mismo bloqueo. El c\u00f3digo est\u00e1 dise\u00f1ado para funcionar de esta manera sin deshabilitar las IRQ y ocasionalmente fallar el trylock con un mecanismo de respaldo. Sin embargo, la implementaci\u00f3n de spinlock con SMP=n asume que spin_trylock() siempre tendr\u00e1 \u00e9xito, y por lo tanto, normalmente es una operaci\u00f3n nula. Aqu\u00ed, la depuraci\u00f3n de bloqueo habilitada detecta el problema, pero de lo contrario podr\u00eda causar una corrupci\u00f3n de la estructura pcp.\n\nEl problema ha sido introducido por el commit 574907741599 ('mm/page_alloc: dejar las IRQ habilitadas para las asignaciones de p\u00e1ginas por CPU'). El esquema de bloqueo de pcp reconoce la necesidad de deshabilitar las IRQ para evitar el anidamiento de secciones spin_trylock() en SMP=n, pero la necesidad de evitar el anidamiento en spin_lock() no ha sido reconocida. Solucionarlo introduciendo envoltorios locales que cambian el spin_lock() a spin_lock_iqsave() con SMP=n y us\u00e1ndolos en todos los lugares que realizan spin_lock(&amp;pcp-&gt;lock).\n\n[vbabka@suse.cz: a\u00f1adir el prefijo pcp_ a los envoltorios spin_lock_irqsave, seg\u00fan Steven]"}], "lastModified": "2026-03-25T16:04:16.947", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "91818618-A454-44A2-8AC3-1EA930B1D7F1", "versionEndExcluding": "6.1.162", "versionStartIncluding": "6.1.57"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C6294D7D-A6FB-4780-9265-FCCFB16573A9", "versionEndExcluding": "6.6.122", "versionStartIncluding": "6.2.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7456F614-6AA8-4C08-8229-BA342D4AFBAD", "versionEndExcluding": "6.12.67", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "99FF3E05-0E7A-44E9-8E47-BF6F1F8EC436", "versionEndExcluding": "6.18.7", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.2:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3ADCCCEE-143A-4B48-9B2A-0CB97BD385DE"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}