CVE-2025-38008

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{}

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IOW\n\t * people are trying to disable something that wasn't yet fully\n\t * enabled. This suggests an ordering problem on the user side.\n\t */\n\nThe effect of this static_branch optimization is only visible on\nmicrobenchmark.\n\nInstead of adding more complexity around it, remove it altogether."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/page_alloc: arregla la condici\u00f3n de ejecuci\u00f3n en el manejo de memoria no aceptada El asignador de p\u00e1ginas rastrea el n\u00famero de zonas que tienen memoria no aceptada usando static_branch_enc/dec() y usa esa rama est\u00e1tica en rutas activas para determinar si necesita lidiar con memoria no aceptada. Borislav y Thomas se\u00f1alaron que el rastreo es acelerado: las operaciones en static_branch no se serializan contra la adici\u00f3n/eliminaci\u00f3n de p\u00e1ginas no aceptadas a/desde la zona. Las comprobaciones de cordura dentro de la maquinaria static_branch lo detectan: ADVERTENCIA: CPU: 0 PID: 10 en kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0 El comentario alrededor de WARN() explica el problema: /* * Sin embargo, advierte sobre el caso '-1'; ya que eso significa que un * decremento es concurrente con un primer incremento (0->1). Es decir, * se est\u00e1 intentando deshabilitar algo que a\u00fan no estaba completamente habilitado. Esto sugiere un problema de ordenamiento del usuario. */ El efecto de esta optimizaci\u00f3n de static_branch solo es visible en microbenchmark. En lugar de a\u00f1adir m\u00e1s complejidad, elim\u00ednenla por completo."}], "id": "CVE-2025-38008", "lastModified": "2026-06-17T09:15:52.390", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T10:15:32.037", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/page_alloc: fix race condition in unaccepted memory handling", "id": "2373372", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373372"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nmm/page_alloc: fix race condition in unaccepted memory handling\nThe page allocator tracks the number of zones that have unaccepted memory\nusing static_branch_enc/dec() and uses that static branch in hot paths to\ndetermine if it needs to deal with unaccepted memory.\nBorislav and Thomas pointed out that the tracking is racy: operations on\nstatic_branch are not serialized against adding/removing unaccepted pages\nto/from the zone.\nSanity checks inside static_branch machinery detects it:\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\nThe comment around the WARN() explains the problem:\n/*\n* Warn about the '-1' case though; since that means a\n* decrement is concurrent with a first (0->1) increment. IOW\n* people are trying to disable something that wasn't yet fully\n* enabled. This suggests an ordering problem on the user side.\n*/\nThe effect of this static_branch optimization is only visible on\nmicrobenchmark.\nInstead of adding more complexity around it, remove it altogether."], "name": "CVE-2025-38008", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "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": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38008\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38008\nhttps://lore.kernel.org/linux-cve-announce/2025061841-CVE-2025-38008-a365@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:47.647969+00:00", "updated": "2025-06-23T08:53:47.648028+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}