CVE-2025-38008

{"id": "CVE-2025-38008", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.0}]}, "published": "2025-06-18T10:15:32.037", "references": [{"url": "https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: fix race condition in unaccepted memory handling\n\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.\n\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.\n\nSanity checks inside static_branch machinery detects it:\n\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\n\nThe comment around the WARN() explains the problem:\n\n\t/*\n\t * Warn about the '-1' case though; since that means a\n\t * decrement is concurrent with a first (0->1) increment. 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."}], "lastModified": "2025-11-17T12:56:52.697", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D0DDEC71-DA9A-4DD8-9AE4-E164CFC5E573", "versionEndExcluding": "6.6.92", "versionStartIncluding": "6.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8F43EF2E-9448-4BCA-99D9-DAEAEB7523C5", "versionEndExcluding": "6.12.30", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D4458049-AD51-4F1B-BAB9-C32B53A54DE1", "versionEndExcluding": "6.14.8", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4C9D071F-B28E-46EC-AC61-22B913390211"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13FC0DDE-E513-465E-9E81-515702D49B74"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8C7B5B0E-4EEB-48F5-B4CF-0935A7633845"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2D240580-3048-49B2-9E27-F115A9DF8224"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "90320558-E553-4EF5-8A0B-0F5D20113BD2"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}