CVE-2025-39725

{"id": "CVE-2025-39725", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1c9798bf8145a92abf45aa9d38a6406d9eb8bdf0", "lessThan": "656eaddbc952e1baae2f69281c22debe22140312", "versionType": "git"}, {"status": "affected", "version": "1b0449544c6482179ac84530b61fc192a6527bfd", "lessThan": "c1101113d45838a823188ae25c61af97552a28ae", "versionType": "git"}, {"status": "affected", "version": "1b0449544c6482179ac84530b61fc192a6527bfd", "lessThan": "9f1e8cd0b7c4c944e9921b52a6661b5eda2705ab", "versionType": "git"}, {"status": "affected", "version": "912e9f0300c3564b72a8808db406e313193a37ad", "versionType": "git"}, {"status": "affected", "version": "6.12.26", "lessThan": "6.12.41", "versionType": "semver"}, {"status": "affected", "version": "6.14.5", "lessThan": "6.15", "versionType": "semver"}], "programFiles": ["mm/memory-failure.c", "mm/vmscan.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"status": "unaffected", "version": "0", "lessThan": "6.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.41", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.15.9", "versionType": "semver", "lessThanOrEqual": "6.15.*"}, {"status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["mm/memory-failure.c", "mm/vmscan.c"], "defaultStatus": "affected"}]}], "published": "2025-09-05T18:15:50.320", "references": [{"url": "https://git.kernel.org/stable/c/656eaddbc952e1baae2f69281c22debe22140312", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9f1e8cd0b7c4c944e9921b52a6661b5eda2705ab", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c1101113d45838a823188ae25c61af97552a28ae", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vmscan: fix hwpoisoned large folio handling in shrink_folio_list\n\nIn shrink_folio_list(), the hwpoisoned folio may be large folio, which\ncan't be handled by unmap_poisoned_folio(). For THP, try_to_unmap_one()\nmust be passed with TTU_SPLIT_HUGE_PMD to split huge PMD first and then\nretry. Without TTU_SPLIT_HUGE_PMD, we will trigger null-ptr deref of\npvmw.pte. Even we passed TTU_SPLIT_HUGE_PMD, we will trigger a\nWARN_ON_ONCE due to the page isn't in swapcache.\n\nSince UCE is rare in real world, and race with reclaimation is more rare,\njust skipping the hwpoisoned large folio is enough. memory_failure() will\nhandle it if the UCE is triggered again.\n\nThis happens when memory reclaim for large folio races with\nmemory_failure(), and will lead to kernel panic. The race is as\nfollows:\n\ncpu0 cpu1\n shrink_folio_list memory_failure\n TestSetPageHWPoison\n unmap_poisoned_folio\n --> trigger BUG_ON due to\n unmap_poisoned_folio couldn't\n handle large folio\n\n[tujinjiang@huawei.com: add comment to unmap_poisoned_folio()]"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/vmscan: corregir el manejo de folios grandes 'hwpoisoned' en shrink_folio_list\n\nEn shrink_folio_list(), el folio 'hwpoisoned' puede ser un folio grande, que no puede ser manejado por unmap_poisoned_folio(). Para THP, try_to_unmap_one() debe ser pasado con TTU_SPLIT_HUGE_PMD para dividir el PMD enorme primero y luego reintentar. Sin TTU_SPLIT_HUGE_PMD, activaremos una desreferencia de puntero nulo de pvmw.pte. Incluso si pasamos TTU_SPLIT_HUGE_PMD, activaremos un WARN_ON_ONCE debido a que la p\u00e1gina no est\u00e1 en la swapcache.\n\nDado que UCE es raro en el mundo real, y la condici\u00f3n de carrera con la reclamaci\u00f3n es a\u00fan m\u00e1s rara, simplemente omitir el folio grande 'hwpoisoned' es suficiente. memory_failure() lo manejar\u00e1 si el UCE se activa de nuevo.\n\nEsto ocurre cuando la reclamaci\u00f3n de memoria para un folio grande entra en condici\u00f3n de carrera con memory_failure(), y conducir\u00e1 a un p\u00e1nico del kernel. La condici\u00f3n de carrera es la siguiente:\n\ncpu0 cpu1\n shrink_folio_list memory_failure\n TestSetPageHWPoison\n unmap_poisoned_folio\n --> activa BUG_ON debido a\n unmap_poisoned_folio no pudo\n manejar folios grandes\n\n[tujinjiang@huawei.com: a\u00f1adir comentario a unmap_poisoned_folio()]"}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "19B129C6-1ABE-4712-8AB0-009FB92F8F2B", "versionEndExcluding": "6.12.41", "versionStartIncluding": "6.12.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E63E673B-291A-456D-A515-12B29693073E", "versionEndExcluding": "6.15.9", "versionStartIncluding": "6.14.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "09709862-E348-4378-8632-5A7813EDDC86"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "415BF58A-8197-43F5-B3D7-D1D63057A26E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A0517869-312D-4429-80C2-561086E1421C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "85421F4E-C863-4ABF-B4B4-E887CC2F7F92"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3827F0D4-5FEE-4181-B267-5A45E7CA11FC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7A9C2DE5-43B8-4D73-BDB5-EA55C7671A52"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}