CVE-2025-37858

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When l2agsize exceeds 31 (possible with >2TB\naggregates on 32-bit systems), this 32-bit shift operation causes undefined\nbehavior and improper AG sizing.\n\nOn 32-bit architectures:\n- Left-shifting 1 by 32+ bits results in 0 due to integer overflow\n- This creates invalid AG sizes (0 or garbage values) in\nsbi->bmap->db_agsize\n- Subsequent block allocations would reference invalid AG structures\n- Could lead to:\n - Filesystem corruption during extend operations\n - Kernel crashes due to invalid memory accesses\n - Security vulnerabilities via malformed on-disk structures\n\nFix by casting to s64 before shifting:\nbmp->db_agsize = (s64)1 << l2agsize;\n\nThis ensures 64-bit arithmetic even on 32-bit architectures. The cast\nmatches the data type of db_agsize (s64) and follows similar patterns in\nJFS block calculation code.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/jfs/jfs_dmap.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "dd07a985e2ded47b6c7d69fc93c1fe02977c8454", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8bb29629a5e4090e1ef7199cb42db04a52802239", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3d8a45f87010a802aa214bf39702ca9d99cbf3ba", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "55edbf5dbf60a8195c21e92124c4028939ae16b2", "status": 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"https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829"}, {"url": "https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329"}, {"url": "https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a"}, {"url": "https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88"}, {"url": "https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5e"}], "title": "fs/jfs: Prevent integer overflow in AG size calculation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:56:35.947Z"}}]}}

{}

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{"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.293", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.237", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.181", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.135", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.88", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.24", "versionType": "semver"}, {"lessThanOrEqual": "6.13.*", "status": "unaffected", "version": "6.13.12", "versionType": "semver"}, {"lessThanOrEqual": "6.14.*", "status": "unaffected", "version": "6.14.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": 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kernel, the following vulnerability has been resolved:\n\nfs/jfs: Prevent integer overflow in AG size calculation\n\nThe JFS filesystem calculates allocation group (AG) size using 1 <<\nl2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB\naggregates on 32-bit systems), this 32-bit shift operation causes undefined\nbehavior and improper AG sizing.\n\nOn 32-bit architectures:\n- Left-shifting 1 by 32+ bits results in 0 due to integer overflow\n- This creates invalid AG sizes (0 or garbage values) in\nsbi->bmap->db_agsize\n- Subsequent block allocations would reference invalid AG structures\n- Could lead to:\n - Filesystem corruption during extend operations\n - Kernel crashes due to invalid memory accesses\n - Security vulnerabilities via malformed on-disk structures\n\nFix by casting to s64 before shifting:\nbmp->db_agsize = (s64)1 << l2agsize;\n\nThis ensures 64-bit arithmetic even on 32-bit architectures. The cast\nmatches the data type of db_agsize (s64) and follows similar patterns in\nJFS block calculation code.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/jfs: Evitar el desbordamiento de enteros en el c\u00e1lculo del tama\u00f1o de AG El sistema de archivos JFS calcula el tama\u00f1o del grupo de asignaci\u00f3n (AG) usando 1 &lt;&lt; l2agsize en dbExtendFS(). Cuando l2agsize supera 31 (posible con agregados de &gt;2 TB en sistemas de 32 bits), esta operaci\u00f3n de desplazamiento de 32 bits provoca un comportamiento indefinido y un tama\u00f1o de AG incorrecto. En arquitecturas de 32 bits: - Desplazar 1 a la izquierda por 32+ bits da como resultado 0 debido al desbordamiento de enteros - Esto crea tama\u00f1os de AG no v\u00e1lidos (0 o valores basura) en sbi-&gt;bmap-&gt;db_agsize - Las asignaciones de bloques posteriores har\u00edan referencia a estructuras AG no v\u00e1lidas - Podr\u00eda conducir a: - Corrupci\u00f3n del sistema de archivos durante las operaciones de extensi\u00f3n - Fallos del kernel debido a accesos a memoria no v\u00e1lidos - Vulnerabilidades de seguridad mediante estructuras en disco malformadas Soluci\u00f3n mediante la conversi\u00f3n a s64 antes del desplazamiento: bmp-&gt;db_agsize = (s64)1 &lt;&lt; l2agsize; Esto garantiza operaciones aritm\u00e9ticas de 64 bits incluso en arquitecturas de 32 bits. La conversi\u00f3n coincide con el tipo de dato de db_agsize (s64) y sigue patrones similares en el c\u00f3digo de c\u00e1lculo de bloques JFS. Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con SVACE."}], "id": "CVE-2025-37858", "lastModified": "2026-06-17T09:15:34.747", "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": "2025-05-09T07:16:06.827", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d8a45f87010a802aa214bf39702ca9d99cbf3ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55edbf5dbf60a8195c21e92124c4028939ae16b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8bb29629a5e4090e1ef7199cb42db04a52802239"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd07a985e2ded47b6c7d69fc93c1fe02977c8454"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs/jfs: Prevent integer overflow in AG size calculation", "id": "2365266", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2365266"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfs/jfs: Prevent integer overflow in AG size calculation\nThe JFS filesystem calculates allocation group (AG) size using 1 <<\nl2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB\naggregates on 32-bit systems), this 32-bit shift operation causes undefined\nbehavior and improper AG sizing.\nOn 32-bit architectures:\n- Left-shifting 1 by 32+ bits results in 0 due to integer overflow\n- This creates invalid AG sizes (0 or garbage values) in\nsbi->bmap->db_agsize\n- Subsequent block allocations would reference invalid AG structures\n- Could lead to:\n- Filesystem corruption during extend operations\n- Kernel crashes due to invalid memory accesses\n- Security vulnerabilities via malformed on-disk structures\nFix by casting to s64 before shifting:\nbmp->db_agsize = (s64)1 << l2agsize;\nThis ensures 64-bit arithmetic even on 32-bit architectures. The cast\nmatches the data type of db_agsize (s64) and follows similar patterns in\nJFS block calculation code.\nFound by Linux Verification Center (linuxtesting.org) with SVACE."], "name": "CVE-2025-37858", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37858\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37858\nhttps://lore.kernel.org/linux-cve-announce/2025050921-CVE-2025-37858-7d8d@gregkh/T"], "threat_severity": "Moderate"}

{}