CVE-2025-39835

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code\n\nENODATA (aka ENOATTR) has a very specific meaning in the xfs xattr code;\nnamely, that the requested attribute name could not be found.\n\nHowever, a medium error from disk may also return ENODATA. At best,\nthis medium error may escape to userspace as \"attribute not found\"\nwhen in fact it's an IO (disk) error.\n\nAt worst, we may oops in xfs_attr_leaf_get() when we do:\n\n\terror = xfs_attr_leaf_hasname(args, &bp);\n\tif (error == -ENOATTR) {\n\t\txfs_trans_brelse(args->trans, bp);\n\t\treturn error;\n\t}\n\nbecause an ENODATA/ENOATTR error from disk leaves us with a null bp,\nand the xfs_trans_brelse will then null-deref it.\n\nAs discussed on the list, we really need to modify the lower level\nIO functions to trap all disk errors and ensure that we don't let\nunique errors like this leak up into higher xfs functions - many\nlike this should be remapped to EIO.\n\nHowever, this patch directly addresses a reported bug in the xattr\ncode, and should be safe to backport to stable kernels. A larger-scope\npatch to handle more unique errors at lower levels can follow later.\n\n(Note, prior to 07120f1abdff we did not oops, but we did return the\nwrong error code to userspace.)"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: no propagar errores de disco ENODATA al c\u00f3digo xattr\n\nENODATA (tambi\u00e9n conocido como ENOATTR) tiene un significado muy espec\u00edfico en el c\u00f3digo xattr de xfs; a saber, que el nombre de atributo solicitado no pudo ser encontrado.\n\nSin embargo, un error de medio del disco tambi\u00e9n puede devolver ENODATA. En el mejor de los casos, este error de medio puede escapar al espacio de usuario como 'atributo no encontrado' cuando de hecho es un error de E/S (disco).\n\nEn el peor de los casos, podemos fallar en xfs_attr_leaf_get() cuando hacemos:\n\n\terror = xfs_attr_leaf_hasname(args, &bp);\n\tif (error == -ENOATTR) {\n\t\txfs_trans_brelse(args->trans, bp);\n\t\treturn error;\n\t}\n\nporque un error ENODATA/ENOATTR del disco nos deja con un 'bp' nulo, y xfs_trans_brelse entonces realizar\u00e1 una desreferenciaci\u00f3n de puntero nulo.\n\nComo se discuti\u00f3 en la lista, realmente necesitamos modificar las funciones de E/S de nivel inferior para interceptar todos los errores de disco y asegurar que no permitimos que errores \u00fanicos como este se filtren a funciones xfs de nivel superior; muchos como este deber\u00edan ser reasignados a EIO.\n\nSin embargo, este parche aborda directamente un error reportado en el c\u00f3digo xattr, y deber\u00eda ser seguro retroportarlo a kernels estables. Un parche de mayor alcance para manejar m\u00e1s errores \u00fanicos en niveles inferiores puede seguir m\u00e1s tarde.\n\n(Nota: antes de 07120f1abdff no fall\u00e1bamos, pero s\u00ed devolv\u00edamos el c\u00f3digo de error incorrecto al espacio de usuario.)"}], "id": "CVE-2025-39835", "lastModified": "2026-11-05T22:17:33.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39835", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:12:24.668301Z", "version": "2.0.3"}}]}, "published": "2025-09-16T14:15:51.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/157ddfb05961c68ab7d457a462822a698e4e4bf4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39fc2742ca14f7fbc621ce9b43bcbd00248cb9a8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90bae69c2959c39912f0c2f07a9a7894f3fc49f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ae668cd567a6a7622bc813ee0bb61c42bed61ba7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d3cc7476b89fb45b7e00874f4f56f6b928467c60"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dcdf36f1b67884c722abce9b8946e34ffb9f67c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e358d4b6225e4c1eb208686a05e360ef8df59e07"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: xfs: do not propagate ENODATA disk errors into xattr code", "id": "2395780", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395780"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-39835", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39835\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39835\nhttps://lore.kernel.org/linux-cve-announce/2025091658-CVE-2025-39835-6f82@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-17T10:04:25.080478+00:00", "updated": "2025-09-17T10:04:25.080513+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}