CVE-2026-43442

{"id": "CVE-2026-43442", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "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": "1cba30bf9fdd6c982708f3587f609a30c370d889", "lessThan": "1f794f9bed3e5cf7250a3b4daf112a72ed1513e9", "versionType": "git"}, {"status": "affected", "version": "1cba30bf9fdd6c982708f3587f609a30c370d889", "lessThan": "6f02c6b196036dbb6defb4647d8707d29b7fe95b", "versionType": "git"}], "programFiles": ["io_uring/io_uring.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"status": "unaffected", "version": "0", "lessThan": "6.19", "versionType": "semver"}, {"status": "unaffected", "version": "6.19.9", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["io_uring/io_uring.c"], "defaultStatus": "affected"}]}], "published": "2026-05-08T15:16:56.663", "references": [{"url": "https://git.kernel.org/stable/c/1f794f9bed3e5cf7250a3b4daf112a72ed1513e9", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6f02c6b196036dbb6defb4647d8707d29b7fe95b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops\n\nWhen IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY,\nthe boundary check for 128-byte SQE operations in io_init_req()\nvalidated the logical SQ head position rather than the physical SQE\nindex.\n\nThe existing check:\n\n !(ctx->cached_sq_head & (ctx->sq_entries - 1))\n\nensures the logical position isn't at the end of the ring, which is\ncorrect for NO_SQARRAY rings where physical == logical. However, when\nsq_array is present, an unprivileged user can remap any logical\nposition to an arbitrary physical index via sq_array. Setting\nsq_array[N] = sq_entries - 1 places a 128-byte operation at the last\nphysical SQE slot, causing the 128-byte memcpy in\nio_uring_cmd_sqe_copy() to read 64 bytes past the end of the SQE\narray.\n\nReplace the cached_sq_head alignment check with a direct validation\nof the physical SQE index, which correctly handles both sq_array and\nNO_SQARRAY cases."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring: correcci\u00f3n de la verificaci\u00f3n de l\u00edmites de SQE f\u00edsico para operaciones SQE_MIXED de 128 bytes\n\nCuando IORING_SETUP_SQE_MIXED se usa sin IORING_SETUP_NO_SQARRAY, la verificaci\u00f3n de l\u00edmites para operaciones SQE de 128 bytes en io_init_req() validaba la posici\u00f3n l\u00f3gica de la cabecera SQ en lugar del \u00edndice SQE f\u00edsico.\n\nLa verificaci\u00f3n existente:\n\n!(ctx -> cached_sq_head & (ctx -> sq_entries - 1))\n\nasegura que la posici\u00f3n l\u00f3gica no est\u00e9 al final del anillo, lo cual es correcto para anillos NO_SQARRAY donde f\u00edsico == l\u00f3gico. Sin embargo, cuando sq_array est\u00e1 presente, un usuario sin privilegios puede reasignar cualquier posici\u00f3n l\u00f3gica a un \u00edndice f\u00edsico arbitrario a trav\u00e9s de sq_array. Establecer sq_array[N] = sq_entries - 1 coloca una operaci\u00f3n de 128 bytes en la \u00faltima ranura SQE f\u00edsica, causando que el memcpy de 128 bytes en io_uring_cmd_sqe_copy() lea 64 bytes m\u00e1s all\u00e1 del final del array SQE.\n\nReemplazar la verificaci\u00f3n de alineaci\u00f3n de cached_sq_head con una validaci\u00f3n directa del \u00edndice SQE f\u00edsico, que maneja correctamente tanto los casos de sq_array como de NO_SQARRAY."}], "lastModified": "2026-11-11T20:10:00.273", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}