CVE-2026-46315

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The prep path initializes the\nrequest arguments, but it does not initialize info itself.\n\nIf the wait operation completes without reporting a child event, the common\nwait code can return without writing wo_info. In that case io_waitid_finish()\nstill copies iw->info to userspace, exposing stale bytes from the reused\nio_kiocb command storage.\n\nClear the result storage during prep so the io_uring path matches the\nregular waitid syscall, which uses a zero-initialized struct waitid_info."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/waitid: limpiar la informaci\u00f3n de waitid antes de copiarla al espacio de usuario\n\nIORING_OP_WAITID almacena sus campos de resultado en la estructura io_waitid::info y luego los copia a siginfo del espacio de usuario. La ruta de preparaci\u00f3n inicializa los argumentos de la solicitud, pero no inicializa la propia informaci\u00f3n.\n\nSi la operaci\u00f3n de espera se completa sin informar un evento hijo, el c\u00f3digo de espera com\u00fan puede regresar sin escribir wo_info. En ese caso, io_waitid_finish() todav\u00eda copia iw->info al espacio de usuario, exponiendo bytes obsoletos del almacenamiento de comandos io_kiocb reutilizado.\n\nLimpiar el almacenamiento de resultados durante la preparaci\u00f3n para que la ruta de io_uring coincida con la llamada al sistema waitid regular, que utiliza una estructura waitid_info inicializada a cero."}], "id": "CVE-2026-46315", "lastModified": "2026-11-06T17:17:55.573", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46315", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:13:58.822519Z", "version": "2.0.3"}}]}, "published": "2026-06-09T09:16:30.330", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: io_uring/waitid: clear waitid info before copying it to userspace", "id": "2486933", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486933"}, "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"}, "cwe": "CWE-909", "details": ["A flaw was found in the Linux kernel's `io_uring` subsystem, specifically within the `IORING_OP_WAITID` operation. This vulnerability occurs because the `waitid` information structure is not properly initialized before being copied to userspace. A local user could exploit this to expose stale data from previously used kernel memory, leading to information disclosure."], "name": "CVE-2026-46315", "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": "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": "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": "2026-06-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46315\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46315\nhttps://lore.kernel.org/linux-cve-announce/2026060920-CVE-2026-46315-2caa@gregkh/T"], "threat_severity": "Moderate"}

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