CVE-2026-46294

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The code in retrieve_status checks that the output string fits into\n the output buffer and writes the output string there\n2. Then, the code aligns the \"outptr\" variable to the next 8-byte\n boundary:\n\toutptr = align_ptr(outptr);\n3. The alignment doesn't check overflow, so outptr could point past the\n buffer end\n4. The \"for\" loop is iterated again, it executes:\n\tremaining = len - (outptr - outbuf);\n5. If \"outptr\" points past \"outbuf + len\", the arithmetics wraps around\n and the variable \"remaining\" contains unusually high number\n6. With \"remaining\" being high, the code writes more data past the end of\n the buffer\n\nLuckily, this bug has no security implications because:\n1. Only root can issue device mapper ioctls\n2. The commonly used libraries that communicate with device mapper\n (libdevmapper and devicemapper-rs) use buffer size that is aligned to\n 8 bytes - thus, \"outptr = align_ptr(outptr)\" can't overshoot the input\n buffer and the bug can't happen accidentally"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm: corrige un desbordamiento de b\u00fafer en el procesamiento de ioctl\n\nTony Asleson (usando Claude) encontr\u00f3 un desbordamiento de b\u00fafer en dm-ioctl en la funci\u00f3n retrieve_status:\n\n1. El c\u00f3digo en retrieve_status verifica que la cadena de salida cabe en el b\u00fafer de salida y escribe la cadena de salida all\u00ed\n2. Luego, el c\u00f3digo alinea la variable 'outptr' al siguiente l\u00edmite de 8 bytes:\n\toutptr = align_ptr(outptr);\n3. La alineaci\u00f3n no verifica el desbordamiento, por lo que 'outptr' podr\u00eda apuntar m\u00e1s all\u00e1 del final del b\u00fafer\n4. El bucle 'for' se itera de nuevo, ejecuta:\n\tremaining = len - (outptr - outbuf);\n5. Si 'outptr' apunta m\u00e1s all\u00e1 de 'outbuf + len', la aritm\u00e9tica se desborda y la variable 'remaining' contiene un n\u00famero inusualmente alto\n6. Siendo 'remaining' alto, el c\u00f3digo escribe m\u00e1s datos m\u00e1s all\u00e1 del final del b\u00fafer\n\nAfortunadamente, este error no tiene implicaciones de seguridad porque:\n1. Solo root puede emitir ioctls del mapeador de dispositivos\n2. Las bibliotecas com\u00fanmente utilizadas que se comunican con el mapeador de dispositivos (libdevmapper y devicemapper-rs) usan un tama\u00f1o de b\u00fafer que est\u00e1 alineado a 8 bytes; por lo tanto, 'outptr = align_ptr(outptr)' no puede exceder el b\u00fafer de entrada y el error no puede ocurrir accidentalmente"}], "id": "CVE-2026-46294", "lastModified": "2026-11-06T17:17:54.643", "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-2026-46294", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:13:35.534465Z", "version": "2.0.3"}}]}, "published": "2026-06-08T17:16:47.757", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm: fix a buffer overflow in ioctl processing", "id": "2486454", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486454"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel, specifically within the `dm-ioctl` module. An improper pointer alignment in the `retrieve_status` function could lead to a buffer overflow, where data is written beyond the allocated buffer. Despite this, the vulnerability has no practical security implications as it requires root privileges to trigger, and standard library usage prevents accidental exploitation."], "name": "CVE-2026-46294", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46294\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46294\nhttps://lore.kernel.org/linux-cve-announce/2026060857-CVE-2026-46294-dcc8@gregkh/T"], "threat_severity": "Moderate"}

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