CVE-2021-47511

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sizes\n\nThe period size calculation in OSS layer may receive a negative value\nas an error, but the code there assumes only the positive values and\nhandle them with size_t. Due to that, a too big value may be passed\nto the lower layers.\n\nThis patch changes the code to handle with ssize_t and adds the proper\nerror checks appropriately."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: pcm: oss: corrige tama\u00f1os de per\u00edodo/b\u00fafer negativos El c\u00e1lculo del tama\u00f1o del per\u00edodo en la capa OSS puede recibir un valor negativo como error, pero el c\u00f3digo all\u00ed asume solo los valores positivos y manejarlos con size_t. Debido a esto, es posible que se pase un valor demasiado grande a las capas inferiores. Este parche cambia el c\u00f3digo para manejar con ssize_t y agrega las comprobaciones de errores adecuadas."}], "id": "CVE-2021-47511", "lastModified": "2026-06-17T04:17:39.697", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47511", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-29T17:05:32.798414Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:12.237", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be8869d388593e57223ad39297c8e54be632f2f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/be8869d388593e57223ad39297c8e54be632f2f2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049"}], "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: ALSA: pcm: oss: Fix negative period/buffer sizes", "id": "2283441", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283441"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20->CWE-190", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nALSA: pcm: oss: Fix negative period/buffer sizes\nThe period size calculation in OSS layer may receive a negative value\nas an error, but the code there assumes only the positive values and\nhandle them with size_t. Due to that, a too big value may be passed\nto the lower layers.\nThis patch changes the code to handle with ssize_t and adds the proper\nerror checks appropriately."], "name": "CVE-2021-47511", "package_state": [{"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": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47511\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47511\nhttps://lore.kernel.org/linux-cve-announce/2024052430-CVE-2021-47511-7bec@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:36.149118+00:00", "updated": "2025-07-12T22:31:36.149187+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}