CVE-2021-46935

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These are the same except for this\ncorner case of asynchronous transactions with payloads < 8 bytes."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: binder: corrige la contabilidad async_free_space para paquetes vac\u00edos En 4.13, el commit 74310e06be4d (\"android: binder: mover el b\u00fafer fuera del \u00e1rea compartida con el espacio del usuario\") solucion\u00f3 un problema de visibilidad de la estructura del kernel. Como parte de ese parche, se us\u00f3 sizeof(void *) como tama\u00f1o de b\u00fafer para cargas de datos de longitud 0, de modo que el controlador pudiera detectar clientes abusivos que enviaran transacciones asincr\u00f3nicas de longitud 0 a un servidor imponiendo l\u00edmites en async_free_size. Desafortunadamente, en el lado \"libre\", la contabilidad de async_free_space no volvi\u00f3 a agregar el tama\u00f1o de (void *). El resultado fue que se filtraron hasta 8 bytes de async_free_space en cada transacci\u00f3n as\u00edncrona de 8 bytes o menos. Estas peque\u00f1as transacciones son poco comunes, por lo que este problema contable ha pasado desapercibido durante varios a\u00f1os. La soluci\u00f3n es utilizar \"buffer_size\" (el tama\u00f1o del b\u00fafer asignado) en lugar de \"size\" (el tama\u00f1o del b\u00fafer l\u00f3gico) al actualizar async_free_space durante la operaci\u00f3n libre. Son iguales excepto por este caso de esquina de transacciones asincr\u00f3nicas con payloads &lt;8 bytes."}], "id": "CVE-2021-46935", "lastModified": "2026-06-17T04:15:54.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "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-2021-46935", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-27T20:52:57.585284Z", "version": "2.0.3"}}]}, "published": "2024-02-27T10:15:07.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/103b16a8c51f96d5fe063022869ea906c256e5da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d2df539d05205fd83c404d5f2dff48d36f9b495"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c7064402609aeb6fb11be1b4ec10673ff17b593"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfd0d84ba28c18b531648c9d4a35ecca89ad9901"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/103b16a8c51f96d5fe063022869ea906c256e5da"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d2df539d05205fd83c404d5f2dff48d36f9b495"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7c7064402609aeb6fb11be1b4ec10673ff17b593"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cfd0d84ba28c18b531648c9d4a35ecca89ad9901"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-668"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: binder: fix async_free_space accounting for empty parcels", "id": "2266436", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266436"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbinder: fix async_free_space accounting for empty parcels\nIn 4.13, commit 74310e06be4d (\"android: binder: Move buffer out of area shared with user space\")\nfixed a kernel structure visibility issue. As part of that patch,\nsizeof(void *) was used as the buffer size for 0-length data payloads so\nthe driver could detect abusive clients sending 0-length asynchronous\ntransactions to a server by enforcing limits on async_free_size.\nUnfortunately, on the \"free\" side, the accounting of async_free_space\ndid not add the sizeof(void *) back. The result was that up to 8-bytes of\nasync_free_space were leaked on every async transaction of 8-bytes or\nless. These small transactions are uncommon, so this accounting issue\nhas gone undetected for several years.\nThe fix is to use \"buffer_size\" (the allocated buffer size) instead of\n\"size\" (the logical buffer size) when updating the async_free_space\nduring the free operation. These are the same except for this\ncorner case of asynchronous transactions with payloads < 8 bytes."], "name": "CVE-2021-46935", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46935\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46935\nhttps://lore.kernel.org/linux-cve-announce/2024022751-CVE-2021-46935-f8f4@gregkh/T/#u"], "threat_severity": "Moderate"}

{}