CVE-2021-47650

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card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\nAnd snd_soc_register_card() is called by various platforms.\nTherefore, it is better to add the check in the case of misusing.\nAnd because 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/soc/soc-compress.c"], "versions": [{"version": "467fece8fbc6774a3a3bd0981e1a342fb5022706", "lessThan": "68a69ad8df959e5211ed4a8e120783b2d352ea74", "status": "affected", "versionType": "git"}, {"version": "467fece8fbc6774a3a3bd0981e1a342fb5022706", 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{"url": "https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b"}, {"url": "https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60"}, {"url": "https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: soc-compress: prevent the potentially use of null pointer\n\nThere is one call trace that snd_soc_register_card()\n->snd_soc_bind_card()->soc_init_pcm_runtime()\n->snd_soc_dai_compress_new()->snd_soc_new_compress().\nIn the trace the 'codec_dai' transfers from card->dai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\nAnd snd_soc_register_card() is called by various platforms.\nTherefore, it is better to add the check in the case of misusing.\nAnd because 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.189", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.110", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.33", "versionStartIncluding": "5.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16.19", "versionStartIncluding": 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En el seguimiento, 'codec_dai' se transfiere desde card->dai_link, y podemos ver desde snd_soc_add_pcm_runtime() en snd_soc_bind_card() que, si el valor de card->dai_link->num_codecs es 0, entonces 'codec_dai' podr\u00eda ser un puntero nulo causado por un \u00edndice fuera de los l\u00edmites en 'asoc_rtd_to_codec(rtd, 0)'. Adem\u00e1s, varias plataformas llaman a snd_soc_register_card(), por lo que es mejor agregar la verificaci\u00f3n en caso de uso incorrecto. Y como 'cpu_dai' ya se ha verificado en soc_init_pcm_runtime(), no es necesario volver a verificar. Si se agrega la verificaci\u00f3n de la siguiente manera, si 'codec_dai' es nulo, snd_soc_new_compress() no pasar\u00e1 la verificaci\u00f3n 'if (playback + capture != 1)', lo que evita el uso sobrante de 'codec_dai'."}], "id": "CVE-2021-47650", "lastModified": "2026-11-05T20:16:55.650", "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-2021-47650", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T19:42:28.630527Z", "version": "2.0.3"}}]}, "published": "2025-02-26T06:37:06.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ASoC: soc-compress: prevent the potentially use of null pointer", "id": "2347718", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347718"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nASoC: soc-compress: prevent the potentially use of null pointer\nThere is one call trace that snd_soc_register_card()\n->snd_soc_bind_card()->soc_init_pcm_runtime()\n->snd_soc_dai_compress_new()->snd_soc_new_compress().\nIn the trace the 'codec_dai' transfers from card->dai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\nAnd snd_soc_register_card() is called by various platforms.\nTherefore, it is better to add the check in the case of misusing.\nAnd because 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'."], "name": "CVE-2021-47650", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "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": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47650\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47650\nhttps://lore.kernel.org/linux-cve-announce/2025022649-CVE-2021-47650-d468@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:17.171367+00:00", "updated": "2025-07-12T22:31:17.171420+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}