{"id":"CVE-2021-47650","title":"ASoC: soc-compress: prevent the potentially use of null pointer","summary":"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->sn…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 68a69ad8df959e5211ed4a8e120783b2d352ea74","Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 4639c1d97f385f4784f44d66a3da0672f4951ada","Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < fc237b8d624f4bcb0f21a532627ce4e3b3a85569","Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 08af6da684b44097ea09f1d74d5858b837ed203b","Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < f69a75cb8a98c6c487d620442c68595726a69f60","Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < de2c6f98817fa5decb9b7d3b3a8a3ab864c10588","Linux 5.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:42:28.630527Z"},"published":"2025-02-26","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:49:35.327Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-47650","references":[{"url":"https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74"},{"url":"https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada"},{"url":"https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569"},{"url":"https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b"},{"url":"https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60"},{"url":"https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"}],"tags":["cve.org"],"epss":0.00256,"epssPercentile":0.17296,"ingestedAt":"2026-11-05T22:38:31.559Z","slug":"CVE-2021-47650","body":"## Overview\n\nIn 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'.\n\n## Affected\n\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 68a69ad8df959e5211ed4a8e120783b2d352ea74`\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 4639c1d97f385f4784f44d66a3da0672f4951ada`\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < fc237b8d624f4bcb0f21a532627ce4e3b3a85569`\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < 08af6da684b44097ea09f1d74d5858b837ed203b`\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < f69a75cb8a98c6c487d620442c68595726a69f60`\n- `Linux >= 467fece8fbc6774a3a3bd0981e1a342fb5022706 < de2c6f98817fa5decb9b7d3b3a8a3ab864c10588`\n- `Linux 5.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}