CVE-2021-47650 (GCVE-0-2021-47650)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-11 13:58
VLAI?
Title
ASoC: soc-compress: prevent the potentially use of null pointer
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-compress: prevent the potentially use of null pointer There is one call trace that snd_soc_register_card() ->snd_soc_bind_card()->soc_init_pcm_runtime() ->snd_soc_dai_compress_new()->snd_soc_new_compress(). In the trace the 'codec_dai' transfers from card->dai_link, and we can see from the snd_soc_add_pcm_runtime() in snd_soc_bind_card() that, if value of card->dai_link->num_codecs is 0, then 'codec_dai' could be null pointer caused by index out of bound in 'asoc_rtd_to_codec(rtd, 0)'. And snd_soc_register_card() is called by various platforms. Therefore, it is better to add the check in the case of misusing. And because 'cpu_dai' has already checked in soc_init_pcm_runtime(), there is no need to check again. Adding the check as follow, then if 'codec_dai' is null, snd_soc_new_compress() will not pass through the check 'if (playback + capture != 1)', avoiding the leftover use of 'codec_dai'.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < 68a69ad8df959e5211ed4a8e120783b2d352ea74 (git)
Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < 4639c1d97f385f4784f44d66a3da0672f4951ada (git)
Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < fc237b8d624f4bcb0f21a532627ce4e3b3a85569 (git)
Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < 08af6da684b44097ea09f1d74d5858b837ed203b (git)
Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < f69a75cb8a98c6c487d620442c68595726a69f60 (git)
Affected: 467fece8fbc6774a3a3bd0981e1a342fb5022706 , < de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.189 , ≤ 5.4.* (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47650\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T06:37:06.780\",\"lastModified\":\"2025-09-23T18:47:36.830\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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-\u003esnd_soc_bind_card()-\u003esoc_init_pcm_runtime()\\n-\u003esnd_soc_dai_compress_new()-\u003esnd_soc_new_compress().\\nIn the trace the \u0027codec_dai\u0027 transfers from card-\u003edai_link,\\nand we can see from the snd_soc_add_pcm_runtime() in\\nsnd_soc_bind_card() that, if value of card-\u003edai_link-\u003enum_codecs\\nis 0, then \u0027codec_dai\u0027 could be null pointer caused\\nby index out of bound in \u0027asoc_rtd_to_codec(rtd, 0)\u0027.\\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 \u0027cpu_dai\u0027 has already checked in soc_init_pcm_runtime(),\\nthere is no need to check again.\\nAdding the check as follow, then if \u0027codec_dai\u0027 is null,\\nsnd_soc_new_compress() will not pass through the check\\n\u0027if (playback + capture != 1)\u0027, avoiding the leftover use of\\n\u0027codec_dai\u0027.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: soc-compress: evita el posible uso de un puntero nulo Hay un seguimiento de llamada que snd_soc_register_card() -\u0026gt;snd_soc_bind_card()-\u0026gt;soc_init_pcm_runtime() -\u0026gt;snd_soc_dai_compress_new()-\u0026gt;snd_soc_new_compress(). En el seguimiento, \u0027codec_dai\u0027 se transfiere desde card-\u0026gt;dai_link, y podemos ver desde snd_soc_add_pcm_runtime() en snd_soc_bind_card() que, si el valor de card-\u0026gt;dai_link-\u0026gt;num_codecs es 0, entonces \u0027codec_dai\u0027 podr\u00eda ser un puntero nulo causado por un \u00edndice fuera de los l\u00edmites en \u0027asoc_rtd_to_codec(rtd, 0)\u0027. 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 \u0027cpu_dai\u0027 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 \u0027codec_dai\u0027 es nulo, snd_soc_new_compress() no pasar\u00e1 la verificaci\u00f3n \u0027if (playback + capture != 1)\u0027, lo que evita el uso sobrante de \u0027codec_dai\u0027.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4\",\"versionEndExcluding\":\"5.4.189\",\"matchCriteriaId\":\"80DDFBB5-E7D8-4F00-9608-47CCB8D46CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.110\",\"matchCriteriaId\":\"91D3BFD0-D3F3-4018-957C-96CCBF357D79\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.33\",\"matchCriteriaId\":\"27C42AE8-B387-43E2-938A-E1C8B40BE6D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.19\",\"matchCriteriaId\":\"20C43679-0439-405A-B97F-685BEE50613B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"5.17.2\",\"matchCriteriaId\":\"210C679C-CF84-44A3-8939-E629C87E54BF\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.