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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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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            "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."
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      "product_status:known_affected": "334",
      "product_status:known_not_affected": "369",
      "product_status:recommended": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47650",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47650.json",
      "version": "40"
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.