CVE-2021-47650ASoC: soc-compress: prevent the potentially use of null pointer
- 5.5MediumCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 83% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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'.
Timeline
ID reserved
By Linux
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 83% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < 68a69ad8df959e5211ed4a8e120783b2d352ea74
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < 4639c1d97f385f4784f44d66a3da0672f4951ada
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < fc237b8d624f4bcb0f21a532627ce4e3b3a85569
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < 08af6da684b44097ea09f1d74d5858b837ed203b
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < f69a75cb8a98c6c487d620442c68595726a69f60
- affected 467fece8fbc6774a3a3bd0981e1a342fb5022706 – < de2c6f98817fa5decb9b7d3b3a8a3ab864c10588
- affected 5.4
- unaffected < 5.4
- unaffected 5.4.189 – ≤ 5.4.*
- unaffected 5.10.110 – ≤ 5.10.*
- unaffected 5.15.33 – ≤ 5.15.*
- unaffected 5.16.19 – ≤ 5.16.*
- unaffected 5.17.2 – ≤ 5.17.*
- unaffected 5.18 – ≤ *
References
References6
- https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 (opens in a new tab)
- https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada (opens in a new tab)
- https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569 (opens in a new tab)
- https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b (opens in a new tab)
- https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 (opens in a new tab)
- https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34655 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47650)Record last updated .