CVE-2021-47477
comedi: dt9812: fix DMA buffers on stack
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: comedi: dt9812: fix DMA buffers on stack USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail. Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data. Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is.
Timeline
ID reserved
By Linux
Published
- 24 months later
· 24 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 |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.72% · top 46% of all CVEs (7 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 5.3.
Weakness
- CWE-noinfo Not enough information
- CWE-787 (opens in a new tab)All about CWE-787 and its CVEs
Affected products
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < a6af69768d5cb4b2528946d53be5fa19ade37723
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 365a346cda82f51d835c49136a00a9df8a78c7f2
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 8a52bc480992c7c9da3ebfea456af731f50a4b97
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 39ea61037ae78f14fa121228dd962ea3280eacf3
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 3efb7af8ac437085b6c776e5b54830b149d86efe
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 786f5b03450454557ff858a8bead5d7c0cbf78d6
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 3ac273d154d634e2034508a14db82a95d7ad12ed
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 20cebb8b620dc987e55ddc46801de986e081757e
- affected 63274cd7d38a3322d90b66a5bc976de1fb899051 – < 536de747bc48262225889a533db6650731ab25d3
- affected 2.6.29
- unaffected < 2.6.29
- unaffected 4.4.292 – ≤ 4.4.*
- unaffected 4.9.290 – ≤ 4.9.*
- unaffected 4.14.255 – ≤ 4.14.*
- unaffected 4.19.217 – ≤ 4.19.*
- unaffected 5.4.159 – ≤ 5.4.*
- unaffected 5.10.79 – ≤ 5.10.*
- unaffected 5.14.18 – ≤ 5.14.*
- unaffected 5.15.2 – ≤ 5.15.*
- unaffected 5.16 – ≤ *
References (9)
- https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3 (opens in a new tab)x_transferred
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)
- 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://trackcve.app/cve/CVE-2021-47477)Record last updated .