CVE-2021-47477
comedi: dt9812: fix DMA buffers on stack
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.29
References 9
git.kernel.org
- stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723
- stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2
- stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97
- stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3
- stable/c/3efb7af8ac437085b6c776e5b54830b149d86efe
- stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6
- stable/c/3ac273d154d634e2034508a14db82a95d7ad12ed
- stable/c/20cebb8b620dc987e55ddc46801de986e081757e
- stable/c/536de747bc48262225889a533db6650731ab25d3