CVE-2021-47477
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.72% probability · 52th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757ePatch
- https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2Patch
- https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3Patch
- https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12edPatch
- https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efePatch
- https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3Patch
- https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6Patch
- https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97Patch
- https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723Patch
- https://git.kernel.org/stable/c/20cebb8b620dc987e55ddc46801de986e081757ePatch
- https://git.kernel.org/stable/c/365a346cda82f51d835c49136a00a9df8a78c7f2Patch
- https://git.kernel.org/stable/c/39ea61037ae78f14fa121228dd962ea3280eacf3Patch
- https://git.kernel.org/stable/c/3ac273d154d634e2034508a14db82a95d7ad12edPatch
- https://git.kernel.org/stable/c/3efb7af8ac437085b6c776e5b54830b149d86efePatch
- https://git.kernel.org/stable/c/536de747bc48262225889a533db6650731ab25d3Patch
- https://git.kernel.org/stable/c/786f5b03450454557ff858a8bead5d7c0cbf78d6Patch
- https://git.kernel.org/stable/c/8a52bc480992c7c9da3ebfea456af731f50a4b97Patch
- https://git.kernel.org/stable/c/a6af69768d5cb4b2528946d53be5fa19ade37723Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.