CVE-2021-47047
5.5 · MEDIUMOverview
CVE-2021-47047 is a medium-severity vulnerability affecting linux linux_kernel. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
spi: spi-zynqmp-gqspi: return -ENOMEM if dma_map_single fails
The spi controller supports 44-bit address space on AXI in DMA mode,
so set dma_addr_t width to 44-bit to avoid using a swiotlb mapping.
In addition, if dma_map_single fails, it should return immediately
instead of continuing doing the DMA operation which bases on invalid
address.
This fixes the following crash which occurs in reading a big block
from flash:
[ 123.633577] zynqmp-qspi ff0f0000.spi: swiotlb buffer is full (sz: 4194304 bytes), total 32768 (slots), used 0 (slots)
[ 123.644230] zynqmp-qspi ff0f0000.spi: ERR:rxdma:memory not mapped
[ 123.784625] Unable to handle kernel paging request at virtual address 00000000003fffc0
[ 123.792536] Mem abort info:
[ 123.795313] ESR = 0x96000145
[ 123.798351] EC = 0x25: DABT (current EL), IL = 32 bits
[ 123.803655] SET = 0, FnV = 0
[ 123.806693] EA = 0, S1PTW = 0
[ 123.809818] Data abort info:
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 5.10, < 5.10.37 | Affected |
References
Frequently Asked Questions
What is CVE-2021-47047?
CVE-2021-47047 is a medium-severity vulnerability affecting linux linux_kernel. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47047?
This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-47047?
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-47047?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-47047 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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