# CVE-2021-47047: linux: In the Linux kernel, the following vulnerability has been resolved:  spi: spi-zynqmp-gqspi: return -ENOMEM if dma_map...

CVE-2021-47047 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47047, released February 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47047
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 28, 2024

## 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: [  123.812683]   ISV = 0, ISS = 0x00000145 [  123.816503]   CM = 1, WnR = 1 [  123.819455] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000805047000 [  123.825887] [00000000003fffc0] pgd=0000000803b45003, p4d=0000000803b45003, pud=0000000000000000 [  123.834586] Internal error: Oops: 96000145 [#1] PREEMPT SMP

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47047](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47047.md) | Feb 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47047](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47047.md) | Feb 28, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47047](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47047.md) | Feb 28, 2024 |

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