# CVE-2022-50145: linux: In the Linux kernel, the following vulnerability has been resolved:  dmaengine: sf-pdma: Add multithread support for...

CVE-2022-50145 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50145, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50145
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 18, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  dmaengine: sf-pdma: Add multithread support for a DMA channel  When we get a DMA channel and try to use it in multiple threads it will cause oops and hanging the system.  % echo 64 > /sys/module/dmatest/parameters/threads_per_chan % echo 10000 > /sys/module/dmatest/parameters/iterations % echo 1 > /sys/module/dmatest/parameters/run [   89.480664] Unable to handle kernel NULL pointer dereference at virtual                address 00000000000000a0 [   89.488725] Oops [#1] [   89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted                5.17.0-rc5 [   89.509385] epc : vchan_find_desc+0x32/0x46 [   89.513553]  ra : sf_pdma_tx_status+0xca/0xd6  This happens because of data race. Each thread rewrite channels's descriptor as soon as device_prep_dma_memcpy() is called. It leads to the situation when the driver thinks that it uses right descriptor that actually is freed or substituted for other one.  With current fixes a descriptor changes its value only when it has been used. A new descriptor is acquired from vc->desc_issued queue that is already filled with descriptors that are ready to be sent. Threads have no direct access to DMA channel descriptor. Now it is just possible to queue a descriptor for further processing.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-50145](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50145.md) | Jun 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-50145](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50145.md) | Jun 18, 2025 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-50145](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50145.md) | Jun 18, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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