# CVE-2025-71221: linux: In the Linux kernel, the following vulnerability has been resolved:  dmaengine: mmp_pdma: Fix race condition in mmp_p...

CVE-2025-71221 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71221, released February 14, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-71221
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 14, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()  Add proper locking in mmp_pdma_residue() to prevent use-after-free when accessing descriptor list and descriptor contents.  The race occurs when multiple threads call tx_status() while the tasklet on another CPU is freeing completed descriptors:  CPU 0                              CPU 1 -----                              ----- mmp_pdma_tx_status() mmp_pdma_residue()   -> NO LOCK held      list_for_each_entry(sw, ..)                                    DMA interrupt                                    dma_do_tasklet()                                      -> spin_lock(&desc_lock)                                         list_move(sw->node, ...)                                         spin_unlock(&desc_lock)   |                                     dma_pool_free(sw) <- FREED!   -> access sw->desc <- UAF!  This issue can be reproduced when running dmatest on the same channel with multiple threads (threads_per_chan > 1).  Fix by protecting the chain_running list iteration and descriptor access with the chan->desc_lock spinlock.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.170-1 | [DEBIAN-CVE-2025-71221](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71221.md) | Feb 14, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2025-71221](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71221.md) | Feb 14, 2026 |
| Linux | linux Debian 14 | 6.18.10-1 | [DEBIAN-CVE-2025-71221](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71221.md) | Feb 14, 2026 |

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Data as of 2026-11-09T13:31:49Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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