HighFix available

dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.15.209, 6.1.167, 6.12.78, 6.18.10, 6.6.130
CVEs: CVE-2025-71221
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 19:49 UTC · Revision 1

Source evidence

dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()

core-osv · Original source

Published 14 Feb 2026, 16:27 UTC

osv:CVE-2025-71221

Kernel

Fixed versions: 5.15.209, 6.1.167, 6.6.130, 6.12.78, 6.18.10

Complete source record

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  "url": "https://osv.dev/vulnerability/CVE-2025-71221",
  "method": "structured",
  "payload": {
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    "title": "dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()",
    "summary": "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.",
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      "modified": "2026-10-28T02:30:23.028477132Z",
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}