CVE-2025-71221High· 7.8▾ TwilightIn 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 des…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.10%
0.10% → 0.1%
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.
Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 3f0e0e2d9e752570041e95fd04635e2580097819Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < dfb5e05227745de43b7fd589721817a4337c970dLinux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < eba0c75670c022cb1f948600db972524bcfe8166Linux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < fc023b8fab057f0c910856ff36d3e12a30b7af4aLinux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < 9f665b3c3d9a168410251f27a5d019b7bf93185cLinux >= 1b38da264674d6a0fe26a63996b8f88b88c3da48 < a143545855bc2c6e1330f6f57ae375ac44af00a7Linux 3.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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