CVE-2025-71221
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Linux kernel Affected 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 6.19 | Affected | — |
| — | Affected | 6.18.10 |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.85-1 |
| sid | Fixed | 6.18.10-1 |
| forky | Fixed | 6.18.10-1 |
| bullseye | Fixed | 6.1.170-1~deb11u1 |
| bookworm | Fixed | 6.1.170-1 |
References
- https://www.suse.com/security/cve/CVE-2025-71221.html
- https://security-tracker.debian.org/tracker/CVE-2025-71221
- https://git.kernel.org/stable/c/3f0e0e2d9e752570041e95fd04635e2580097819
- https://git.kernel.org/stable/c/9f665b3c3d9a168410251f27a5d019b7bf93185c
- https://git.kernel.org/stable/c/a143545855bc2c6e1330f6f57ae375ac44af00a7
- https://git.kernel.org/stable/c/dfb5e05227745de43b7fd589721817a4337c970d
- https://git.kernel.org/stable/c/eba0c75670c022cb1f948600db972524bcfe8166
- https://git.kernel.org/stable/c/fc023b8fab057f0c910856ff36d3e12a30b7af4a
CWEs
CWE-362
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.