CVE-2026-98342 is a vulnerability in Linux Kernel
Published on October 6, 2026
dmaengine: wait for RCU readers before releasing dma_device
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: wait for RCU readers before releasing dma_device
dma_issue_pending_all() walks the dma_device_list with
list_for_each_entry_rcu() under rcu_read_lock(). dma_device_release()
unlinks the device with list_del_rcu() and then calls
device->device_release() (which in many drivers, such as plx_dma.c,
directly calls kfree()).
Because there is no grace period between unlinking the device and
freeing it, concurrent RCU readers in dma_issue_pending_all() can
access the device after it has been freed.
The lockless walk originally relied on clients holding a dmaengine
reference to pin the provider module, and therefore the device, for as
long as they might traverse the list. Commit 8ad342a86359 ("dmaengine:
Add reference counting to dma_device struct") decoupled the dma_device
lifetime from the module reference, so the device can now be released
while a reader is still walking the list.
Add synchronize_rcu() before the device is freed, so RCU readers are
guaranteed to have finished. Keep it unconditional: providers that do
not implement device_release() free the device themselves once
dma_async_device_unregister() returns. This call will delay for a grace
period with dma_list_mutex held, which is safe and only teardown path is
delayed.
Products Associated with CVE-2026-98342
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Affected Versions
Linux:- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below ac8ce9f89638d6d79875cca7d8ae42566a9bde15 is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below 14578c78405d51fa92e4ada4502a45f537c0fcb8 is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below cbb3310a5167e868a5e763e32b9a23b4d50669ee is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below 8577a5ec4f7e00443015ef99f646def093121a1b is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below 4448a539a0c39141cccc67be6cacde0f35024313 is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77 is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below 4aed7e47a10b94ea3c5171e8d1382081accd2e03 is affected.
- Version 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 and below dc750422170a563c7a81f6e49d36bb02c62ae37f is affected.
- Version 2.6.29 is affected.
- Before 2.6.29 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.112, <= 6.12.* is unaffected.
- Version 6.18.54, <= 6.18.* is unaffected.
- Version 7.2.8, <= 7.2.* is unaffected.
- Version 7.3-rc4, <= * is unaffected.