dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()

Summary

In the Linux kernel, the following vulnerability has been resolved: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device.

Timeline

1. Oct 6, 2026, 8:46 AM UTCCVE published
2. Oct 19, 2026, 9:17 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in b92c502595336a3cc5bb7a060170891366745a5d; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in 855187a88bdf762c46b6849307597e3e02bfc1d9; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in c9780b601438137494b407eb4301bb3de2587ac9; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in 07eb075b60d565a5e465a1945a80cc62807492ad; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in 9319dd64d5cdef851841c091f30424faa2284c31; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in 6cf31716b77a71c0d634106f4f3951377b8dc6dc; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in 02bd02c585293634b213b142cba63cbf77891f6b; From 8ad342a863590b24ce77681b7e081363fb3333f7 · fixed in e873c74132f0c5f1452816cd9bb26208f0bba1e1

• Linux Linux

  5.6

• KernelLinux

  From 5.6.0 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8