CVE-2026-98343

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

State: Published
Severity: Not scored
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8ad342a863590b24ce77681b7e081363fb3333f7 to before b92c502595336a3cc5bb7a060170891366745a5dAffected 8ad342a863590b24ce77681b7e081363fb3333f7 to before 855187a88bdf762c46b6849307597e3e02bfc1d9Affected 8ad342a863590b24ce77681b7e081363fb3333f7 to before c9780b601438137494b407eb4301bb3de2587ac9Affected 8ad342a863590b24ce77681b7e081363fb3333f7 to before 07eb075b60d565a5e465a1945a80cc62807492adAffected 8ad342a863590b24ce77681b7e081363fb3333f7 to before 9319dd64d5cdef851841c091f30424faa2284c31Affected 8ad342a863590b24ce77681b7e081363fb3333f7 to before 6cf31716b77a71c0d634106f4f3951377b8dc6dcAffected 8ad342a863590b24ce77681b7e081363fb3333f7 to before 02bd02c585293634b213b142cba63cbf77891f6bAffected 8ad342a863590b24ce77681b7e081363fb3333f7 to before e873c74132f0c5f1452816cd9bb26208f0bba1e1Affected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

8ad342a863590b24ce77681b7e081363fb3333f7 to before b92c502595336a3cc5bb7a060170891366745a5dAffected
8ad342a863590b24ce77681b7e081363fb3333f7 to before 855187a88bdf762c46b6849307597e3e02bfc1d9Affected
8ad342a863590b24ce77681b7e081363fb3333f7 to before c9780b601438137494b407eb4301bb3de2587ac9Affected
8ad342a863590b24ce77681b7e081363fb3333f7 to before 07eb075b60d565a5e465a1945a80cc62807492adAffected
8ad342a863590b24ce77681b7e081363fb3333f7 to before 9319dd64d5cdef851841c091f30424faa2284c31Affected
8ad342a863590b24ce77681b7e081363fb3333f7 to before 6cf31716b77a71c0d634106f4f3951377b8dc6dcAffected
8ad342a863590b24ce77681b7e081363fb3333f7 to before 02bd02c585293634b213b142cba63cbf77891f6bAffected
8ad342a863590b24ce77681b7e081363fb3333f7 to before e873c74132f0c5f1452816cd9bb26208f0bba1e1Affected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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