What’s Vulnerable › Vulnerabilities

CVE-2026-98343: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.6 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/02bd02c585293634b213b142cba63cbf77891f6b
• https://git.kernel.org/stable/c/07eb075b60d565a5e465a1945a80cc62807492ad
• https://git.kernel.org/stable/c/6cf31716b77a71c0d634106f4f3951377b8dc6dc
• https://git.kernel.org/stable/c/855187a88bdf762c46b6849307597e3e02bfc1d9
• https://git.kernel.org/stable/c/9319dd64d5cdef851841c091f30424faa2284c31
• https://git.kernel.org/stable/c/b92c502595336a3cc5bb7a060170891366745a5d
• https://git.kernel.org/stable/c/c9780b601438137494b407eb4301bb3de2587ac9
• https://git.kernel.org/stable/c/e873c74132f0c5f1452816cd9bb26208f0bba1e1

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