CVE-2026-98343: Linux kernel · dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:28 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- ubuntu.com/security/CVE-2026-98343 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98343 (opens in a new tab)
- git.kernel.org/linus/e873c74132f0c5f1452816cd9bb26208f0bba1e1 (opens in a new tab)
- git.kernel.org/stable/c/02bd02c585293634b213b142cba63cbf77891f6b (opens in a new tab)
- git.kernel.org/stable/c/07eb075b60d565a5e465a1945a80cc62807492ad (opens in a new tab)
- git.kernel.org/stable/c/6cf31716b77a71c0d634106f4f3951377b8dc6dc (opens in a new tab)
- git.kernel.org/stable/c/855187a88bdf762c46b6849307597e3e02bfc1d9 (opens in a new tab)
- git.kernel.org/stable/c/9319dd64d5cdef851841c091f30424faa2284c31 (opens in a new tab)
- git.kernel.org/stable/c/b92c502595336a3cc5bb7a060170891366745a5d (opens in a new tab)
- git.kernel.org/stable/c/c9780b601438137494b407eb4301bb3de2587ac9 (opens in a new tab)
- git.kernel.org/stable/c/e873c74132f0c5f1452816cd9bb26208f0bba1e1 (opens in a new tab)