VulnerabilityPublished 6 Oct 2026Updated 19 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e873c74132f0c5f1452816cd9bb26208f0bba1e1 : patch Linux kernel soon.

Data as of 26 Oct 2026, 16:39 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e873c74132f0c5f1452816cd9bb26208f0bba1e1, c9780b601438137494b407eb4301bb3de2587ac9, b92c502595336a3cc5bb7a060170891366745a5d +5

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < e873c74132f0c5f1452816cd9bb26208f0bba1e1	Fixed in e873c74132f0c5f1452816cd9bb26208f0bba1e1
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < c9780b601438137494b407eb4301bb3de2587ac9	Fixed in c9780b601438137494b407eb4301bb3de2587ac9
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < b92c502595336a3cc5bb7a060170891366745a5d	Fixed in b92c502595336a3cc5bb7a060170891366745a5d
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 855187a88bdf762c46b6849307597e3e02bfc1d9	Fixed in 855187a88bdf762c46b6849307597e3e02bfc1d9
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 9319dd64d5cdef851841c091f30424faa2284c31	Fixed in 9319dd64d5cdef851841c091f30424faa2284c31
LinuxLinux	Affected ≥ 8ad342a863590b24ce77681b7e081363fb3333f7, < 07eb075b60d565a5e465a1945a80cc62807492ad	Fixed in 07eb075b60d565a5e465a1945a80cc62807492ad

AI-suggested

A fix has been implemented and is available in the Linux kernel commits identified by the fixedVersions hashes. Users should update their Linux kernel to a version including these commits to remediate the vulnerability.

Description

A use-after-free vulnerability was identified and fixed in the Linux kernel's dmaengine subsystem affecting version 5.6. The flaw occurs when dma_device_put() drops the last reference to a dma_device, potentially freeing it and its channels, but dma_chan_put() still accesses freed memory. This can lead to a kernel memory safety issue detected by KASAN.

Impact

This vulnerability causes a use-after-free condition in kernel memory, which can lead to kernel crashes or undefined behavior. Although no active exploitation is reported, such memory safety issues can be leveraged for privilege escalation or denial of service.

Summary

The Linux kernel dmaengine subsystem had a use-after-free vulnerability in dma_chan_put() and dma_release_channel(). When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() may free the dma_device and its channels. However, dma_chan_put() subsequently reads chan->device->owner for a module_put(), accessing freed memory. The fix involves caching the module owner in dma_chan_put() before the put operation to avoid accessing freed memory.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 11:38 UTC

Technical details

References

Community reviews

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