Linux Kernel up to 7.3-rc3 dmaengine dma_chan_put use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. Affected by this issue is the function dma_chan_put of the component dmaengine. Performing a manipulation results in use after free. This vulnerability is known as CVE-2026-98343. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. This affects the function dma_chan_put of the component dmaengine. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98343 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/06/2026).

Upgrading to version 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch b92c502595336a3cc5bb7a060170891366745a5d/855187a88bdf762c46b6849307597e3e02bfc1d9/c9780b601438137494b407eb4301bb3de2587ac9/07eb075b60d565a5e465a1945a80cc62807492ad/9319dd64d5cdef851841c091f30424faa2284c31/6cf31716b77a71c0d634106f4f3951377b8dc6dc/e873c74132f0c5f1452816cd9bb26208f0bba1e1 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.271/5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: b92c502595336a3cc5bb7a060170891366745a5d/855187a88bdf762c46b6849307597e3e02bfc1d9/c9780b601438137494b407eb4301bb3de2587ac9/07eb075b60d565a5e465a1945a80cc62807492ad/9319dd64d5cdef851841c091f30424faa2284c31/6cf31716b77a71c0d634106f4f3951377b8dc6dc/e873c74132f0c5f1452816cd9bb26208f0bba1e1

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98343 (🔒)
GCVE (CVE): GCVE-0-2026-98343
GCVE (VulDB): GCVE-100-414195

Entryinfo

Created: 10/06/2026 13:34
Changes: 10/06/2026 13:34 (59)
Complete: 🔍
Cache ID: 216::103

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