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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： dmaengine：修复 和 中的使用-after-free 漏洞 当 释放对 的最后一个引用时， 会被执行，并可能同时释放 及其关联的通道（channel）。 随后， 仍会通过 读取 ，以完成后续的 操作。KASAN（内核地址 sanitized）检测到此问题，错误信息如下： 为解决此问题，在 中，在执行引用计数递减（put）操作之前，先将模块所有者（module owner）缓存起来，从而使后续的 不再需要访问 。

AI Predicted 4.4 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8ad342a863590b24ce77681b7e081363fb3333f7< b92c502595336a3cc5bb7a060170891366745a5d affected
8ad342a863590b24ce77681b7e081363fb3333f7< 855187a88bdf762c46b6849307597e3e02bfc1d9 affected
8ad342a863590b24ce77681b7e081363fb3333f7< c9780b601438137494b407eb4301bb3de2587ac9 affected
8ad342a863590b24ce77681b7e081363fb3333f7< 07eb075b60d565a5e465a1945a80cc62807492ad affected
8ad342a863590b24ce77681b7e081363fb3333f7< 9319dd64d5cdef851841c091f30424faa2284c31 affected
8ad342a863590b24ce77681b7e081363fb3333f7< 6cf31716b77a71c0d634106f4f3951377b8dc6dc affected
8ad342a863590b24ce77681b7e081363fb3333f7< 02bd02c585293634b213b142cba63cbf77891f6b affected
8ad342a863590b24ce77681b7e081363fb3333f7< e873c74132f0c5f1452816cd9bb26208f0bba1e1 affected
… +10 more rows
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I. Basic Information for CVE-2026-98343

Vulnerability Information
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Vulnerability Title
dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8ad342a863590b24ce77681b7e081363fb3333f7 ~ b92c502595336a3cc5bb7a060170891366745a5d -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-98343

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III. Intelligence Information for CVE-2026-98343

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Patches & Fixes for CVE-2026-98343 (8)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98281 7.8 HIGH futex: Also allocate private hash on vfork()
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98343

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