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CVE-2026-98344— dmaengine: Fix device kref underflow in dma_chan_put()

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 dma_chan_put() 中的设备 kref 下溢问题 dma_chan_get() 仅在慢速路径上获取 chan->device->ref： dma_chan_put() 无条件地释放引用计数，因此每个快速路径的 get/put 配对都会额外减少一次设备引用计数。 当同时满足以下两个条件时，该漏洞会被触发：非私有的提供程序有一个持久客户端持有 chan->client_count > 0，且另一个客户端循环执行 dmaengine_get()

AI Predicted 5.3 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8ad342a863590b24ce77681b7e081363fb3333f7< 036b527f92570206da4b8c40b38f8d689e29d0f3 affected
8ad342a863590b24ce77681b7e081363fb3333f7< 5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef affected
8ad342a863590b24ce77681b7e081363fb3333f7< 57f7f1c6827be7d8f80feca48d2125fb91c6f6ed affected
8ad342a863590b24ce77681b7e081363fb3333f7< 7c3f4ce651d43705f9ec7f778f642a90d5ff4fba affected
8ad342a863590b24ce77681b7e081363fb3333f7< de2677e57d3161390d8a508f08cddec6ef7e4b23 affected
8ad342a863590b24ce77681b7e081363fb3333f7< 1a0d9b406febf23054ad595fd47b29325e70fb2d affected
8ad342a863590b24ce77681b7e081363fb3333f7< 77906ac448d2fa81fa710ae26c0e591ebdc81154 affected
8ad342a863590b24ce77681b7e081363fb3333f7< 44dab659064eb5c10adb0306510eebe848ed592d affected
… +10 more rows
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I. Basic Information for CVE-2026-98344

Vulnerability Information
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Vulnerability Title
dmaengine: Fix device kref underflow in dma_chan_put()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: Fix device kref underflow in dma_chan_put() dma_chan_get() takes chan->device->ref only on the slow path: /* no kref on fast path */ if (chan->client_count) { __module_get(owner); chan->client_count++; return 0; } if (!try_module_get(owner)) return -ENODEV; if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero() dma_chan_put() drops the ref unconditionally, so every fast-path get/put pair drops one extra device reference. The bug fires when two conditions hold together: a non-private provider has a persistent client holding chan->client_count > 0 and another client cycles dmaengine_get()/dmaengine_put(). When the kref hits zero, the subsequent dma_find_channel() returns NULL even though the provider module is still loaded. Fix this by dropping device->ref only on the last put, matching the single slow-path get.
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 ~ 036b527f92570206da4b8c40b38f8d689e29d0f3 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-98344

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III. Intelligence Information for CVE-2026-98344

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Patches & Fixes for CVE-2026-98344 (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

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