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CVE-2026-98342— dmaengine: wait for RCU readers before releasing dma_device

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：在释放 dma_device 之前等待 RCU 读者完成 函数在 保护下，使用 遍历 链表。而 函数首先通过 从链表中移除设备，然后调用 （在许多驱动程序中，例如 ，该函数直接调用 释放内存）。 由于在移除设备和释放其内存之间没有设置 RCU 宽限期（grace period）， 中并发的 RCU 读者可能在设备被释放后仍然访问该设备，导致 Use-After-Free（释放后使用）漏洞。 最初的无锁遍历依赖于客户端持有对 dmaengine 模块的引用

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2ba05622b8b143b0c95968ba59bddfbd6d2f2559< ac8ce9f89638d6d79875cca7d8ae42566a9bde15 affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< 14578c78405d51fa92e4ada4502a45f537c0fcb8 affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< cbb3310a5167e868a5e763e32b9a23b4d50669ee affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< 8577a5ec4f7e00443015ef99f646def093121a1b affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< 4448a539a0c39141cccc67be6cacde0f35024313 affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77 affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< 4aed7e47a10b94ea3c5171e8d1382081accd2e03 affected
2ba05622b8b143b0c95968ba59bddfbd6d2f2559< dc750422170a563c7a81f6e49d36bb02c62ae37f affected
… +10 more rows
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I. Basic Information for CVE-2026-98342

Vulnerability Information
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Vulnerability Title
dmaengine: wait for RCU readers before releasing dma_device
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: wait for RCU readers before releasing dma_device dma_issue_pending_all() walks the dma_device_list with list_for_each_entry_rcu() under rcu_read_lock(). dma_device_release() unlinks the device with list_del_rcu() and then calls device->device_release() (which in many drivers, such as plx_dma.c, directly calls kfree()). Because there is no grace period between unlinking the device and freeing it, concurrent RCU readers in dma_issue_pending_all() can access the device after it has been freed. The lockless walk originally relied on clients holding a dmaengine reference to pin the provider module, and therefore the device, for as long as they might traverse the list. Commit 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") decoupled the dma_device lifetime from the module reference, so the device can now be released while a reader is still walking the list. Add synchronize_rcu() before the device is freed, so RCU readers are guaranteed to have finished. Keep it unconditional: providers that do not implement device_release() free the device themselves once dma_async_device_unregister() returns. This call will delay for a grace period with dma_list_mutex held, which is safe and only teardown path is delayed.
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 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 ~ ac8ce9f89638d6d79875cca7d8ae42566a9bde15 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2026-98342

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III. Intelligence Information for CVE-2026-98342

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Patches & Fixes for CVE-2026-98342 (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-2026-98342

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