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dmaengine: wait for RCU readers before releasing dma_device

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98342

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98342

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "ac8ce9f89638d6d79875cca7d8ae42566a9bde15",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "14578c78405d51fa92e4ada4502a45f537c0fcb8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "cbb3310a5167e868a5e763e32b9a23b4d50669ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "8577a5ec4f7e00443015ef99f646def093121a1b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "4448a539a0c39141cccc67be6cacde0f35024313",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "4aed7e47a10b94ea3c5171e8d1382081accd2e03",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2ba05622b8b143b0c95968ba59bddfbd6d2f2559",
        "lessThan": "dc750422170a563c7a81f6e49d36bb02c62ae37f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/dma/dmaengine.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/dma/dmaengine.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98342

Source reference: /cveMetadata/cveId

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Event
#38421 · Revision 1
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