CVE-2026-98342dmaengine: wait for RCU readers before releasing dma_device
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < ac8ce9f89638d6d79875cca7d8ae42566a9bde15
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < 14578c78405d51fa92e4ada4502a45f537c0fcb8
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < cbb3310a5167e868a5e763e32b9a23b4d50669ee
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < 8577a5ec4f7e00443015ef99f646def093121a1b
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < 4448a539a0c39141cccc67be6cacde0f35024313
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < 4aed7e47a10b94ea3c5171e8d1382081accd2e03
- affected 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 – < dc750422170a563c7a81f6e49d36bb02c62ae37f
- affected 2.6.29
- unaffected < 2.6.29
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ac8ce9f89638d6d79875cca7d8ae42566a9bde15 (opens in a new tab)
- https://git.kernel.org/stable/c/14578c78405d51fa92e4ada4502a45f537c0fcb8 (opens in a new tab)
- https://git.kernel.org/stable/c/cbb3310a5167e868a5e763e32b9a23b4d50669ee (opens in a new tab)
- https://git.kernel.org/stable/c/8577a5ec4f7e00443015ef99f646def093121a1b (opens in a new tab)
- https://git.kernel.org/stable/c/4448a539a0c39141cccc67be6cacde0f35024313 (opens in a new tab)
- https://git.kernel.org/stable/c/fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77 (opens in a new tab)
- https://git.kernel.org/stable/c/4aed7e47a10b94ea3c5171e8d1382081accd2e03 (opens in a new tab)
- https://git.kernel.org/stable/c/dc750422170a563c7a81f6e49d36bb02c62ae37f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-93327 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-98342)Record last updated .