{"id":"CVE-2026-98342","state":"PUBLISHED","title":"dmaengine: wait for RCU readers before releasing dma_device","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: wait for RCU readers before releasing dma_device\n\ndma_issue_pending_all() walks the dma_device_list with\nlist_for_each_entry_rcu() under rcu_read_lock(). dma_device_release()\nunlinks the device with list_del_rcu() and then calls\ndevice->device_release() (which in many drivers, such as plx_dma.c,\ndirectly calls kfree()).\n\nBecause there is no grace period between unlinking the device and\nfreeing it, concurrent RCU readers in dma_issue_pending_all() can\naccess the device after it has been freed.\n\nThe lockless walk originally relied on clients holding a dmaengine\nreference to pin the provider module, and therefore the device, for as\nlong as they might traverse the list. Commit 8ad342a86359 (\"dmaengine:\nAdd reference counting to dma_device struct\") decoupled the dma_device\nlifetime from the module reference, so the device can now be released\nwhile a reader is still walking the list.\n\nAdd synchronize_rcu() before the device is freed, so RCU readers are\nguaranteed to have finished. Keep it unconditional: providers that do\nnot implement device_release() free the device themselves once\ndma_async_device_unregister() returns. This call will delay for a grace\nperiod with dma_list_mutex held, which is safe and only teardown path is\ndelayed.","publishedAt":"2026-10-06T08:46:32.366Z","updatedAt":"2026-10-19T09:17:53.321Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"ac8ce9f89638d6d79875cca7d8ae42566a9bde15","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"14578c78405d51fa92e4ada4502a45f537c0fcb8","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"cbb3310a5167e868a5e763e32b9a23b4d50669ee","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"8577a5ec4f7e00443015ef99f646def093121a1b","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"4448a539a0c39141cccc67be6cacde0f35024313","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"4aed7e47a10b94ea3c5171e8d1382081accd2e03","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"dc750422170a563c7a81f6e49d36bb02c62ae37f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]}],"references":["https://git.kernel.org/stable/c/ac8ce9f89638d6d79875cca7d8ae42566a9bde15","https://git.kernel.org/stable/c/14578c78405d51fa92e4ada4502a45f537c0fcb8","https://git.kernel.org/stable/c/cbb3310a5167e868a5e763e32b9a23b4d50669ee","https://git.kernel.org/stable/c/8577a5ec4f7e00443015ef99f646def093121a1b","https://git.kernel.org/stable/c/4448a539a0c39141cccc67be6cacde0f35024313","https://git.kernel.org/stable/c/fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","https://git.kernel.org/stable/c/4aed7e47a10b94ea3c5171e8d1382081accd2e03","https://git.kernel.org/stable/c/dc750422170a563c7a81f6e49d36bb02c62ae37f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98342.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98342","state":"PUBLISHED","datePublished":"2026-10-06T08:46:32.366Z","dateUpdated":"2026-10-19T09:17:53.321Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.342Z"},"containers":{"cna":{"title":"dmaengine: wait for RCU readers before releasing dma_device","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: wait for RCU readers before releasing dma_device\n\ndma_issue_pending_all() walks the dma_device_list with\nlist_for_each_entry_rcu() under rcu_read_lock(). dma_device_release()\nunlinks the device with list_del_rcu() and then calls\ndevice->device_release() (which in many drivers, such as plx_dma.c,\ndirectly calls kfree()).\n\nBecause there is no grace period between unlinking the device and\nfreeing it, concurrent RCU readers in dma_issue_pending_all() can\naccess the device after it has been freed.\n\nThe lockless walk originally relied on clients holding a dmaengine\nreference to pin the provider module, and therefore the device, for as\nlong as they might traverse the list. Commit 8ad342a86359 (\"dmaengine:\nAdd reference counting to dma_device struct\") decoupled the dma_device\nlifetime from the module reference, so the device can now be released\nwhile a reader is still walking the list.\n\nAdd synchronize_rcu() before the device is freed, so RCU readers are\nguaranteed to have finished. Keep it unconditional: providers that do\nnot implement device_release() free the device themselves once\ndma_async_device_unregister() returns. This call will delay for a grace\nperiod with dma_list_mutex held, which is safe and only teardown path is\ndelayed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"ac8ce9f89638d6d79875cca7d8ae42566a9bde15","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"14578c78405d51fa92e4ada4502a45f537c0fcb8","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"cbb3310a5167e868a5e763e32b9a23b4d50669ee","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"8577a5ec4f7e00443015ef99f646def093121a1b","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"4448a539a0c39141cccc67be6cacde0f35024313","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"4aed7e47a10b94ea3c5171e8d1382081accd2e03","versionType":"git"},{"version":"2ba05622b8b143b0c95968ba59bddfbd6d2f2559","status":"affected","lessThan":"dc750422170a563c7a81f6e49d36bb02c62ae37f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ac8ce9f89638d6d79875cca7d8ae42566a9bde15"},{"url":"https://git.kernel.org/stable/c/14578c78405d51fa92e4ada4502a45f537c0fcb8"},{"url":"https://git.kernel.org/stable/c/cbb3310a5167e868a5e763e32b9a23b4d50669ee"},{"url":"https://git.kernel.org/stable/c/8577a5ec4f7e00443015ef99f646def093121a1b"},{"url":"https://git.kernel.org/stable/c/4448a539a0c39141cccc67be6cacde0f35024313"},{"url":"https://git.kernel.org/stable/c/fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77"},{"url":"https://git.kernel.org/stable/c/4aed7e47a10b94ea3c5171e8d1382081accd2e03"},{"url":"https://git.kernel.org/stable/c/dc750422170a563c7a81f6e49d36bb02c62ae37f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:17:53.321Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}