{"id":"CVE-2026-98342","title":"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()","summary":"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…","severity":"high","vendor":"Linux","product":"Linux","affected":["Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < ac8ce9f89638d6d79875cca7d8ae42566a9bde15","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < 14578c78405d51fa92e4ada4502a45f537c0fcb8","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < cbb3310a5167e868a5e763e32b9a23b4d50669ee","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < 8577a5ec4f7e00443015ef99f646def093121a1b","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < 4448a539a0c39141cccc67be6cacde0f35024313","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < 4aed7e47a10b94ea3c5171e8d1382081accd2e03","Linux >= 2ba05622b8b143b0c95968ba59bddfbd6d2f2559 < dc750422170a563c7a81f6e49d36bb02c62ae37f","Linux 2.6.29"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:27.003","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98342","references":[{"url":"https://git.kernel.org/stable/c/14578c78405d51fa92e4ada4502a45f537c0fcb8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4448a539a0c39141cccc67be6cacde0f35024313","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4aed7e47a10b94ea3c5171e8d1382081accd2e03","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8577a5ec4f7e00443015ef99f646def093121a1b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ac8ce9f89638d6d79875cca7d8ae42566a9bde15","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cbb3310a5167e868a5e763e32b9a23b4d50669ee","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc750422170a563c7a81f6e49d36bb02c62ae37f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc1f4884f1d46fc7a8cee6e2997ecc9e8d1c7f77","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98342.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98342"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546335"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98342"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98342"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98342.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-06T08:50:17.399Z","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-825"],"epss":0.00177,"epssPercentile":0.07161,"slug":"CVE-2026-98342","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98342.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":219135,"id":"CVE-2026-98342","ts":1791707071027,"field":"cvss","old":null,"new":"7"},{"seq":219134,"id":"CVE-2026-98342","ts":1791707071027,"field":"severity","old":"none","new":"high"}]}