{"id":"CVE-2025-21876","revision":null,"records":[{"revision":"5ad62cb432664f9daae7437379bcc55a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21876","aliases":[],"title":"iommu/vt-d: Fix suspicious RCU usage","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Fix suspicious RCU usage\n\nCommit (\"iommu/vt-d: Allocate DMAR fault interrupts\nlocally\") moved the call to enable_drhd_fault_handling() to a code\npath that does not hold any lock while traversing the drhd list. Fix\nit by ensuring the dmar_global_lock lock is held when traversing the\ndrhd list.\n\nWithout this fix, the following warning is triggered:\n =============================\n WARNING: suspicious RCU usage\n 6.14.0-rc3 #55 Not tainted\n -----------------------------\n drivers/iommu/intel/dmar.c:2046 RCU-list traversed in non-reader section!!\n other info that might help us debug this:\n rcu_scheduler_active = 1, debug_locks = 1\n 2 locks held by cpuhp/1/23:\n #0: ffffffff84a67c50 (cpu_hotplug_lock){++++}-{0:0}, at: cpuhp_thread_fun+0x87/0x2c0\n #1: ffffffff84a6a380 (cpuhp_state-up){+.+.}-{0:0}, at: cpuhp_thread_fun+0x87/0x2c0\n stack backtrace:\n CPU: 1 UID: 0 PID: 23 Comm: cpuhp/1 Not tainted 6.14.0-rc3 #55\n Call Trace:\n \n dump_stack_lvl+0xb7/0xd0\n lockdep_rcu_suspicious+0x159/0x1f0\n ? __pfx_enable_drhd_fault_handling+0x10/0x10\n enable_drhd_fault_handling+0x151/0x180\n cpuhp_invoke_callback+0x1df/0x990\n cpuhp_thread_fun+0x1ea/0x2c0\n smpboot_thread_fn+0x1f5/0x2e0\n ? __pfx_smpboot_thread_fn+0x10/0x10\n kthread+0x12a/0x2d0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x4a/0x60\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \n\nHolding the lock in enable_drhd_fault_handling() triggers a lockdep splat\nabout a possible deadlock between dmar_global_lock and cpu_hotplug_lock.\nThis is avoided by not holding dmar_global_lock when calling\niommu_device_register(), which initiates the device probe process.","state":0,"publishedAt":"2025-03-27T14:57:06.802+00:00","modifiedAt":"2026-10-15T21:51:54.56+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/iommu/intel/dmar.c\",\n \"drivers/iommu/intel/iommu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"d74169ceb0d2e32438946a2f1f9fc8c803304bd6\",\n \"lessThan\": \"4117c72938493a77ab53cc4b8284be8fb6ec8065\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d74169ceb0d2e32438946a2f1f9fc8c803304bd6\",\n \"lessThan\": \"c603ccbe91d189849e1439134598ec567088dcec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d74169ceb0d2e32438946a2f1f9fc8c803304bd6\",\n \"lessThan\": \"b150654f74bf0df8e6a7936d5ec51400d9ec06d8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/iommu/intel/dmar.c\",\n \"drivers/iommu/intel/iommu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.18\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13.6\",\n \"lessThanOrEqual\": \"6.13.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/4117c72938493a77ab53cc4b8284be8fb6ec8065","https://git.kernel.org/stable/c/c603ccbe91d189849e1439134598ec567088dcec","https://git.kernel.org/stable/c/b150654f74bf0df8e6a7936d5ec51400d9ec06d8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21876","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21876","identifiers":["CVE-2025-21876"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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