{"id":"CVE-2026-90430","revision":"49bbe615b05e4e89a7566fae3c9effa8","records":[{"revision":"49bbe615b05e4e89a7566fae3c9effa8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90430","aliases":[],"title":"iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized\n\ntegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to\nthe vintf->lvcmdqs[] array, before tegra241_vcmdq_alloc_smmu_cmdq() builds\nthe vcmdq->cmdq. The error ISR dereferences that cmdq, so a latched LVCMDQ\nerror (e.g. one inherited across a kexec) firing in this window would make\ntegra241_vintf0_handle_error() pass the still-zeroed arm_smmu_cmdq down to\n__arm_smmu_cmdq_skip_err(), dereferencing NULL queue register pointers.\n\nDrop the store from tegra241_vintf_init_lvcmdq() and publish the vcmdq at\nthe end of the allocation instead, with an smp_store_release() that pairs\nwith an smp_load_acquire() in the ISR, which can see a fully built LVCMDQ\nor NULL.\n\nThe user-owned LVCMDQ allocation moves accordingly, publishing the vcmdq\nonce tegra241_vcmdq_hw_init_user() succeeds, using a plain store since a\nuser VINTF's lvcmdqs[] has no lockless reader -- the error ISR only walks\nthe VINTF0 array.","state":0,"publishedAt":"2026-09-17T16:09:51.101+00:00","modifiedAt":"2026-10-19T09:03:33.781+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/arm/arm-smmu-v3/tegra241-cmdqv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"918eb5c856f6ce4cf93b4b38e4b5e156905c5943\",\n                            \"lessThan\": \"d5ec248ee1c79354979c23f7f390e856e9535651\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"918eb5c856f6ce4cf93b4b38e4b5e156905c5943\",\n                            \"lessThan\": \"792f720fc23fe5bd6508d40ed73ae739debd6dcb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"918eb5c856f6ce4cf93b4b38e4b5e156905c5943\",\n                            \"lessThan\": \"b4535b403d6bf9bcc24dbd62096711329b9c612c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"918eb5c856f6ce4cf93b4b38e4b5e156905c5943\",\n                            \"lessThan\": \"cbc41aacd49e695338940196e7084770365e1b68\",\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/arm/arm-smmu-v3/tegra241-cmdqv.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/d5ec248ee1c79354979c23f7f390e856e9535651","https://git.kernel.org/stable/c/792f720fc23fe5bd6508d40ed73ae739debd6dcb","https://git.kernel.org/stable/c/b4535b403d6bf9bcc24dbd62096711329b9c612c","https://git.kernel.org/stable/c/cbc41aacd49e695338940196e7084770365e1b68"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90430","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90430","identifiers":["CVE-2026-90430"]},"retained":false,"historicalAffected":[]}],"coverage":[]}