{"id":"CVE-2026-90430","state":"PUBLISHED","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.","publishedAt":"2026-09-17T16:09:51.101Z","updatedAt":"2026-10-19T09:03:33.781Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"d5ec248ee1c79354979c23f7f390e856e9535651","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"792f720fc23fe5bd6508d40ed73ae739debd6dcb","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"b4535b403d6bf9bcc24dbd62096711329b9c612c","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"cbc41aacd49e695338940196e7084770365e1b68","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90430.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90430","state":"PUBLISHED","datePublished":"2026-09-17T16:09:51.101Z","dateUpdated":"2026-10-19T09:03:33.781Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.815Z"},"containers":{"cna":{"title":"iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"d5ec248ee1c79354979c23f7f390e856e9535651","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"792f720fc23fe5bd6508d40ed73ae739debd6dcb","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"b4535b403d6bf9bcc24dbd62096711329b9c612c","versionType":"git"},{"version":"918eb5c856f6ce4cf93b4b38e4b5e156905c5943","status":"affected","lessThan":"cbc41aacd49e695338940196e7084770365e1b68","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d5ec248ee1c79354979c23f7f390e856e9535651"},{"url":"https://git.kernel.org/stable/c/792f720fc23fe5bd6508d40ed73ae739debd6dcb"},{"url":"https://git.kernel.org/stable/c/b4535b403d6bf9bcc24dbd62096711329b9c612c"},{"url":"https://git.kernel.org/stable/c/cbc41aacd49e695338940196e7084770365e1b68"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:03:33.781Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}