{"id":"CVE-2026-90430","title":"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->lvcmdq…","summary":"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->lvcmdq…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 < 792f720fc23fe5bd6508d40ed73ae739debd6dcb","Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 < b4535b403d6bf9bcc24dbd62096711329b9c612c","Linux >= 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 < cbc41aacd49e695338940196e7084770365e1b68","Linux 6.12"],"published":"2026-09-17","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:29.013","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90430","references":[{"url":"https://git.kernel.org/stable/c/792f720fc23fe5bd6508d40ed73ae739debd6dcb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b4535b403d6bf9bcc24dbd62096711329b9c612c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cbc41aacd49e695338940196e7084770365e1b68","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5ec248ee1c79354979c23f7f390e856e9535651","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90430.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90430"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536410"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90430"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90430"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90430.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.002,"epssPercentile":0.09731,"ingestedAt":"2026-09-17T16:21:47.791Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"slug":"CVE-2026-90430","body":"## Overview\n\nIn 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.\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** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90430.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225475,"id":"CVE-2026-90430","ts":1792498263932,"field":"cvss","old":null,"new":"5.5"},{"seq":225474,"id":"CVE-2026-90430","ts":1792498263932,"field":"severity","old":"none","new":"medium"}]}