{"id":"CVE-2026-89451","title":"iommu/sva: Set handle->dev before the SVA handle is visible","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Set handle->dev before the SVA handle is visible\n\niommu_attach_device_pasid() installs the new SVA attach handle in the\ngroup PASID lookup before iommu_sva_b…","severity":"medium","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"],"vendor":"Linux","product":"Linux","affected":["Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < c4c71368bc5c5b3840590d39b4cfa12d733cadf4","Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < bcffb1c75da8fc9d51168ff9f09d471c26507912","Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 968e9a1f71140c86dc4092f6b361e997923f3813","Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 37a96a30617a4c96f048a5874c00509bc4fe4d85","Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 530f8f9c3546cb3ebee1b135375aaee08a073ebb","Linux 6.2"],"published":"2026-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:47:29.668Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89451","references":[{"url":"https://git.kernel.org/stable/c/c4c71368bc5c5b3840590d39b4cfa12d733cadf4"},{"url":"https://git.kernel.org/stable/c/bcffb1c75da8fc9d51168ff9f09d471c26507912"},{"url":"https://git.kernel.org/stable/c/968e9a1f71140c86dc4092f6b361e997923f3813"},{"url":"https://git.kernel.org/stable/c/37a96a30617a4c96f048a5874c00509bc4fe4d85"},{"url":"https://git.kernel.org/stable/c/530f8f9c3546cb3ebee1b135375aaee08a073ebb"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89451.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89451"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532460"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89451"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89451"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89451.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.1059,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-89451","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Set handle->dev before the SVA handle is visible\n\niommu_attach_device_pasid() installs the new SVA attach handle in the\ngroup PASID lookup before iommu_sva_bind_device() returns. A concurrent\nbind can therefore find and reuse the same handle after iommu_sva_lock is\ndropped.\n\nhandle->dev was initialized after dropping iommu_sva_lock. This leaves a\nwindow where a racing bind can return a handle whose dev pointer is still\nNULL. A subsequent iommu_sva_unbind_device() can then dereference it via\nhandle->dev->iommu_group.\n\nInitialize handle->dev before releasing iommu_sva_lock so any visible SVA\nhandle is fully initialized.\n\n## Affected\n\n- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < c4c71368bc5c5b3840590d39b4cfa12d733cadf4`\n- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < bcffb1c75da8fc9d51168ff9f09d471c26507912`\n- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 968e9a1f71140c86dc4092f6b361e997923f3813`\n- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 37a96a30617a4c96f048a5874c00509bc4fe4d85`\n- `Linux >= be51b1d6bbff48c7d1943a8ff1e5a55777807f6e < 530f8f9c3546cb3ebee1b135375aaee08a073ebb`\n- `Linux 6.2`\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 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 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89451.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206994,"id":"CVE-2026-89451","ts":1789749735944,"field":"cvss","old":"4.1","new":"5.5"},{"seq":203957,"id":"CVE-2026-89451","ts":1789490230794,"field":"cvss","old":null,"new":"4.1"},{"seq":203956,"id":"CVE-2026-89451","ts":1789490230794,"field":"severity","old":"none","new":"medium"},{"seq":147159,"id":"CVE-2026-89451","ts":1789270197762,"field":"cvss","old":null,"new":"4.1"},{"seq":147158,"id":"CVE-2026-89451","ts":1789270197762,"field":"severity","old":"none","new":"medium"},{"seq":108918,"id":"CVE-2026-89451","ts":1789183729535,"field":"cvss","old":null,"new":"4.1"},{"seq":108917,"id":"CVE-2026-89451","ts":1789183729535,"field":"severity","old":"none","new":"medium"}]}