{"id":"CVE-2026-89506","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that ca…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that ca…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 5b2e45049dc06a876bc6b138218ddeb0814502ef < 71d5c41ac583df09a7c32199bef7d42de7267d07","Linux >= 5b2e45049dc06a876bc6b138218ddeb0814502ef < 9e71d0f4944ba5641e01db29b3256c963656d671","Linux >= 5b2e45049dc06a876bc6b138218ddeb0814502ef < 011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf","Linux 6.17"],"published":"2026-09-11","updated":"2026-09-11","sourceUpdated":"2026-09-11T20:19:32.917","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89506","references":[{"url":"https://git.kernel.org/stable/c/011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/71d5c41ac583df09a7c32199bef7d42de7267d07","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9e71d0f4944ba5641e01db29b3256c963656d671","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89506.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89506"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532195"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89506"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89506"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89506.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-14T13:03:22.755Z","epss":0.00166,"epssPercentile":0.06253,"cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"slug":"CVE-2026-89506","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that cannot be passed through the ioctl. They\nalso assume that the udata cannot be NULL, so failing to pass a valid\nudata can trigger a NULL udata crash in those drivers.\n\nThis never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex()\ndoes not accept a udata and those three drivers don't use it, however a\nmalicious userspace could trigger it.\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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89506.json)","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204075,"id":"CVE-2026-89506","ts":1789490231323,"field":"cvss","old":null,"new":"4.7"},{"seq":204074,"id":"CVE-2026-89506","ts":1789490231323,"field":"severity","old":"none","new":"medium"},{"seq":147630,"id":"CVE-2026-89506","ts":1789270211662,"field":"cvss","old":null,"new":"4.7"},{"seq":147629,"id":"CVE-2026-89506","ts":1789270211662,"field":"severity","old":"none","new":"medium"},{"seq":109384,"id":"CVE-2026-89506","ts":1789183731697,"field":"cvss","old":null,"new":"4.7"},{"seq":109383,"id":"CVE-2026-89506","ts":1789183731697,"field":"severity","old":"none","new":"medium"}]}