{"id":"CVE-2026-98365","summary":"RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access\n\nmr_check_range() validates that [iova, iova+length) falls within the\nregistered MR range using wraparound-prone arithmetic:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        iova + length \u003e mr-\u003eibmr.iova + mr-\u003eibmr.length)\n\nA remote peer can craft an RDMA-Write/Read RETH so that iova + length\nwraps to 0 (e.g. iova=0xfffffffffffffff8, length=8), bypassing the\ncheck. rxe_mr_iova_to_index() then computes a huge index (int idx, only\nguarded by WARN_ON) and rxe_mr_copy_xarray() dereferences\nmr-\u003epage_info[huge], causing an out-of-bounds read/write and a kernel\noops that is triggerable by an unauthenticated remote peer.\n\nRewrite the check in overflow-safe form; the first two clauses guarantee\nthat the subsequent subtractions do not underflow:\n\n    if (iova \u003c mr-\u003eibmr.iova ||\n        length \u003e mr-\u003eibmr.length ||\n        iova - mr-\u003eibmr.iova \u003e mr-\u003eibmr.length - length)\n\nWith the fix, mr_check_range() returns -EINVAL for the crafted iova and\nthe responder reports REMOTE_ACCESS_ERROR instead of triggering the OOB.","modified":"2026-10-07T02:47:30.596352375Z","published":"2026-10-06T08:46:50.834Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98365.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f3b705144e3a3c14184fec6e354680081fe91ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3431f525718f6b07da308cda6d44f8cb548bbd37"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d9426a74fc8cb8f375fcdc19b465a030f9b8cab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7d2118660545a00b21e83010ded1a231c6fb8c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d10e2a08799e858d3e71ea4169bcd018f216d444"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98365.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98365"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8700e3e7c4857d28ebaa824509934556da0b3e76"},{"fixed":"b7d2118660545a00b21e83010ded1a231c6fb8c5"},{"fixed":"5d9426a74fc8cb8f375fcdc19b465a030f9b8cab"},{"fixed":"2f3b705144e3a3c14184fec6e354680081fe91ec"},{"fixed":"3431f525718f6b07da308cda6d44f8cb548bbd37"},{"fixed":"d10e2a08799e858d3e71ea4169bcd018f216d444"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98365.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.54"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98365.json"}}],"schema_version":"1.9.0"}