{"id":"CVE-2026-90423","summary":"RDMA/rxe: Fix UAF in ODP init error-handling path","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix UAF in ODP init error-handling path\n\nrxe_odp_mr_init_user() stores &umem_odp-\u003eumem in mr-\u003eumem before\ncalling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,\nrxe_odp_mr_init_user() releases umem_odp and returns an error.\n\nrxe_reg_user_mr() then unwinds the error through rxe_cleanup(),\nrxe_mr_cleanup(), ib_umem_release(mr-\u003eumem). There is an\nIS_ERR_OR_NULL(umem) check at the start of ib_umem_release().\nBut since mr-\u003eumem is NOT reset to NULL in the error handling\npath of rxe_odp_mr_init_user(), the check passes and it reads\nalready-freed fields like umem-\u003eis_dmabuf, causing UAF.\n\nFix the UAF by clearing mr-\u003eumem after releasing the failed\nODP umem so the MR cleanup path does not release it again.","modified":"2026-09-19T03:47:31.057338396Z","published":"2026-09-17T16:09:46.513Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90423.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90423.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90423"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91"},{"fixed":"5f1933163327c9f1c8f2a341c6cb551aaf231ff9"},{"fixed":"4cfb448705da3171d44d9cbe7be53ff03284d532"},{"fixed":"51f2c8d2c99fc1f452f7113c08a35edcc4bf8732"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90423.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90423.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}