{"id":"CVE-2026-90423","title":"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->umem in mr->umem before\ncalling rxe_odp_init_pages()","summary":"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->umem in mr->umem before\ncalling rxe_odp_init_pages(). If rxe_odp_init_pages(…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 < 5f1933163327c9f1c8f2a341c6cb551aaf231ff9","Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 < 4cfb448705da3171d44d9cbe7be53ff03284d532","Linux >= d03fb5c6599e31b90c6b5f65d43d6ccc6b49eb91 < 51f2c8d2c99fc1f452f7113c08a35edcc4bf8732","Linux 6.15"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:58.663","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90423","references":[{"url":"https://git.kernel.org/stable/c/4cfb448705da3171d44d9cbe7be53ff03284d532","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/51f2c8d2c99fc1f452f7113c08a35edcc4bf8732","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5f1933163327c9f1c8f2a341c6cb551aaf231ff9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00127,"epssPercentile":0.02716,"ingestedAt":"2026-09-17T16:21:47.793Z","slug":"CVE-2026-90423","body":"## Overview\n\nIn 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->umem in mr->umem 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->umem). There is an\nIS_ERR_OR_NULL(umem) check at the start of ib_umem_release().\nBut since mr->umem 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->is_dmabuf, causing UAF.\n\nFix the UAF by clearing mr->umem after releasing the failed\nODP umem so the MR cleanup path does not release it again.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207317,"id":"CVE-2026-90423","ts":1789757340760,"field":"cvss","old":null,"new":"7.8"},{"seq":207316,"id":"CVE-2026-90423","ts":1789757340760,"field":"severity","old":"none","new":"high"}]}