CVE-2026-64033
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
In the Linux kernel RDMA/rtrs component, a use-after-free vulnerability was found in the error handling path of rtrs_srv_create_path_files(). Calling kobject_put() before destroying sysfs root folders can free memory that is later accessed, leading to a use-after-free condition.
Risk Assessment
This vulnerability may cause system crashes (kernel panic) or potentially privilege escalation if the error path is triggered intentionally. Organizations using RDMA/rtrs are at risk of system instability.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit in the mainline). Before updating, monitor systems for unusual crashes related to RDMA.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs: Fix use-after-free in path file creation cleanup In the error path of rtrs_srv_create_path_files(), the sysfs root folders may already have been created and srv_path->kobj may already have been initialized. If a later step fails, the cleanup currently calls kobject_put(&srv_path->kobj) before rtrs_srv_destroy_once_sysfs_root_folders(srv_path). kobject_put() may drop the last reference to srv_path->kobj and invoke the release callback, rtrs_srv_release(), which frees srv_path. The following call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then dereferences srv_path internally to access srv_path->srv, resulting in a use-after-free. This failure path is reached before rtrs_srv_create_path_files() returns success, so the successful-path lifetime handling is not involved. Fix this by destroying the sysfs root folders before calling kobject_put(&srv_path->kobj), so srv_path is still valid while the helper accesses it. This issue was found by a static analysis tool I am developing.