Linux Kernel: RDMA/rtrs sysfs UAF on path cleanup
CVE-2026-64033 Published on July 19, 2026
RDMA/rtrs: Fix use-after-free in path file creation cleanup
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.
Products Associated with CVE-2026-64033
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Affected Versions
Linux:- Version bab17b761c8974a869b04462be5d4dd9aad366b4 and below 01e42aabaf7632beb4bf235c7238b96c746d4144 is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below 548f3956e53a7f7bde912d8129010b8986d5e602 is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below 00904a73272b9f3ef3952fe69a833909dccad1ef is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below 92060ab1c5115674cf319175550f85f68405121f is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below eae62c5451e67e8b033c1681fd3b85d7e9a9a28f is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below b0e9706fb2859064bb6c677554c4d20c713aa8e0 is affected.
- Version ae4c81644e9105d9f7f713bb0d444737bb6a0cf1 and below 5b74373390113fba798a76b483837029ab010fef is affected.
- Version 5.15.61 and below 5.15.209 is affected.
- Version 5.17 is affected.
- Before 5.17 is unaffected.
- Version 5.15.209, <= 5.15.* is unaffected.
- Version 6.1.175, <= 6.1.* is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.