Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Remove redundant css_put() in scx_cgroup_init() The iterator css_for_each_descendant_pre() walks the cgroup hierarchy under cgroup_lock(). It does not increment the reference counts on yielded css structs. According to the cgroup documentation, css_put() should only be used to release a reference obtained via css_get() or css_tryget_online(). Since the iterator does not use either of these to acquire a reference, calling css_put() in the error path of scx_cgroup_init() causes a refcount underflow. Remove the unbalanced css_put() to prevent a potential Use-After-Free (UAF) vulnerability.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8195136669661fdfe54e9a8923c33b31c92fc1da before cc095cd305fddbe25a968e4a78436ff9476cf0f6; affected 8195136669661fdfe54e9a8923c33b31c92fc1da before 6eaaa67d6998f6c30c462b140db8c062e07ec473; affected 8195136669661fdfe54e9a8923c33b31c92fc1da before bf50f3285eda8a0173625fcdb5f183f96e1008cd; affected 8195136669661fdfe54e9a8923c33b31c92fc1da before 1336b579f6079fb8520be03624fcd9ba443c930b |
| Linux / Linux | affected 6.12; unaffected 0 before 6.12; unaffected 6.12.78 through 6.12.*; unaffected 6.18.19 through 6.18.*; unaffected 6.19.9 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.